hybridfree/eevblog-posts huggingface dataset:
FLED-based solar engines - Page 1
Forum section: electronics / beginners

author: Lucky-Luka
author_rank: Unknown
timestamp: January 01, 2022, 09:56:05 am
content: Hi allLooking into BEAM circuits I have seen the use of the FLEDs (flashing LEDs).http://solarbotics.net/library/circuits/se_t1_fled.htmlAre they different from common LEDs and why should I use them?Can I buy them somewhere nowadays or could I use something else?Thanks

author: Kleinstein
author_rank: Super Contributor
timestamp: January 01, 2022, 01:00:50 pm
content: The circuit seems to use the LED as a kind of trigger circuit, to start the active operation when the required voltage is reached. A flashing LED may do the trick (but not all types may behave the same), but there are alternative circuits, e.g. using a suitabe low leakage zener or a voltage supervisor chip. Modern electronics is often quite low in power compared to the motor.

author: tszaboo
author_rank: Super Contributor
timestamp: January 01, 2022, 01:27:02 pm
content: I dont remember seeing flashing LEDs in the last ~15 years or so. It was used in a bunch of circuits as a simple low frequency sqare wave generators.

author: Lucky-Luka
author_rank: Unknown
timestamp: January 01, 2022, 01:55:28 pm
content: So do you think other components can do its function in this circuit?

author: tszaboo
author_rank: Super Contributor
timestamp: January 01, 2022, 11:08:55 pm
content: a 555 timer

author: SeanB
author_rank: Super Contributor
timestamp: January 02, 2022, 12:15:15 pm
content: Flashing LED's are still available off the shelf.https://www.mantech.co.za/Datasheets/Products/WW05A7SRSGC4-2.4.pdfDatasheet for one

author: Lucky-Luka
author_rank: Unknown
timestamp: January 02, 2022, 12:19:15 pm
content: Is there a way to vary the frequency of the blinking?

author: rpiloverbd
author_rank: Regular Contributor
timestamp: January 02, 2022, 03:58:50 pm
content: I bought some flashing LEDs in 2018. As far as I can remember, my supplier, sourced those from alliexpress.https://ja.aliexpress.com/item/32799108713.htmlFlashing LEDs look like any normal LED. They are powered in the same way as regular LEDs. The only difference is, they flash automatically. I used those for the electronic candle project. Now, coming to your mentioned project 'FLED-based solar engines', the article is not very clear to understand. Looks like they are continuously switching on and off the transistors.

author: Terry Bites
author_rank: Super Contributor
timestamp: January 03, 2022, 06:02:20 pm
content: Noooooooooooooooooooooooooooooooooooooooh!
FlexBV - Page 1
Forum section: electronics / beginners

author: u666sa
author_rank: Frequent Contributor
timestamp: December 08, 2023, 08:48:54 am
content: Who actually bought and has the latest paid version? Was it worth it?

author: liaifat85
author_rank: Regular Contributor
timestamp: December 09, 2023, 12:13:10 pm
content: Here I found just a very few reviews on FlexBV:https://boards.rossmanngroup.com/threads/flexbv-vs-xinzhizao-vs.61720/

author: u666sa
author_rank: Frequent Contributor
timestamp: December 10, 2023, 04:43:41 am
content: Not bad. But I would really like to speak with a paid user of FlexBV.
FlexRay signalling problem - Page 1
Forum section: electronics / beginners

author: lowpy
author_rank: Newbie
timestamp: February 13, 2019, 04:30:01 pm
content: Please help me figure out the cause for the bad signalling behavior of FlexRay transceivers on an embedded development platform. Before describing the problem below I want to mention that I am a beginner in electronics (but willing to learn more).I am generating test input for the FlexRay transceiver (TJA1080 and AS8221) by holding the Tx line always low and toggling the TxEN line. This should generate a succession of dominant (Data_0) and recessive (Idle) levels. The result is visible in the attached image (FlexRay_output.png). While the two lines (Bus Plus and Bus minus) follow the prescribed input, all transitions from dominant to recessive (low to high transitions in the BP-BM plot) exhibit a pretty large set of overshoots/undershoots which are interpreted by receiving transceivers as actual bit transitions (Rx signal in the attached figure).The problem is present with both transceivers that come with the TriBoard development boards which I am using for these tests. I tried doing the same on a completely different board equipped with the TJA1080 and the result is correct not as seen on the TriBoards. The only notable difference I can notice between the two cases is that TriBoards use 3V3 for digital interfacing with the transceiver instead of 5V (but this is supported by the transceiver and the IO reference voltage is correctly connected) and the bus termination circuit which has some additional filtering (I think) capacitors on the working board.I am also attaching the schematic for the transceiver connection in case it helps.Any thoughts are welcomed.Thanks in advance!

author: max_torque
author_rank: Super Contributor
timestamp: February 13, 2019, 09:49:20 pm
content: 2 questions:1) do both boards have a common ground2) Do you have the bus termination resistors connected (R316 R317 & R318)

author: lowpy
author_rank: Newbie
timestamp: February 14, 2019, 05:17:14 am
content: The answer is yes to both questions.I also double checked the values of the termination circuit resistors and they match the schematic.
Flickering SMD LED - Page 1
Forum section: electronics / beginners

author: hedeon
author_rank: Newbie
timestamp: February 03, 2024, 09:39:28 pm
content: Hi,I am a complete amateur, and I hope this is the right place to ask this question. In my next project, I would like to use a flickering SMD LED. Something like LED’s used in tea lights, that imitate candle light but in small SMD package. There are a lot of options for through-hole 5mm and 3mm LEDs, but I struggle to find SMD counterparts. Does such a thing exist? Can someone point me in the right direction? For simplicity’s sake, I would prefer it to be a “self-flickering” LED, as I don’t know how to build my flickering circuitry.

author: Jwillis
author_rank: Super Contributor
timestamp: February 03, 2024, 11:23:24 pm
content: Something like these?Flickering LED

author: hedeon
author_rank: Newbie
timestamp: February 05, 2024, 02:33:06 am
content: Exactly, just in a SMD package.

author: themadhippy
author_rank: Super Contributor
timestamp: February 05, 2024, 03:57:15 am
content: Quoteput a flickering led in series with your static smd led

author: Jwillis
author_rank: Super Contributor
timestamp: February 05, 2024, 05:15:39 am
content: Quote from: hedeon on February 05, 2024, 02:33:06 amhttps://hdamodelworx.com/0805-FLICKER-YELLOW-SMD-5-PACK-Pre-Wired-with-Resistors-and-Lead-Wires-_p_609.htmlSeems 0805 Package exists. Not sure where to get without the resistor and wires.

author: abeyer
author_rank: Frequent Contributor
timestamp: February 05, 2024, 09:44:32 am
content: I've seen them here and there, mostly on import sites, but never anyone I know of as a reputable distributor.https://lighthouseleds.com/0807-flickering-candle-flicker-led-smd-yellow-gold-ultra-bright.htmlhas them listed and seems to first sniff to be legitimate, but never heard of them before.
Flip flop inverter... - Page 1
Forum section: electronics / beginners

author: cowasaki
author_rank: Frequent Contributor
timestamp: June 10, 2018, 07:28:40 pm
content: Is there a simple circuit that takes a pulse input (either ground or VCC) and causes a flip flop to flop and then the same input again to flop again ie no reset but still have Q and inverted Q outputs. This would be for a button to invert the outputs (so hardware debounce would be helpful too) and having Q and inverted Q means you could attach to the relevant one in order to select the correct default condition.

author: karkoon
author_rank: Contributor
timestamp: June 11, 2018, 02:28:01 am
content: You can make a toggle switch using 555 timer and a few passive components.A quick google should set you with many options of this design. If you need a quick reference here you gohttp://www.buildcircuit.com/toggle-switch/There was also a video by Dave to make a soft toggle switch using just transistors.Sent from my iPhone using Tapatalk

author: Benta
author_rank: Super Contributor
timestamp: June 11, 2018, 11:08:13 am
content: Quote from: cowasaki on June 10, 2018, 07:28:40 pmIt's called a T-flipflop (for toggle) and is built using a JK-flipflop, eg, 4027.

author: TomS_
author_rank: Frequent Contributor
timestamp: June 11, 2018, 12:27:47 pm
content: I think you can do the same with a 74HC74 which has a pair of D type flip flops in it.Take the output of Q complement and feed it to the D input. Hook a debounced button up to the clock pin, tie reset and preset high, and I think thats about it.

author: Benta
author_rank: Super Contributor
timestamp: June 11, 2018, 01:11:11 pm
content: Yeah, a D-flipflop will work as well like you describe it. I'm just used to JKs, as they are more versatile.
Flip Flop Stuck? - Page 1
Forum section: electronics / beginners

author: Knappster
author_rank: Newbie
timestamp: July 08, 2010, 12:39:25 am
content: First I'll paint the picture. I have a circuit design to control a motor for an airsoft gearbox here:http://openairsoft.net/stuff/SW-AB-LONG-SCH.pngThis works as intended however I have a need to replace the current switch mechanism inside the gearbox. In semi auto mode, as the trigger switch is closed a lever connected to the gear train kicks the closed switch open after one cycle of the gearbox and therefore kills power to the motor. I'm looking to replace this switch mechanism with a PCB containing SMD switches like in this video:They achieve control through the use of a PIC microcontroller, I'd like to replace that micro with something a lot simpler and a lot cheaper. Basically I'm looking for a device that has 2 inputs and 1 output. Input 1 (Trigger) causes the output to go high and when input 2 (cut off) is momentarily high the output changes state to low and stays low until input 1 cycles from low to high again.Someone pointed me in the direction of basic flip-flops but I can't get them to do my bidding. I hope I've explained things clearly :$. The answer is probably very simple but I'm too blind to see it.

author: Zero999
author_rank: Super Contributor
timestamp: July 08, 2010, 01:35:02 am
content: Just use an RS flip-flop.Output = QSet = Input 1 (trigger)Reset = Input 2 (cut-off)When the trigger goes from low to high, the output will go high and when the reset goes from low to high, the output will go low.There are plenty of ways to do this from logic gates to a couple of transistors. I'd recommend using a flip-flop IC such as the CD4013 or 74HC74

author: Knappster
author_rank: Newbie
timestamp: July 08, 2010, 08:59:03 am
content: I knew it was simple. I found that I need a package that triggers on the positive rising edge only which is why I couldn't get my logical models to work :$. Thanks for the help.

author: Zero999
author_rank: Super Contributor
timestamp: July 08, 2010, 09:27:18 am
content: The devices I suggested are positive edge triggered, if you need negative edge triggering, you could use a 555 timer or make a flip-flop from NAND gates e.g. the CD4011 or 74HC00.
flip flop switch to control mosfet  - Page 1
Forum section: electronics / beginners

author: mika
author_rank: Newbie
timestamp: November 13, 2016, 01:06:00 am
content: Hi im traing to do one flip flop, and i view the video from eevblog,https://www.youtube.com/watch?v=Foc9R0dC2iI&feature=youtu.be,the circuit that im interesting appears in minute 13:03.The caracteristics how i need are not auto-turn on when conect the power and the delay to turn off.if i understand this delay is produced for the low voltage 3v?circuit i seeits posible to controle with this circuit a mosfet like a switch ? i tell a mosfet because i need the memory from the mosfet only 5,7 seconds in case that the power disconected after the mosfet would have to restart.thanks for all.

author: Paul Price
author_rank: Super Contributor
timestamp: November 13, 2016, 03:40:53 am
content: No.This circuit will not give you a delay in turning off the power.The circuit you show will instantly begin to turn off power by holding pressed the on/off momentary contact switch if the P-channel MOSFET switch has already been turned on power by a previous switch press.You might do much better to get the accurate turn-off delay that you want using a CMOS 4013 Dual D Flip-Flop. You would only need one of the two flip flops.You would still use capacitors and resistors to create charging delays on the Set pin and Clock pin and you could also use the D input pin to make your Power On/OFF switch.The NOT Q output of the 4013 flip-fop would still connect to a P-Channel MOSFET acting as the Power Switch to turn On/Off power.You could do all this using just one switch to toggle on/off, just like as with the circuit you show.The NOT Q or Q output of the 4013 flip-flop can be connected to the gate of a P-Channel power switch to control Power On or Off.

author: mika
author_rank: Newbie
timestamp: November 13, 2016, 10:07:54 am
content: Sorry paul,i explain bad, i not need a delay, i need, the effect holding pressed the on/off button to turn off.The time of holding pressed 5-7 seconds.How i can regulate the time holding pressed button? changing the capacitor?i do that athis schematic with 4130, but i havent got , the effect to holding pressed button to turn off onlyin that diagram if i chgange the relay for a p mosfet, if i disconected the power supply,how i can reset the memory of the mosfet with 5-7 after disconected?thnaks for your help.
FlipFlop via WinCUPL and GAL - Page 1
Forum section: electronics / beginners

author: banedon
author_rank: Regular Contributor
timestamp: March 29, 2015, 03:15:06 pm
content: Hi guysDoes anyone program GALs and have some experience with WinCUPL?I've recently purchased a Genius G540 programmer for my sins (anyone who has one probably knows what I mean!) and am experimenting with WinCUPL.I'm trying to create an internal D flip flop and am running into some odd errors. For some reason it doesn't like me setting an output pin to 0 or False.Here's my code:Code:/** Inputs*/Pin 2 = d; // Data outPin 3 = ck; // Clock out/** Outputs*/Pin 23 = q; // Q outPin 22 = nq; // /Q out/** Main*/// AND gate stuffand1a = !d;and1b = ck;and2a = d;and2b = ck;// set some values for Q so that the GAL can output somethingq1 = 0; // <--- error is found herenq1 = 0; // <--- error is found herenor1a = and1a & and1b;nor1b = q1;nor2a = and2a & and2b;nor2b = nq1;// now set the actual output of Q via the NAND gatesq2 = !(nor1a # nor1b);nq2 = !(nor2a # nor2b);nor1a2 = and1a & and1b;nor1b2 = q2;nor2a2 = and2a & and2b;nor2b2 = nq2;q = !(nor1a2 # nor1b2);nq = !(nor2a2 # nor2b2);When I try and compile the above code, it says:Invalid Syntax: 0and points to the '1' in 'q1'It does the same with 'nq1'The lines that generate this error are:q1 = 0;nq1 = 0;I've bolded the two lines which generate these errors.
Flir 4 msx problem - Page 1
Forum section: electronics / beginners

author: p38vtol
author_rank: Newbie
timestamp: April 07, 2018, 12:29:46 pm
content: Couple days ago I got a Flir 4 that was updated to an 8 and noticed the msx image was above the regular thermal image, is this a manufacturing defect or software problem, can I reset the cam without losing the flir 8 updates?I've pulled the battery and and replugged in that didn't help.I contacted the seller and after not fixing the distance problem it had, was talked through a factory reset and everything is great again.
flir camera live feed to smartphone  - Page 1
Forum section: electronics / beginners

author: leoibb
author_rank: Contributor
timestamp: January 24, 2015, 03:25:23 pm
content: Can anyone tell me if some dongle can be plugged in to flir e4 camera and send live feed to smartphone iPad . I know it can be done on pc with jab lead but I can't see the point in that so I would like to view on tablet if possible wired but ideally wireless ?

author: leoibb
author_rank: Contributor
timestamp: January 26, 2015, 03:45:43 pm
content: Someone must know,the,answer come on
Flir E4 Settings - Page 1
Forum section: electronics / beginners

author: rivee
author_rank: Newbie
timestamp: August 24, 2014, 09:13:33 am
content: I recently purchased a Flir E4 thermal imaging camera with the 1.22 software installed. I applied the E4 to E8 mods with great success.I bought the E4 for finding lost or injured cattle on the open range. The landscape is dry rolling hills with tall dry grass and other foliage on it. The summer temps can reach 100F with the rest of the year at around 70-85 F.I have tried it on cows that I can see in the open but with the daytime temps hovering around 95-100F it's hard to distinguish them from tree trunks and rocks etc.The question I have is what settings I should use with the new software to maximize my success in differentiating between the two?I know it would be better at night or during colder periods, but don't always have the luxury to do so.Any help would be greatly appreciated.

author: charlespax
author_rank: Regular Contributor
timestamp: August 25, 2014, 05:23:38 pm
content: Consider using a fixed temperature scale rather than the automatically changing one. This will stop your view from being interrupted while is recalibrating.Try using the temperature thresholding. The device will highlight either anything above the threshhold temperature or anything below the threshold temperature. When the ambient temperature is low you can highlight your warmer cows. When the ambient temperature is high you can highlight your cooler cows.If the air is the same temperature as your cows you probably will not be able to detect them very well.

author: rivee
author_rank: Newbie
timestamp: August 25, 2014, 08:20:24 pm
content: Thanks Charlespax

author: rivee
author_rank: Newbie
timestamp: September 07, 2014, 07:55:00 am
content: .
Flir E95 file transfer over wifi - Page 1
Forum section: electronics / beginners

author: as-if
author_rank: Newbie
timestamp: February 22, 2023, 09:01:42 am
content: Hi,I am new to this blog, so sorry for my mistakes beforehand.I am looking for a help regarding the Flir E95 Thermal imaging camera. Is there any way to receive files from Camera to Windows PC wirelessly (over WiFi)?I have already tested Flir Ignite Cloud Sync. It is not what I am looking for. I need something P2P, like for example FTP or SFTP over WiFi.The FW on the camera is the latest one (FLIR Exx (2017 & 2020) Update Pack 7.27.81).Thanks in advance.Regards,Asif M.

author: m k
author_rank: Super Contributor
timestamp: February 26, 2023, 04:24:47 pm
content: Correct acronym is RTSP, Real Time Streaming Protocol.You configure the camera being an access point and then access it with RTSP something.Or you connect it to other access point and being a part of a bigger network.In both cases the camera has an IP address.

author: Bud
author_rank: Super Contributor
timestamp: February 27, 2023, 06:36:07 am
content: E4 cameras have configuration setting to work as an FTP client periodically taking pictures and uploading to the configured remote FTP server, but nobody have tried that feature.

author: as-if
author_rank: Newbie
timestamp: November 19, 2023, 05:37:26 am
content: Hi,Many thanks to all who replied. I was having a health issue, that is why had to pause for a while. So, sorry for delaied reply.I will try the suggested solutions.Regards,Asif M.
Flir HS-307 HS-324 thermal Imager H series disc to set time stamp - Page 1
Forum section: electronics / beginners

author: Technosal
author_rank: Newbie
timestamp: November 20, 2024, 09:08:03 pm
content: Hello all I need some help. I just repaired a Flir HS-307 it had a bad micro display, bad clock battery and I could not locate a hot shoe for it so I did some mods to it and installed power and video out jacks on the top to power it externally and get video out without the hot shoe, see pics. My unit has firmware version 3.07. I need the H series disc that comes with these to set the timestamp does anybody have this disc and can you please put it up on cloud share or something similar so I and many others with the same problem can set our clocks? If so please include a link on here. The hs series disc or hm series disc should work the firmware should be the same. Also if anybody has the firmware 3.09 please put it up these are really nice thermal imagers and we all want to set our clocks and update, please help.Best RegardsSal
FLIR One Gen 3 ITAR Restrictions - Page 1
Forum section: electronics / beginners

author: mayurrumal1
author_rank: Newbie
timestamp: October 18, 2021, 11:38:59 pm
content: Hello, I'm curious if the FLIR One Gen 3 camera which is an Un-Cooled Thermal Video Camera with a Video Frame Rate of 8.7Hz (Less than 9Hz) is subject to ITAR export limitations.Thank you to whoever clarifies my doubt.

author: ejeffrey
author_rank: Super Contributor
timestamp: October 19, 2021, 03:31:32 am
content: Huh:https://www.eevblog.com/forum/thermal-imaging/u-s-itar-regulations-flir-pm695/Anyway, I don't know. If you want to buy one, the best way is to find a local authorized distributor so that you are not involved in exporting (although deemed exports are a thing). They should know and have completed whatever paperwork is needed. If you are trying to sell them, or want to buy them in the US and ship them internationally then you will also need an export lawyer.As near as I can tell, such cameras are ITAR listed, but they are allowed to be sold to most countries except for a few. But I don't know what documentation/paperwork is needed or advised when doing so.

author: m98
author_rank: Frequent Contributor
timestamp: October 19, 2021, 10:53:09 am
content: Also, just as a general advise, don't buy a FLIR One. We have a few FLIR One Pro Gen 3 at work, the user experience and hardware compatibility can be described as ... intentionally infuriating.I'd recommend the Thermal Expert Q1.
FLIR  Rrepair required.  - Page 1
Forum section: electronics / beginners

author: richiewelsh
author_rank: Newbie
timestamp: February 27, 2021, 06:36:40 am
content: Can anyone repair my FLIR i7.I accidentaly plugged the wrong charger in and seem to have blown the charger circuit.Everything works fine besides it wont charge the battery.I contacted Fraser on here who has been very helpful and he kindly explained this fault."You have damaged the power management IC that sits between the external power input, battery and camera electronics. The TVS input protection diode is also likely to have been activated. This is a relatively common occupancy on these cameras. The repair requires hot air reworking due to the power management IC’s case format and it is not a simple task due to the small size of the IC. The good news is that the IC is commonly available and not expensive."If anyone can repair this for me then please get in touch,thanks Richie...
Flir Tau 2 Infrared Camera Issue - Page 1
Forum section: electronics / beginners

author: ixiu
author_rank: Contributor
timestamp: January 15, 2018, 11:46:34 pm
content: I have a Flir core Tau 2 camera that I connect to a laptop via USB. I use the Flir Controller GUI to take snapshots and I encounter the following error when i try to retrieve and view snapshots that i have taken.Additional info:Windows 10 machineSnapshots taken can only be viewed through the GUI, they are not on the SD card (when i look used SD card reader).The software works fine on windows 7.Under properties option on the windows 10 machine you can run the software in Windows 7 compatibility mode but it comes up with the same error.The Flir tau 2 is not compatible with any other FLir software on their website. However there are 3rd party software it is compatible with, but i am yet to find any.Snapshot taken files can only be saved in .jpeg format and that choice is not available until the image is retrieved which is where this error occurs.any help would be helpfulThanks

author: Signal32
author_rank: Frequent Contributor
timestamp: January 16, 2018, 02:46:06 am
content: I'm guessing that the software is not compatible with Windows 10.You might want to look through Thermal Imaging forum ( probably a better place for this post )https://www.eevblog.com/forum/thermal-imaging/and see if other people have found solutions to running FLIR Windows 7 software on Windows 10.Worst case is you can just have a Windows 7 VM running in VmWare player inside Windows 10 and use that.

author: Simon
author_rank: Unknown
timestamp: January 16, 2018, 06:52:45 am
content: Please do no double (or more) post a topic. It creates a lot of confusion and won't make you any friends on the forum, you will get a far more productive discussion by keeping it all in the same place.
Floating Osilloscope Safety Tips - Page 1
Forum section: electronics / beginners

author: JetBlack
author_rank: Newbie
timestamp: April 28, 2017, 10:54:15 am
content: Hi guys! I

author: danadak
author_rank: Super Contributor
timestamp: April 28, 2017, 11:18:28 am
content: This might help -https://www.eevblog.com/forum/testgear/floating-oscilloscope/http://www.newark.com/pdfs/techarticles/tektronix/FFM.pdfhttp://www.techni-tool.com/site/ARTICLE_LIBRARY/Tektronix%20-%20IsolatedInputOscopes.pdfRegards, Dana.

author: tggzzz
author_rank: Super Contributor
timestamp: April 28, 2017, 11:18:54 am
content: Don't float a scope if you value your equipment and health.Or, slightly more accurately, if you want to float a scope you have to do something like:In other words,don't do it.Have a look at the references inhttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/for further information
floating outputs on psu  - Page 1
Forum section: electronics / beginners

author: amateur_25
author_rank: Regular Contributor
timestamp: August 26, 2012, 08:45:12 pm
content: HiAm I correct in saying floating outputs on psu means you can swap the +ve and -ne to get a negative voltage?If so does it matter if the pre regulator that feed the output regulator has a gnd pin?Here's a block diagram200va transformer ->rectifier -> l200c (has gnd pin) -> lt3080 (floating output)

author: gxti
author_rank: Frequent Contributor
timestamp: August 26, 2012, 09:43:14 pm
content: Negative voltage is simply a matter of choosing a reference. Even if the power supply's "ground" is the negative terminal, as long as it floats you can simply designate the positive terminal as ground and use it as a negative voltage supply.
Floating pins - Page 1
Forum section: electronics / beginners

author: bitman
author_rank: Unknown
timestamp: May 22, 2017, 11:40:52 pm
content: Short and sweet - how do you identify floating pins? I have a "simple" breadboard with a AT28C64B and a 10 position dipswitch for addresses and LEDs to show data. I can hold my hand 10 inches above it, not touching it, and it's clear the address line changes (the LEDs change). I made a small video that I don't think is interesting, but just touching the DIP switches will impact, even touching the address wires.All the wires are pulled to zero using a 10K resistor - I'm simply following a guide and that was what was suggested. I presume the size of the resistor doesn't change the pull to zero, but does it impact how sensitive it is to the waves coming from wires with electricity all around us. I wear an anti-static wristband which is connected to a ground connector (earth ground). All pins are connected.Basically I'm trying to find out where the signal that is "floating" is coming from (I have 10 lines for an address) and once found, figure out why pulling it down with a 10K resistor isn't doing the job (and what to do about it).

author: sleemanj
author_rank: Super Contributor
timestamp: May 22, 2017, 11:50:41 pm
content: Does your breadboard have split power rails and you have forgotten/didn't-know to connect them, meaning some of what you think is ground, isn't ground. Check resistance (continuity) between of all points you think are ground.Post schematic.

author: bitman
author_rank: Unknown
timestamp: May 23, 2017, 12:48:26 am
content: Quote from: sleemanj on May 22, 2017, 11:50:41 pmSleeman - this isn't a new breadboard - the connections are ok. The good news is that while it took a few hours, I finally found the "missing link" so to speak. The missing link was on the dip switch module and was well hidden. I found that by in-directly following your advice. I put a meter on ground, and moves the other side of the meter plugging into the broad board over each resister that was pulling to ground. I had removed all wires forcing them all to ground, which resolved the problem initially. And this revealed a single position that wasn't grounded.In my primitive setup this took quite a while. I do wonder if there's a better way, other than trial and error?
Floating power supply for LCD Digital Meter - Page 1
Forum section: electronics / beginners

author: Doc38343
author_rank: Contributor
timestamp: June 06, 2015, 03:19:24 am
content: I found this on a wildcard site. link herehttp://www.repeater-builder.com/astron/digital-metering/digital-metering.htmlFrom there:I built the capacitor-isolated circuit on a breadboard using whatever parts I had on hand. The 555 IC oscillates at about 40 kHz and it draws about 10 mA just by itself. With 12VDC input, the circuit produces 9.25VDC output with the meter connected. (With 9VDC input, the circuit provides 6.25VDC output, which is just a bit too low. With 15VDC input, the circuit provides 12.3VDC output, which is just a bit too high.) A 9V meter will operate on 7-11 volts so the lack of voltage regulation is not a problem. You can still use an LM78L05 regulator and a 5V meter. The schematic can be found below.If you make a floating power supply with a 555 timer, remember that the output voltage will be related to the input voltage, and that the 555 has a maximum supply voltage of 15VDC. Use a 12V 3-terminal regulator on the input. Use a 5V regulator or zener diode on the output with a 5V meter.NOTE that this config is for a 12V input to produce a 9V appx output. (I built this on bread board and it does work. I have an ATX converted supply and my 12V lead is actually 11.9V and this circuit gives me 6.8V under the load of the digital meter or 9.3V when no load is present.)The digital meter I am using is a 0-100V and 0-10A onboard shunt and supply in is 5v to 30V off EBAY.Also I used a 33uF instead of the 35uF on the schematicThought this may help a few guys like myself...
Flomec-qs100 Open collector output - Page 1
Forum section: electronics / beginners

author: Sambh
author_rank: Newbie
timestamp: September 22, 2023, 09:13:53 pm
content: Hi,We are using multiple of these flowmeters (Flomec-qs 100, please see the link:https://fluidhandlingpro.com/great-...the-flomec-qs100-turf-irrigation-flow-sensor/). Now these have only two output wires and they are supposed to be connected as a open collector output. So connecting a pull-up resistor should work between the collector and the Vcc (power supply, 10-20 V). However, we are unable to display the output pulses on a oscilloscope even when we use a pullup resistor (we used 4.7k, 10 k, etc. see the connection diagram below). We have used a PLC before and it was able to count the pulses. But my question is how can I display the pulses in a scope or sample them with a National Instrument DAQ device. Thanks.Samik

author: thm_w
author_rank: Super Contributor
timestamp: September 22, 2023, 10:37:06 pm
content: Cross posted here:https://forum.allaboutcircuits.com/threads/flomec-qs100-open-collector-output.196211/and here:https://www.eevblog.com/forum/testgear/flomec-qs100-open-collector-output/?topicseen
Floppy disk drive STEP signal driving a LED - Page 1
Forum section: electronics / beginners

author: caius
author_rank: Regular Contributor
timestamp: December 17, 2022, 11:55:53 pm
content: Hi all,I'm trying to drive a LED by the STEP signal (active LOW) of a floppy drive but LED lit briefly when single pulse occur.Do I need to a stretching circuit, perhaps?Can you advice me some solution?Thanks in advance.

author: retiredfeline
author_rank: Frequent Contributor
timestamp: December 18, 2022, 02:08:08 am
content: Yeah you need a monostable. Lots of designs around of which fer shure they'll be a 555 one.

author: Stray Electron
author_rank: Super Contributor
timestamp: December 18, 2022, 02:52:14 am
content: All you need is a simply Logic Probe circuit. There should be plenty of circuit designs available online.

author: caius
author_rank: Regular Contributor
timestamp: December 18, 2022, 11:17:15 am
content: Thanks for replies.The STEP pulse is around 7us as measured by a logic analyzer :I have in mind the attached designs (without 555 for now), which could be the more appropriate? (RC value must be adapted obviously)
Flow type tips?  - Page 1
Forum section: electronics / beginners

author: u666sa
author_rank: Frequent Contributor
timestamp: September 13, 2023, 09:08:36 am
content: Plz disregard the size. They make these micro, small, and large. They are called flow type tips.How would one use this?Right now I find useful blade type, conical, chisel, bevel and j hook.I tried to picturing me using one of this, and I really have no clue.

author: wraper
author_rank: Unknown
timestamp: September 13, 2023, 09:20:41 am
content: They are used exclusively for drag soldering. Apply some solder and drag over multiple IC pins.

author: liaifat85
author_rank: Regular Contributor
timestamp: September 13, 2023, 02:18:26 pm
content: This is the first time I have seen this type of tip. Thanks to Wraper for the clarification.

author: tooki
author_rank: Super Contributor
timestamp: September 14, 2023, 05:25:23 am
content: FWIW I actually find them to be useful beyond just drag soldering, because the little cup likes to pull off excess solder. This makes them surprisingly useful for various soldering tasks.
Flowmeter Pulse generator - Page 1
Forum section: electronics / beginners

author: meeder
author_rank: Regular Contributor
timestamp: June 07, 2018, 04:31:00 pm
content: I had the chance to take apart an old mechanical flowmeter and I was a bit puzzled by the way the pulse output works.In electronic flowmeters the pulse output is normally of the open collector type but this mechanical one obviously has to use a different method since the flowmeter isn't powered.There is a sensor which has two small coils and a disc which turns in between these coils. The pulse input of the PLC has a active 24V DC supply connected to the pulse output. When disc turns there is a pulsing current flow proportional to the volume flow through the measuring device.Can someone enlighten me on how this arrangement is working?
Fluctuating AC/DC readings on my new digital meter - Page 1
Forum section: electronics / beginners

author: giolicious
author_rank: Newbie
timestamp: December 02, 2011, 10:20:43 am
content: I got a new digital multimeter today and wanted to test some AA batteries and our mains. But before i would even test anything, i already see fluctuating readings on my meter when i turn to AC or DC. Is this normal? although i get accurate readings when testing. i've got an auto range digital multimeter.

author: mobbarley
author_rank: Regular Contributor
timestamp: December 02, 2011, 10:22:38 am
content: You mean that the display is changing without anything connected? How much does it vary by?

author: grenert
author_rank: Frequent Contributor
timestamp: December 02, 2011, 11:06:19 am
content: This is a recurring question here. You need to short the leads together to get a zero reading on your meter. You will get nonsense readings like yours on a DMM if you are on ACV or DCV with nothing connected, or the leads connected and not shorted together. It is a consequence of the high input impedance of DMMs, which is generally a good thing.

author: giolicious
author_rank: Newbie
timestamp: December 02, 2011, 11:12:50 am
content: QuoteYes that's what i meant.Please see attached pictures.QuoteI tried shorting the leads and it went down to zero but otherwise it's displaying fluctuating readings still. So I assume this is normal? Please see attached pictures.

author: mobbarley
author_rank: Regular Contributor
timestamp: December 02, 2011, 01:01:43 pm
content: As above - nothing to be concerned about, that reading is very small. Assuming that it drops to practically zero when the leads are shorted.

author: giolicious
author_rank: Newbie
timestamp: December 02, 2011, 01:59:29 pm
content: Quoteyes it drops to zero when shorted. ok thank you guys.

author: Unknown
author_rank: Unknown
timestamp: December 02, 2011, 09:46:32 pm
content: One of your pictures shows a 50 mV reading. With a 10 Mohm input impedance, it takes about 5 nA to induce this voltage. This can easily be picked up by the leads. This problem is worse on some meters with an even higher input impedance. Even some cheap DMMs have a FET-input (Gohm impedance or so) mode on the lowest mV ranges.This can actually be a real issue, and is the reason why some of the products aimed at electricians have a lower input impedance, or the ability to switch from 10 Mohm to a few kohm or so. If you're measuring the voltage between two wires, you may not have any way to check if they're connected. Capacitive coupling with other wires can easily give high (eg. 80V) voltage readings with 10 Mohm DMMs.
Fluctuating resistance - Page 1
Forum section: electronics / beginners

author: darinsquared
author_rank: Contributor
timestamp: November 23, 2019, 02:24:05 pm
content: I have a Klein CL210 DMM. I am trying to test a transistor. When I test resistance across the base and emitter the reading will not reach a constant. it keeps climbing. same thing if I reverse the leads. The batteries have full voltage. is this an issue with the DMM or the transistor?I have an older Innova DMM and trying to test on diode mode and am not having luck either but I think it is an issue with DMM

author: GerryR
author_rank: Frequent Contributor
timestamp: November 23, 2019, 03:54:15 pm
content: Are you trying to test the transistor while in circuit or out of circuit? If in circuit, you may be seeing the effects of other components, like capacitors. If out of circuit, you need to use the diode test function, base to emitter, emitter to base; base to collector, collector to base. If it is an FET, then there is a different procedure to use with a multi-meter.
Fluctuating voltage on smd capacitor - is it normal? - Page 1
Forum section: electronics / beginners

author: xboxgamer
author_rank: Contributor
timestamp: July 22, 2023, 09:59:09 pm
content: My Viofo V2 dashcam died. No power, no lights, nothing, completely dead.I took it as an opportunity to try and fix it myself.There is no shorted capacitor on the board so I started to measure voltage on some elements.And I found something potentially weird but since I'm a total beginner I decided to ask here.I connected dashcam to my power bank to supply 5V.There are a lot of capacitors on the board. Most of them show 0v on one side since it's ground and they show sometimes 4.7v on one side, on another it shows 2.5v but the thing is that the voltage is stable.Now, I found approx 5 caps that don't show stable voltage. When measuring them using my multimeter one side shows 0v as expected but the other side of cap shows voltage dropping the more I hold my probe on it. It starts with approx 2v and quickly drops to 1.8,1.7.1.4... and drops to 0.7v, 0.6v etc.Is it normal? I suppose it should stay stable but it's like cap is discharging while I measure voltage on it.What could be the reason for that?Thanks

author: LooseJunkHater
author_rank: Frequent Contributor
timestamp: July 28, 2023, 03:40:23 am
content: Your multimeter does actually have resistor(s) inside which is what is draining the capacitors of the device under test.What's likely happening as that quickly upon plugging in/turning on the dashcam, those caps charge up, and then the dashcam shuts off for whatever reason, leading to those caps slowly draining.If you have a picture of the PCB, we may be able to point you in the right direction for what's wrong.

author: MathWizard
author_rank: Super Contributor
timestamp: July 31, 2023, 08:20:03 am
content: Can you measure the current into the device with your meter ? Depending on the power plug, you might have to solder on a wire. If you meter didn't have current, you could use a really small resistor in series, like a a 1 ohm. It might get really hot, really quickly tho, depending on the current.Are there any chips near the power in ? Most things these days would have some step down voltage converter(s), with inductors. Have a look around at all the chips, see if they are labelled, look up their Vcc, and you could try to figure out the voltage rails from that.
Fluke 105 Series ii Questions.  - Page 1
Forum section: electronics / beginners

author: chinoy
author_rank: Regular Contributor
timestamp: June 16, 2020, 06:13:18 am
content: 1. The foil on my scope has stoped working. I have a temp fix with spit and kitchen foil but its allways a miss and a go.I see they have a PCB version as a foil replacement but to import that would cost me more than the price of a new scope. 75$ for the PCB 40$ for shipping and 100% import duty.So on the off chances does anybody have a gerber to make a PCB for this scope.2. I have two signals I am trying to measure. I need to get the time delay between these two.Input on signal A and B. Both square wave pulses.Trigger for input A is Input A and trigger for Input B is input A.Need the screen to show time delay as in how long after Triger A did Triger B fire.Right now I am sitting and counting the faded dots on a faded screen. Not fun for my old eyes.3. Do you think any of those cheap pocket DSO scopes could replace my existing scope. Im dont with Fluke this is my 3rd scope that has given out on me. And its allways the same problems.Keyboard foil designed to fail in a year or two.Backlight which fades.Screen which fades. (Yes I tried cleaning the contacts).Thank you for your time.
Fluke 105b series II Setting - Page 1
Forum section: electronics / beginners

author: Jmol
author_rank: Newbie
timestamp: February 03, 2019, 02:33:54 pm
content: Maybe a stupid question but still asking it anyway.This fluke 105b was a gift from my grandfather and now that I want to use it, I don't get a reading out of it.I want to use the multimeter section, so I'm using the ext. probesBut as soon as I put my probes in the Walloutlet I get a OL reading in the display on but Vrms AC aswell is OL Vrms DCI can see from the graph that the fluke is actually reading the voltage of my outlet but it is not showing any numbers, just OL.Does someone know what I'm doing wrong?
Fluke 115 showes 0 Amp all the time! - Page 1
Forum section: electronics / beginners

author: ECE Misho
author_rank: Newbie
timestamp: November 16, 2014, 09:10:12 pm
content: hello,as stated in the title, i have fluke 115 and it can't measures amperes ( showes 0.000) always.is it need fuse replacement? or something else?(i removed the fuse and the same happening)thanks in advance~

author: AG6QR
author_rank: Frequent Contributor
timestamp: November 16, 2014, 09:32:43 pm
content: Most likely cause is a blown fuse.To check, put your meter on ohms measurement, and using only ONE probe plugged in to the red V socket, stick the end of the probe into the A socket. You should get a very low reading, much less than an ohm. If the fuse is blown, you will get an infinite reading, the same whether your probe tip is touching the A socket or not.An alternative is to remove the fuse and use both the black and red probes to check it for continuity in the normal way. Again, you'll get a very low reading if it's good, infinite resistance if it's blown.

author: ECE Misho
author_rank: Newbie
timestamp: November 16, 2014, 10:11:08 pm
content: Quote from: AG6QR on November 16, 2014, 09:32:43 pmthanksthe fuse (for sure!) is blown

author: retiredcaps
author_rank: Super Contributor
timestamp: November 16, 2014, 10:16:19 pm
content: Also documented in your Fluke 115 manual at (page 16)http://media.fluke.com/documents/114_____umeng0100.pdf

author: ivan747
author_rank: Super Contributor
timestamp: November 17, 2014, 11:57:02 pm
content: Remember to get a genuine fluke fuse, not from eBay, preferably from Fluke or an authorized distributor or somewhere like Digi-Key.
Fluke 123 scopemeter voltage specs  - Page 1
Forum section: electronics / beginners

author: 350mdk
author_rank: Newbie
timestamp: January 11, 2018, 05:33:49 pm
content: Hello everyoneBeen new here im not even sure that my question is in the right catergoryBut here goes anywaysWith a fluke 123 scopemeter..the specs state 600v max voltage to groundI know these were designed to test industrial equipment like vfd etc600v is not enough to measure the dc bus voltageWill the meter take 1000v D.C. ?If so with what probes etcThank you in advance
Fluke 1587 strange readings  - Page 1
Forum section: electronics / beginners

author: 350mdk
author_rank: Newbie
timestamp: August 03, 2023, 07:41:14 am
content: Hi all sorry for the newbie questionI recently purchased 2 used units of the fluke 1587 without Bluetooth....the originalThe one tester works greatThe other is giving me a strange reading on insulation testAt 50v with open 55mega ohm ...goodAt 100v with open 110 mega ohms ..goodAt 250v with a open 275 mega ohms...goodNow at 500v with a open should be 550 mega ohms but meter shows 70 and climbing upSame at 1000v same happensAny chance someone knows what's going onAll other functions work perfectly absolutely spot onIt's just those 2 r notThanking you in advance
Fluke 15B+ and 17B+ meters from china  - Page 1
Forum section: electronics / beginners

author: robsims
author_rank: Frequent Contributor
timestamp: August 04, 2022, 08:06:03 pm
content: If you have Fluke 15B+ and 17B+ meters from china, please share you're experiences.https://www.amazon.com/Fluke-Digital-Multimeter-Latest-Version/dp/B00NE9FF40/ref=cm_cr_arp_d_product_top?ie=UTF8https://www.amazon.com/SSEYL-FLUKE-Digital-Multimeter-F17B/dp/B00SF3SQ50/ref=sr_1_28?crid=KRUIE89AE7GD&keywords=fluke+massey+17b&qid=1659643437&s=industrial&sprefix=fluke+sseey+17b%2Cindustrial%2C168&sr=1-28Are these meters good or not? Can i buy them? Many thanks for sharing information

author: tautech
author_rank: Super Contributor
timestamp: August 05, 2022, 04:29:36 am
content: 15B (not +) user here. Sourced from China some 8/9 years back and have never given any issue.We got 17 units, 15 for a client and a couple extras in case warranty replacement was needed however being Fluke of course it wasn't.Our customer checked his regularly with a DMM check from USA and as they were used by students aligned them all so the LSD matched.They never drifted and AFAIK are still in daily classroom service all these years later.While shipped with Fluke leads I must say their quality of use is not very nice as they are some cheaper PVC leaded things, not nice silicone jobbies.I'd have no hesitation sourcing another Fluke meter from China despite that they are only warrantied in China.
FLUKE 175 / FLUKE 179 Battery Connector - Page 1
Forum section: electronics / beginners

author: thiborba
author_rank: Newbie
timestamp: August 03, 2022, 08:23:16 pm
content: Hi All, first post and question.I have a Fluke 175 and 179 with broken battery connectors, I need to know the correct spec for JST 2.0 because this is a little different, botton side to connect on PCB is flat and the sides have a cavityI didn't find a mounted part for this . Any suggestions?Anyone can test if a model of JST 2.0 correctly fix?Sorry for bad brazilian english

author: bateau020
author_rank: Frequent Contributor
timestamp: August 04, 2022, 07:16:58 pm
content: None of the JST 2.0mm connectors I could find will fit. Might be another manufacturer.You might try via the fluke part numbers (the following is from the calibration manual):Battery Connector, serial number 8391100 and below, and 83911241 to 84060000 : Part number 825976Battery Connector, serial numbers 8391101 to 83911240 and 84060001 and above: Part number 1988201

author: tooki
author_rank: Super Contributor
timestamp: August 05, 2022, 05:17:13 pm
content: First of all, just to be clear, there’s no such thing as a “JST 2.0mm” connector, because JST has many connector series with 2mm pitch.Anyway, it looks to me like the Molex Micro-Latch series:https://www.molex.com/molex/products/family/microlatch

author: Doan nguyen
author_rank: Newbie
timestamp: October 09, 2022, 06:44:43 am
content: IRLML6302 SOT-23 MOSFET P-Kênh -20V / -780mAWhat mosfet will be replaced?Thank