hybridfree/eevblog-posts huggingface dataset:
LVDS to DVI converter problems  - Page 1
Forum section: electronics / beginners

author: pigtwo
author_rank: Regular Contributor
timestamp: February 04, 2016, 11:32:35 pm
content: Hello all,This is kind of a long shot but I thought I would see if someone here happen to know.I'm working with a ComExpress(Here) which give me a LVDS video out. I need to convert this to DVI. I bought an off the shelf LVDS to DVI converter(Here) and it worked perfectly. Then the ComExpress(New ComExpress) we are using changed and the converter no longer worked.The weird part about this is I have some flat panel displays which use the LVDS directly and they work for both modules. So I tried a different LVDS to DVI converter(Here, ignore the fact that it's 24-bit. I confirmed that it will work besides giving a washed out effect) This converter worked on the original ComExpress but did not work on the new one.I've tried all the graphics BIOS options on the ComExpress and none of them work. I should note that all the LVDS signals and displays are 18-bit.I scoped the LVDS signals of the first and second ComExpress and noticed that the one that doesn't work has lower amplitudes than the working one. Attached are the scope measurements with no changes besides the ComExpress used(I even didn't move the probe cables).I probed the DVI port and it is clocking and sending data(I can't easily validate that data though).That's where I'm at now. I'm not sure what could be causing the problem. Does anyone have experience with any of this or have an idea of what could cause it?Thank you!
LVDS Touch Display Interface - Page 1
Forum section: electronics / beginners

author: novelpuffin
author_rank: Newbie
timestamp: February 26, 2019, 02:49:13 pm
content: I'm trying to interface a Gateworks ventana board which has a 30 pin connector with a Displaytech LCD touch display with LVDS interface. The display has one ribbon that has 6 interface signals attached to the controller and another ribbon with 40 interface signals. I've read through the datasheets a little, but I'm not really sure what to do. How do I connect my board to my display?Gateworks board:http://trac.gateworks.com/wiki/ventana/LVDSTouch Display:https://www.digikey.com/product-detail/en/DT070BTFT-HB-PTS1/1756-1057-ND/9564148?utm_medium=email&utm_source=oce&utm_campaign=2481_OCE19RT&utm_content=productdetail_US&utm_cid=650135&so=58522393&mkt_tok=eyJpIjoiTmpjeU5HVXhOMlpqTVdFMSIsInQiOiJCeHE2dDZIVTJleHpcLzNDVWRQSXJVZ0JRWjJCUWNMQk5vcGd0RFhjdU56SHhvRG1JS0Vudms0am9lXC9QQjZtUkROb0RDVGFZeElkVXRYN242QWNyK2RKSVBvSUNuY1hzMnRtNWFcL1JHZUQ1RE5JRWFsMlZjN0RzdGI2U3dpSzN3ZyJ9
LW Mesh Node Discovery - Page 1
Forum section: electronics / beginners

author: Peili
author_rank: Regular Contributor
timestamp: August 17, 2018, 07:00:52 am
content: hii'm planning to do an application, which automatically search and find the devices near by.I have loaded LWmesh 1.2.1 in 256rfr2 and trying to perform node discovery.I did it in such a way the coordinator broadcast ND in an interval. In the node side whenever it gets ND , it needs to send a static value(for the time being), but i didn't receive anything. I'm not sure this is the best method, please help me to do in better way..

author: ataradov
author_rank: Super Contributor
timestamp: August 17, 2018, 04:05:20 pm
content: Well, the general idea is correct, and that's exactly how route discovery is implemented internally. So it if does not work, then you did something wrong. But there is clearly not enough information to tell what exactly is wrong.Can you just send the frame from the node, not in response to the request?
Lwmesh Broadcast frame Modification - Page 1
Forum section: electronics / beginners

author: Peili
author_rank: Regular Contributor
timestamp: August 21, 2019, 06:23:55 am
content: Hi,i would like tomodify the Brodcast frame at Router side which is received from End Device.. I read the developer document that"The Link Local subfield is 1 bit in length, and it may be set to one to prevent neighboring nodes from rebroadcasting a frame".. I set my code in End Device asCode:appNwkDataReq.dstAddr = 0xFFFF;appNwkDataReq.dstEndpoint = APP_ENDPOINT;appNwkDataReq.srcEndpoint = APP_ENDPOINT;appNwkDataReq.options = NWK_OPT_ENABLE_SECURITY|NWK_OPT_LINK_LOCAL;but the broadcast frames are still broadcasting from the Routers.. How can i manage this frames.. Is my configuration is ok?

author: ataradov
author_rank: Super Contributor
timestamp: August 21, 2019, 06:32:07 am
content: The code is fine. Once again, why not set a debugger in the router and see why it rebroadcasts?The check that should prevent rebroadcasts is "0 == header->nwkFcf.linkLocal" in nwkRx.c.

author: Peili
author_rank: Regular Contributor
timestamp: August 21, 2019, 06:39:05 am
content: Quote from: ataradov on August 21, 2019, 06:32:07 ammyRouter configurationisCode:appNwkDataReq.dstAddr = 0;appNwkDataReq.dstEndpoint = APP_ENDPOINT;appNwkDataReq.srcEndpoint = APP_ENDPOINT;appNwkDataReq.options = NWK_OPT_ACK_REQUEST | NWK_OPT_ENABLE_SECURITY;is this ok?Where to set debugger in Router code?

author: ataradov
author_rank: Super Contributor
timestamp: August 21, 2019, 06:40:41 am
content: This is not a "router configuration". This is just a configuration for some request. Broadcasts have nothing to do with what happens on the application level. This is totally irrelevant to anything.Also, this is the last reply if you don't start capitalizing your sentences.
LWMesh -physical sleep - Page 1
Forum section: electronics / beginners

author: Peili
author_rank: Regular Contributor
timestamp: March 30, 2019, 09:50:34 am
content: Hi,we are using Lwmesh 1_2_1 version. We need to put the device in a sleep for 2 sec.My function calledHAL_Sleep(APP_SENDING_INTERVAL);withAPP_SENDING_INTERVAL =2000.It will not go for physical sleep of 2sec. How can i put my device into physical sleep?

author: ataradov
author_rank: Super Contributor
timestamp: March 30, 2019, 05:08:16 pm
content: You need to go through the whole sequence NWK_Busy() - NWK_SleepReq() - HAL_Sleep(APP_SENDING_INTERVAL) - NWK_WakeupReq(), just like the sample application does.NWK_SleepReq() prepared the stack to sleep and puts the radio to sleep HAL_Sleep() only puts the MCU to sleep.

author: Peili
author_rank: Regular Contributor
timestamp: April 01, 2019, 10:54:11 am
content: Quote from: ataradov on March 30, 2019, 05:08:16 pmHow can we wake up from HAL_Sleep()? When i call HAL_Sleep () device goes to sleep and changed the app state to wake up but id didn't wake up..

author: ataradov
author_rank: Super Contributor
timestamp: April 01, 2019, 04:13:52 pm
content: It wakes up after the set timeout. But generally any way you can wake up the MCU could be used.Read the datasheet fir details.

author: Peili
author_rank: Regular Contributor
timestamp: April 04, 2019, 12:59:01 pm
content: Hi,We are using atmega256rfr2 and LwMesh 1_2_1 stack.Now we configure our sleeping device(end device) withWatchdog timer of 2 sec interval. One WDT interrupts get devices just wake up and called appsenddata() twice and got to sleep(HAL_SLEEP()).. So the device alive only for 125uS. We are trying to read routing table entry to get next hop address(parent address of ED). But, most of the time the ED doesn't deliver the exact parent address(nearest parent address).When we disable the WDT the ED send exact parent address. What to do to get the exact parent address with WDT interval of 2sec/4sec.The configuration for End device :Code:#define APP_SENDING_INTERVAL2000#define NWK_ROUTE_DEFAULT_SCORE1#define NWK_ROUTE_DISCOVERY_TIMEOUT 200changed the sleep function inHAL_Sleep()function and the code is :Code:void HAL_Sleep(uint32_t interval){halSleepTimerEvent = false;set_sleep_mode(SLEEP_MODE_PWR_DOWN);cli();while(1){sleep_enable();sei();sleep_cpu();sleep_disable();if(halSleepTimerEvent){return;}}ISR(WDT_vect){halSleepTimerEvent=true;//WDT_Stop();}

author: ataradov
author_rank: Super Contributor
timestamp: April 04, 2019, 05:23:45 pm
content: I have not worked with AVRs in ages, so I have no idea about the actual sleep procedure. My old code just used a regular asynchronous timer for sleep.But I don't see how this may be related to getting correct entries at all. Sleep should be transparent to the stack.
LWMESH ROUTER - Page 1
Forum section: electronics / beginners

author: Neethu
author_rank: Newbie
timestamp: May 26, 2019, 07:14:53 am
content: hi all, i'm new to LWMESH and i would like to use LWMESH1.2.1 version.. i would like to make one coordinator and 5 router and 2 end devices.. theend devices send its Address and some sensor data to Coordinator. End device place so far from coordinator and it should route to Coordinator..When it route the data a decision check should take at the side of router..Where i can add that decision check at router side? i have to analyse the data come to router(sensor data value greater than some value)..then the router should take decision like the data should route or ignore... How can it be possible? Please help to solve this..

author: Neethu
author_rank: Newbie
timestamp: May 26, 2019, 07:16:49 am
content: Now i'm able tosend data from End device to Coordinator.. But can't do the decision check.. All the data from end device is receiving at the coordinator side..
LY SV550C Align Touch screen BGA Rework Station - Page 1
Forum section: electronics / beginners

author: usreworkstationsMODS
author_rank: Newbie
timestamp: May 22, 2013, 05:46:52 am
content: Hey GuysHave anyone heard of newest release of LY SV550C Align Station? Do you have them? If so, please share your experience of it!
lytec LP5422 - Page 1
Forum section: electronics / beginners

author: madeeb
author_rank: Newbie
timestamp: December 14, 2020, 10:09:34 am
content: Hi GuysCould any one help me with explaining the attached schematic circuit diagram of the Lytec LP542 Power supply Board.Regards

author: m k
author_rank: Super Contributor
timestamp: December 15, 2020, 04:09:32 pm
content: It counts on induction more than many.

author: Dakkahun
author_rank: Contributor
timestamp: December 15, 2020, 04:53:24 pm
content: Is this a power supply from an oscilloscope perhaps?It appeared before in two repair threads,https://www.eevblog.com/forum/repair/gw-instek-gds-2104-power-supply-failure/andhttps://www.eevblog.com/forum/repair/help-with-a-smps-(lytec-lp5422/As others have noticed, it looks like the schematic is not complete, more precisely there is no path for the rectified voltage to the rest of the circuit.Perhaps the photos in the first thread can help.
M2 connector hole positions - Page 1
Forum section: electronics / beginners

author: nihial
author_rank: Regular Contributor
timestamp: September 25, 2018, 08:17:50 pm
content: Hello,I have a board where I need to include a M2 connector from amphenol :https://www.mouser.be/datasheet/2/18/Amphenol_CMDTXXXXXX001-4-1157232.pdfBut I'm not sure where to put the mounting holes, the drawing is not explicit enough for me and I can't get an answer from the manufacturer.My best guess is the 1.75mm cotation on the attached file but it's still a guess, does anyone knows if this is correct ?Best regards,nihial

author: Buriedcode
author_rank: Super Contributor
timestamp: September 25, 2018, 08:28:24 pm
content: Looking from the side, it appears the pegs (mounting holes) is 9 - 5.7 = 3.3mm from the front. And 5.7mm from the back.From the front it isn't that clear. But it does suggest both at centred 10mm from the centre. So, if the connector is 22mm wide. Then the mounting holes are at 1mm and 21mm from the left or right edge.Also note one peg is 0.9mm diameter, the other is 1.4. SO the gap from the left to smallest peg is 1 - (0.9/2) = 1 - 0.45 = 0.55mm. And from the right edge to peg = 1 - (1.4/2) = 1 - 0.7 = 0.3mm.If you're adding this part to your PCB cad package, then as a check, best to print off the layout and check with a real connector.

author: nihial
author_rank: Regular Contributor
timestamp: September 25, 2018, 08:55:57 pm
content: @BuriedcodeHello !I think I didn't made myslef clear I'm sorry. I was talking about the fixations hole of the M2 board that will be in the connector not the mounting holes of the connector itself.I attached a picture of the hole position I'm looking for depending on the M2 card length.

author: Buriedcode
author_rank: Super Contributor
timestamp: September 26, 2018, 03:28:02 am
content: Ahh apologies, the image and link you posted was of the connector itself, so I assumed that was the problem.THe only reference I could find with a quick google was this:https://en.wikipedia.org/wiki/M.2#Form_factors_and_keyingwhich mentions possible lengths. If you're designing something to take a board with this form factor - I would just buy one and measure it.

author: nihial
author_rank: Regular Contributor
timestamp: September 26, 2018, 08:40:34 pm
content: Quote from: Buriedcode on September 26, 2018, 03:28:02 amIt's a good idea I think I'll do that. Thank you
M90E32AS Current Measurement Support and Circuit Clarification - Page 1
Forum section: electronics / beginners

author: Freshman
author_rank: Regular Contributor
timestamp: May 10, 2025, 01:50:38 pm
content: 1. Does the M90E32AS (https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/Atmel-46003-SE-M90E32AS-Datasheet.pdf) support shunt-based current measurement, or is it limited to current transformer (CT) inputs only?2. Referring to the schematic image below:If I connect a current transformer to the J-IC connector, does the current entering through pin 1 always return via pin 2, effectively completing the path through the transformer?3. Additionally, could you please clarify the purpose of the ground connection between the two burden resistors, and why two burden resistors are used instead of a single one?

author: floobydust
author_rank: Super Contributor
timestamp: May 10, 2025, 02:59:27 pm
content: Didn't you ask these questions already? in this thread you startedhttps://www.eevblog.com/forum/beginners/clarification-on-energy-metering-ic

author: Freshman
author_rank: Regular Contributor
timestamp: May 10, 2025, 05:59:47 pm
content: @floobydust, since the question was not answered, I thought to clarify my questions and frame it in a better sense so that it would help me to get better answers.
mA and microA ranges not working on multimeter - Page 1
Forum section: electronics / beginners

author: TechJunkie97
author_rank: Contributor
timestamp: July 15, 2017, 05:53:29 pm
content: Hi, I have a cheap multimeter from eBay (PeakMeter PM8233E). The microA and mA ranges are not working on it, except that everything works fine. I can still measure A by using 10A socket. The mA fuse is rated for 250mA and I am pretty sure that I never measured that much current with this multimeter. Also, the meter just shows some random low values( such as 0.05 mA) when connected in a circuit.

author: Benta
author_rank: Super Contributor
timestamp: July 15, 2017, 05:57:12 pm
content: Fuse is blown. Someone tried to measure voltage using the mA range.

author: TechJunkie97
author_rank: Contributor
timestamp: July 15, 2017, 06:14:57 pm
content: Thanks Benta! I'll replace the fuse. Just wondering, do I also need to check the voltage rating of the fuse? The manual says that I need 250mA/250V fuse.

author: retiredcaps
author_rank: Super Contributor
timestamp: July 15, 2017, 06:17:04 pm
content: Note this meter has two off positions and the uA and mA share the same input terminal as volts/ohms.If the rotary switch is on the right side off position and you have probes plugged into a live source and then switch the meter on to measure volts, you have to pass through the A, mA, and uA first to get to volts.

author: retiredcaps
author_rank: Super Contributor
timestamp: July 15, 2017, 06:19:20 pm
content: Dave talks about uA/mA sharing the same input terminals as volts/ohms in this video below.

author: Zero999
author_rank: Super Contributor
timestamp: July 15, 2017, 06:25:57 pm
content: Wow, two off positions, one next to the current setting and the current sharing the same socket as the voltage! Talk about bad design. Thanks for posting this so I know to avoid meters like this in future.

author: retiredcaps
author_rank: Super Contributor
timestamp: July 16, 2017, 01:32:50 am
content: Quote from: Hero999 on July 15, 2017, 06:25:57 pmAnother onehttps://www.eevblog.com/forum/testgear/aneng-an8001-6000-count-true-rms-multimeter/

author: TechJunkie97
author_rank: Contributor
timestamp: July 16, 2017, 05:11:50 am
content: Thanks everyone for replying. I actually didn't think much when I bought this multimeter. I saw some part of one of Dave's videos about multimeters and planned to buy a multimeter with auto ranging function. I usually work under 12V and 1A so I think this multimeter is just fine for me.
MA40B8R Proximity Sensor Circuit Diagram - Page 1
Forum section: electronics / beginners

author: Angelus
author_rank: Newbie
timestamp: August 04, 2014, 09:24:47 am
content: Hi All,I have a couple of MA40B8R Proximity Sensors that I wanna use to calculate distance. I looked everywhere looking for a circuit diagram to implement, but I got nothing.Would you please provide me with one?I can use IR but I figured MA40B8R Proximity Sensors are more accurate.Your help is much appreciated.Thanks..

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 04, 2014, 09:30:29 am
content: That's a transducer, not a proximity sensor. Look for "Ultrasonic sensor" type stuff, ignore the actual part number
MAC BOOK PRO 2019 MODEL FRIED? SMD'S ON MLB - Page 1
Forum section: electronics / beginners

author: Neptune36
author_rank: Newbie
timestamp: November 29, 2023, 06:47:16 pm
content: Computer lightly used …died, wont charge. No key recovery sequence worked nor trying different ports and chargers. I removed the back and clearly observed two logic board components appeared to have blown up. The SMT NEzML7 chip (three of them) the center one had green powder like substance around it and surrounding area. Nearby, looks like an SMT cap suffered the same demise. There has never been any liquid spill or any other reason owner made to cause this. So in my laymen analysis I figured the logic board is the fault and specifically these components “didn’t like what was going on”.I noticed both fan turbines were covered in dust likely preventing adequate air flow so perhaps over heating may be the root cause. Anyway I searched for these components and no go only replacement logic boards. Anyone have any experience with this kind of failure and even better been able to replace SMD components instead of replacing the entire board? It’s worth a try on a cold day with nothing else to do.I read this on another post on this forum. "There were multiple posts on these forums just after the launch of the 16" where people found that using the USB-C charger on the left ports would cause the 16" MBPro to run the CPU at 100% and have the fans run at high speed, but simply using the charger on the right side ports corrected the issue."

author: Veteran68
author_rank: Frequent Contributor
timestamp: November 29, 2023, 09:41:00 pm
content: I have the 2019 16” MBP and use the left side charging port for both charging and docking. My CPU does not run at 100% and the fans are silent until it gets hot. My only complaint with it is that the i9 version I have can get really hot. Like using it for Zoom/Teams meetings for example. Then the fans sound like a jet engine. If I’m not doing heavy video processing then it doesn’t run hot and I don’t hear fans.

author: shapirus
author_rank: Super Contributor
timestamp: November 30, 2023, 01:34:01 am
content: The one in the bottom part of the picture looks like a tantalum cap to me. They tend to fail short, so that failed cap could short whatever it was connected between, which could explain the blown component (as a result of the short circuit) in the top, which needs a better close-up photo for identifying. Might be a linear regulator.
Macbook LCD HDMI board - A1181 - Page 1
Forum section: electronics / beginners

author: made2hack
author_rank: Frequent Contributor
timestamp: November 07, 2015, 08:22:39 am
content: Hello all,I am having no luck finding a HDMI controller board for an LCD that is from a Macbook A1181 model (the WXGA 1200x800) LCD. I know many HDMI controller boards exist for other LCD manufacturers such as Samsung and whatnot that can be converted to be used with a Raspberry Pi.Has anyone had luck hacking a Macbook LCD to work with such a controller board? My searches have so far found only replacement kits for the entire LCD (now what I am looking for).Thanks,

author: amyk
author_rank: Super Contributor
timestamp: November 07, 2015, 03:49:11 pm
content: A quick Google shows that the panel used for that Macbookisa Samsung. A LTN133W1, to be exact. It's a standard LVDS panel.http://www.ebay.com/itm/VGA-DVI-HDMI-LCD-Controller-Board-kits-12v-4A-ac-power-supply-for-LTN133W1-L01-/251384163696

author: made2hack
author_rank: Frequent Contributor
timestamp: November 07, 2015, 04:09:29 pm
content: Thank you,Can you tell me please the search criteria you used to get the Samsung model number?
MACH-231-15 JC - Page 1
Forum section: electronics / beginners

author: derek
author_rank: Contributor
timestamp: October 14, 2016, 08:34:26 pm
content: Hi,I have to replace Lattice MACH 231-15 JC CPLD chips, with new programmed CPLDs.I have the logic to be programmed, but do not have the programmer to perform this. But can I use a MAC 231-15 SP with JTAG interface to replace the older JC CPLDRegards,Derek
Machine learning in communication systems - Page 1
Forum section: electronics / beginners

author: rakeshm55
author_rank: Regular Contributor
timestamp: May 19, 2020, 01:59:26 am
content: Does AI/Machine Learning has any any role in wireless radios?? especially in edge devices. Which communication layers can effectively accommodate ML provided the latency involved.Is there an ecosystem for applying Machine learning algorithms to wireless communication devices (end device)??ecosystem - hardware radios, software stacks, Opensource reusable software, resources for training Neural networks etc
Mackie 1402 VLZ mixer  hum on main output - Page 1
Forum section: electronics / beginners

author: BluesCam
author_rank: Newbie
timestamp: December 30, 2015, 10:13:20 pm
content: Hello. My 1402 VLZ Mackie mixer has immediate hum when turned on and with no inputs. I took the back off and it lookslike the power supply caps are on a separate small board that is riveted to the main board. Any idea how to separate it?Thanks!

author: BluesCam
author_rank: Newbie
timestamp: January 03, 2016, 06:13:31 pm
content: Doah! They are tiny Allen screws! These old eyes finally realized that.

author: Richard Crowley
author_rank: Super Contributor
timestamp: January 03, 2016, 07:02:10 pm
content: Do ALL of the outputs hum? That would indicate a "systemic" problem, likely failure of a power bulk filter capacitor, etc. What test equipment do you have access to?

author: BluesCam
author_rank: Newbie
timestamp: November 12, 2017, 12:25:05 am
content: Sorry I missed your reply. I think you are right. Since it is a very old mixer now, I don't want to try to repair it. Thanks for your input!

author: Richard Crowley
author_rank: Super Contributor
timestamp: November 12, 2017, 05:25:20 am
content: If you want to dump it, I will take it. What scrap value do you put on it?
MacOS: MPLAB X 6.10 Unresolved include pic16f887.h - Page 1
Forum section: electronics / beginners

author: newtekuser
author_rank: Frequent Contributor
timestamp: July 04, 2023, 07:49:48 pm
content: I am getting an unresolved include in xc.h file, it is unable to locate the pic16887.h file but the file exists in the pic include folder and the project can be built just fine.Adding the path "/Applications/microchip/xc8/v2.41/pic/include/" to for the compiler settings in the project properties menu doesn't fix this.This is not an issue on Windows 11. Does anyone know how to fix this on MacOS?

author: RoGeorge
author_rank: Super Contributor
timestamp: July 05, 2023, 06:36:25 am
content: You wrote "pic16887.h", but the picture is about "pic16f887.h". When something works in Windows but not in other OSs, I look for capitalization of the characters in the filename+path. Windows doesn't care (they are considered the same name), while in the other OSs "A" and "a" are different.

author: newtekuser
author_rank: Frequent Contributor
timestamp: July 06, 2023, 12:57:38 am
content: Looks like I was looking in the wrong place, the pic16f887.h header file is in /Applications/microchip/xc8/v2.41/pic/include/proc. Once I added the path to the compiler the issue went away and the editor is happy now.

author: tooki
author_rank: Super Contributor
timestamp: July 07, 2023, 06:12:46 am
content: Quote from: RoGeorge on July 05, 2023, 06:36:25 amThat is not the case on macOS. (By default, that is.)On macOS, it’s actually on a per-disk basis, depending on whether the disk is formatted with a case-sensitive filesystem or not. Case-sensitive is not recommended for most purposes because too much software breaks.
Made a component Tester /curve Tracer today - Page 1
Forum section: electronics / beginners

author: M0BSW
author_rank: Frequent Contributor
timestamp: March 31, 2013, 06:32:03 pm
content: Made a component tester today , on the input I've put the usual banana sockets plus a bnc type, plus I've added a couple of chokes on the 6v rail, bit of power conditioning, I've tried to keep it neat on the inside. Which is what I feel is the best way forward, the trace on the scope is of an Electrolytic capacitor, I'm very pleased with the way it's come out, accept it will be better once , I've mastered the graphics program , then I won't need to use labels.Station monitor next.

author: w2aew
author_rank: Super Contributor
timestamp: April 01, 2013, 01:42:32 am
content: Nice! Looks like an octopus! Let's see some curves of diodes and such!

author: M0BSW
author_rank: Frequent Contributor
timestamp: April 01, 2013, 06:48:58 am
content: OK when I get finished from work later, it is from a octopus circuit

author: M0BSW
author_rank: Frequent Contributor
timestamp: April 01, 2013, 08:42:52 am
content: Quote from: w2aew on April 01, 2013, 01:42:32 amHere are a few33uf elect,4.7 uf dipped,1n914,en220a, & a power supply diode, something I have noticed that some electroylic show a vertica sort line, and so do some diodes, a resistor shows anything from a horizontal line to a 45 deg line.So not sure if it is sensitive enough from the 6.3 side of the transformer in series with vertical side is a 560 ohm resistor between both sides of the 6.3 rail is a 100 ohm resistor,which goes to the red side of the probe & from the vertical side o, to the black side of the probe is 1000k resistor. not sure if I could make it more sensitive which different values. have diagram if needed so resistors used are 560 ohm,100 ohm,1000k ohms.

author: nadona
author_rank: Regular Contributor
timestamp: April 09, 2013, 10:56:44 am
content: I have this very interesting capacitor picture from late 70' power supply control board. 200uF, 25V, SPRAGUE.Regards
Made a simple variable relaxation oscilator - Page 1
Forum section: electronics / beginners

author: zeal422
author_rank: Contributor
timestamp: January 08, 2024, 06:39:14 pm
content: Hey! And yes, I am still a noob in electronics, but learning... Here it is...https://i.imgur.com/FgzsZ8u.mp4It's so cool to know the potential of these old babies, basically they're a vacuum tube (of sorts). I was thinking of making a random pattern blinking lamp but if you have more neat ideas in mind, please let me know, cheers!

author: RoGeorge
author_rank: Super Contributor
timestamp: January 08, 2024, 07:08:05 pm
content: Song title?

author: zeal422
author_rank: Contributor
timestamp: January 08, 2024, 07:32:44 pm
content: Quote from: RoGeorge on January 08, 2024, 07:08:05 pmTOOL - Fear Inoculum

author: Zero999
author_rank: Super Contributor
timestamp: January 08, 2024, 07:41:51 pm
content: A reverse bias oscillator.Note this circuit puts the transistor under a lot of stress and will reduce its hFE, so you might not want to use Q1 for other circuits.EDIT: I forgot, D1 should be an LED and I accidentally used a PNP symbol.

author: zeal422
author_rank: Contributor
timestamp: January 08, 2024, 08:00:46 pm
content: Quote from: Zero999 on January 08, 2024, 07:41:51 pmI wasn't using any transistors in this one, just straight small 18VAC variac to a reverse 12-0-12 transformer to control the mains voltage more precisely to get a variation from 0 to 260

author: Zero999
author_rank: Super Contributor
timestamp: January 08, 2024, 08:40:50 pm
content: Quote from: zeal422 on January 08, 2024, 08:00:46 pmI know. I'm familiar with the circuit. It uses the neon lamp as a switch. When the voltage exceeds a certain point, the lamp arcs over and discharges the capacitor, the lamp goes off, once the current drops below a certain value and the cycle repeats.The frequency of the flashing will probably vary with the ambient lighting: it'll speed up in bright light and slow down in the dark.You said you wanted ideas, so I posted one.

author: zeal422
author_rank: Contributor
timestamp: January 09, 2024, 07:08:16 am
content: Quote from: Zero999 on January 08, 2024, 08:40:50 pmOh yeah, absolutely, thank you!It's a pretty neat and simple circuit, I didn't know neons could be this simple yet complex
Made LM317 regulator without thinking - Page 1
Forum section: electronics / beginners

author: lordvader88
author_rank: Frequent Contributor
timestamp: November 13, 2018, 05:56:45 pm
content: I have the internal 24V SMPS from a printer, it's nice, IDK what the amperage might be, I'll check the mosfet as a guide.So I wanted to make it variable so I used an LM317 and a 2N3055 circuit. So I was all happy to have it soldered up on a breadboard and then I realized I don't have the LM317 ref. pin on the OVERALL output, so of course it didn't work.Its funny I never thought it through before I soldered it up wrong

author: lordvader88
author_rank: Frequent Contributor
timestamp: November 13, 2018, 05:59:33 pm
content: I hope I didn't fry the 2n3055 by putting 12.5V across the base-emitter junction. The only load was the +10MO or whatever it is of the DMM I used
Magazines - Page 1
Forum section: electronics / beginners

author: nemo000111
author_rank: Contributor
timestamp: April 12, 2014, 02:31:57 am
content: Are there any magazines, online or in print, that are similar to silicon chip? I'm in the northeast USA, so I'd prefer something readily available locally, but the content is more important than it's location. Thanks.

author: Rigby
author_rank: Super Contributor
timestamp: April 12, 2014, 02:34:12 am
content: Nuts & Volts, and .. there's another. Barnes & Noble carries them in-store, if you want to have a look.

author: Unknown
author_rank: Unknown
timestamp: April 12, 2014, 05:34:24 am
content: Quote from: wilfred on April 12, 2014, 03:55:17 amNo, Leo's paranoia means that you can't read it off-line. It may be justified (I don't think so, but some might) - but either way it severely reduces the usefulness of a paperless subscription.Quote from: wilfred on April 12, 2014, 03:55:17 amThat, and some absolutely ridiculous 'feature' articles by outside contributors (e.g. a couple of sets of multi-part articles on digital radio and TV by Alan Hughes, where almost every paragraph in each contained utter bullshit) are what made me give up. Fact-checking is obviously not a strong point...

author: sean0118
author_rank: Frequent Contributor
timestamp: April 12, 2014, 05:43:13 am
content: Yep disappointing, that publishers letter seems to be completely opinion based. I was expecting more discussion on the challenges of renewable energy.edit: And the bit where he refers to Germany, isn't their engineering and renewable energy design market booming?

author: miguelvp
author_rank: Super Contributor
timestamp: April 12, 2014, 07:04:13 am
content: A big hit with Dave would be:http://www.talkingelectronics.com/te_interactive_index.htmlNot a pretty site but ask him about what it means to himEdit: (the magazine, not the website) Even if it has a ton of content.
magellan roadmate gps - Page 1
Forum section: electronics / beginners

author: Seaofdep
author_rank: Regular Contributor
timestamp: September 01, 2017, 04:17:45 pm
content: gps module with windows ce 5.0i would like to start by saying i understand the risk and if i brick this device or whatever i am totally fine with that. I see this as a leaning experience and would appreciate any advice or help thank you !I found a SD card slot hidden behind a piece of thin plastic with adhesive. and as i opened it up (seriously some of the toughest clips that i ever unclipped lol) every pad/pin was labeled clear as day , rst&clk ,data,vcc,vbus you name it and it was labeled ha.1st: the(blank) sd cards i used to backup data did not work , i tried several formats and not being familiar with TFAT Im not sure what i should do to get them to be read.2nd: i noticed in the app folder on my laptop it has several apps listed that are not displayed att all in device, i am not very familiar with windows. would it be better if i use a windows based o/s rather than linux(device does get mounted on connection)lastly is their any customization ,mods,flashing i can do , or can i somehow have it receive the transmission of one of my gps module that i use for drones maybe even mess with the pads using a micro controller or programmer .any help with any of these or any fresh ideas would be much appreciated (the crazier over the top the idea is the better ) thanks so much for any and all help just want to have some fun with thisactually just found debug port under and only after removing strong adhesive that was holding battery in place
Magic „JFN8-1“ IC - IC Identification - Page 1
Forum section: electronics / beginners

author: eevblogger88
author_rank: Contributor
timestamp: June 02, 2023, 06:57:46 pm
content: I‘m searching for weeks now and haven’t found a answer.Goal:Identification of this IC:JFN8-1 GA167003What it does:If you press the button, it generates a „buzzing“ sound to the 8 ohm 0,25w speaker for 2 seconds. (Not longer even if you hold the button longer)It is driven by 2x 1,5V batteries in series = 3 VIf the button is pressed, 4 LEDs are turning on for 2 seconds as well.More informations:I‘m stunned that this one chip acts as a MCU, DAC and AMP all in one. I thought it is maybe a low powered (3V) 555 chip and the buzzing sound is generated through electricity like in this video:https://youtube.com/shorts/ip5h3PaBz_4But it wouldn’t stop after 2 seconds if I’m right. So that could only be part of the answer.I know I could recreate this circuit with a MCU like RP2040 & AMP & DAC like the Max98357, but that would be a couple of times more expensive. And a normal „piezo buzzer“ doesnt have enough quality.That’s why I would like to know what this „magical“ IC is and how somebody can recreate a cheap circuit like that. (Buzzer sound with real 0,25w speaker & LEDs)Thank you in advance for your time!

author: barshatriplee
author_rank: Regular Contributor
timestamp: June 03, 2023, 08:03:38 am
content: I think it's an 8-pin audio amplifier IC. The outlook is a bit similar to this:https://components101.com/ics/XPT8871-audio-amplifier-ic-pinout-datasheet-circuit
Magjack lan pinout - Page 1
Forum section: electronics / beginners

author: Daxxin
author_rank: Regular Contributor
timestamp: May 01, 2017, 05:49:51 am
content: Hi bought this breakout lan module from its datasheet so far no pinout labelsplease help to identify TX+,TX-,RX+ and RX- at P-1..8 connector

author: jc101
author_rank: Frequent Contributor
timestamp: May 01, 2017, 09:40:06 am
content: On the RJ45 side, the J1-8 on 1 are the same as RJ1-8 on 2, so just follow the schematic.e.g. J3 = P7 = RX+They have drawn the schematics in different orders to make it easier to read in version 1 over 2. The PCB side pinouts often vary, my last project I used tab up sockets to make the PCB layout easier over tab down.Ethernet pairs are 1&2, 4&5, 3&6, and 7&8
Magnetek PSU - Page 1
Forum section: electronics / beginners

author: Billie
author_rank: Newbie
timestamp: June 15, 2017, 06:32:12 pm
content: Hello to All,I'm new here and also fairly green when it concerns electronics.I've been playing around with arduino's and other small stuff, but want to grow and learn moreI've got a couple of Magnetek HPR4915 PSU which came from a couple of old Tally printers from work and since these got multiple DC outputs I thought I could use it as a base for a adjustable bench power supply.One of the outputs is interesting since it has 40V 3.3A. So this should be more then enough to create a adjustable bench psu. But when I connect it to the mains and start measuring the output wires the maximum voltage I get is 20something Volts...Could it be that I need to attach some load to get the full 40V?Regards,Billie

author: ocset
author_rank: Super Contributor
timestamp: June 17, 2017, 08:08:14 pm
content: Maybe you have to put fan on, or make it think the fan is on to make it work properly.Or does it have an enable pin.Or a standby pin?

author: Cliff Matthews
author_rank: Unknown
timestamp: June 18, 2017, 01:42:04 am
content: See if you can find a service manual for whatever MT model it came from. It won't likely give you schematics but it will give you enough voltages and block diagrams to go on. I have 2 load tested PSU's from Lexmark 24xx forms printers and they also produce 40v (a 2.5a). I got mine to work by putting a resistor on a power save pin. One day I'll pull these from storage and use LM723's and 2n3055's for a split supply.As has already been said, it may require a load like a fan to work (some clues may be in the trouble-shooting section).Also, keep in mind switching power supplies sometimes have >300v DC on the bulk input caps... depending on what novice skills you have, I might recommend shelving the unit and buy something like this for now:https://www.banggood.com/GOPHERT-CPS-3205-0-32V-0-5A-Portable-Adjustable-DC-Power-Supply-110V220V-p-934530.html

author: Cliff Matthews
author_rank: Unknown
timestamp: June 18, 2017, 02:16:24 am
content: Is this the unit? (looks totally enclosed..) Have you identified voltages with respect to the black wires?
Magnetic absolute and incremental encoder - Page 1
Forum section: electronics / beginners

author: nForce
author_rank: Frequent Contributor
timestamp: January 18, 2019, 08:11:39 pm
content: I would like to know how does it work the magnetic absolute encoder and incremental one? Not the optical one.I have these 2 signals (in attachment) from the incremental magnetic encoder. How would I calculate the speed of the motor?Thanks.

author: ataradov
author_rank: Super Contributor
timestamp: January 18, 2019, 09:06:04 pm
content: This is the same as optical encoders work.The speed regardless of the direction (assuming that direction is constant) - just use any channel and measure the frequency (number of edge transitions in a unit of time). The RPMs are proportional to that value. Exact coefficient depends on the overall mechanical design of the system.

author: nForce
author_rank: Frequent Contributor
timestamp: January 18, 2019, 09:54:07 pm
content: Ok, in my case it's:(12.02 kHz * 60)/1024From where do we get that 60 and 1024?Thanks ataradov

author: ataradov
author_rank: Super Contributor
timestamp: January 18, 2019, 10:01:12 pm
content: 1024 looks like the number of edges per revolution. Assuming you are counting only rising or falling edges, that would make your encoder to be 4096 steps/rev, which is pretty standard.Where does 60 come from, I have no idea. Do you have any sort of gearing between the motor and the encoder?In your case, if you count N pulses per minute, then RPM = N / 1024, since 1024 pulses constitute the full rotation.

author: rstofer
author_rank: Super Contributor
timestamp: January 19, 2019, 04:33:14 am
content: kHz is in seconds, RPM is in minutes, 60 shows up in there somewhere.

author: ataradov
author_rank: Super Contributor
timestamp: January 19, 2019, 04:35:18 am
content: Yes, that makes sense
Magnetic ballast: coil schematic needed - Page 1
Forum section: electronics / beginners

author: 13hm13
author_rank: Frequent Contributor
timestamp: July 10, 2015, 12:16:14 am
content: Magnetic ballasts have been around for a long time, and are used in apps such as fluorescent lights.Outwardly they look extremely simple -- much like a "transformer" ...... and the way they are usually wired to the fluorescent lamp couldn't be simpler -- there's a connection diagram on the SOLA label above as well as this stand-alone schema.But I can't seem to readily find a magnetic ballast for my 13W, Bulb: PL-S (Single Tube), Base: 2-Pin (GX23) ( I have seen these with both ELECTRONIC and MAGNETIC ballasts).That SOLA in the first pic is the direct replacement as is this Philips...So my question is what's the schematic of the actual coil winding(s)?Thx!

author: SuzyC
author_rank: Frequent Contributor
timestamp: July 10, 2015, 11:24:45 am
content: The ballast is just an a simple inductor wound on a metal core shape, so the standard schematic symbol for an inductor with a core is correct.

author: 13hm13
author_rank: Frequent Contributor
timestamp: July 10, 2015, 04:25:45 pm
content: What's interesting is that 13w G23 (and similar) fluorescents can use either electronic or magnetic (aka inductive) ballasts. But for the G23, the fine print on their datasheet says "lamp voltage" = 55-59VAC (so half line voltage for USA or 120VAC countries).When I measure voltage at the two CFL pins (w/o CFL amp connected), I get ~60VAC (elec. ballast) but full 120VAC for magnetic (inductive) ballast.

author: SeanB
author_rank: Super Contributor
timestamp: July 10, 2015, 07:33:56 pm
content: You can use a 9-11W ballast there as a replacement, they will work. A ballast that is rated for 11-18W operation will also work, at the expense of slightly reduced lamp life. At the low end the lamp is driven by essentially a constant current, and this is almost the same for any small lamp between 7-15W.
Magnetic Coil Can Crusher - Page 1
Forum section: electronics / beginners

author: Russ
author_rank: Regular Contributor
timestamp: December 31, 2017, 03:07:48 pm
content: https://sciencedemonstrations.fas.harvard.edu/presentations/can-crusher-magnetic-implosion

author: paulca
author_rank: Super Contributor
timestamp: December 31, 2017, 03:15:00 pm
content: All my hard disks just ran into the corner of the room and hid their eyes!

author: phil from seattle
author_rank: Super Contributor
timestamp: December 31, 2017, 05:42:06 pm
content: What could possibly go wrong, indeed.

author: Yansi
author_rank: Super Contributor
timestamp: December 31, 2017, 05:47:59 pm
content: Quote from: Russ on December 31, 2017, 03:07:48 pmIs it your work or... the purpose of this post is.. ?Can crusher is nothing new. Have seen some big ones with a lot of angry pixies in their capacitors.Reminding me the video where Mikeselectricstuff blows the shit out of the RCBO.

author: TimFox
author_rank: Super Contributor
timestamp: December 31, 2017, 05:49:46 pm
content: If you want to see a serious use of this technique, go to Review of Scientific Instruments, sometime in the mid-1970s (sorry that I don't have the citation) for a device that crushed aluminum beer cans quickly to use as a shutter on a high-energy particle beam.

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 31, 2017, 08:40:58 pm
content: I want to see someone destroy a steel drum like this.

author: paulca
author_rank: Super Contributor
timestamp: December 31, 2017, 09:24:53 pm
content: Quote from: Cyberdragon on December 31, 2017, 08:40:58 pmMythbusters. Can they do a train carriage oil container? I'd watch that! They did it with a vacuum could they do it with a ship generator and a mega HT coil?

author: Russ
author_rank: Regular Contributor
timestamp: December 31, 2017, 09:52:36 pm
content: Quote from: paulca on December 31, 2017, 09:24:53 pmI would definitely watch that.

author: BrianHG
author_rank: Super Contributor
timestamp: December 31, 2017, 11:08:43 pm
content: , so little power, take a look at this quarter shrinker:
Magnetic coils and permeability - Page 1
Forum section: electronics / beginners

author: fonograph
author_rank: Frequent Contributor
timestamp: August 21, 2018, 04:45:46 pm
content: Imagine the Qi charger,two copper coils being close transfer energy by magnetic induction.There is a coupling factor based on the coil size,shape,distance and orientation.More coupling = more efficient energy transfer.My question is,what if the recieving coil was made from some ferromagnetic type material like iron or nickel? Copper have permeability 1,the nickel or iron will be much higher.Would it increase the coupling factor? I know iron have lower conductivity than copper, and I think magnetic hysteresis losses will also be thing,but isnt generaly higher permeability of the reciever coil going to increase the near-field magnetic induction coupling factor and therefore efficiency?What if the recieving coil was made from some magic material that have same conductivity as copper,no hysteresis loss and permeability 100,will that increase the coupling?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 22, 2018, 09:55:49 am
content: No, or not very much. The coil's wire is perpendicular to the flux, therefore little mutual flux flows.The Q factor will also be pitiful, because those materials have very high AC resistance.Tim
Magnetic inductors....What are they called? - Page 1
Forum section: electronics / beginners

author: Seekonk
author_rank: Super Contributor
timestamp: November 03, 2014, 09:06:46 pm
content: I was taking some components out of a TV before I recycled it. It was a CRT type, one of the last runs for these. I noticed screws and other things sticking to these. These radial open bobbin flyback inductors were wound on a fairly strong magnet. Everyone knows that an inductor becomes just a resistor once it saturates. Starting with a core that is magnetized should allow you to store twice the energy. That is, if you don't drmagnetize the core in the process. Anyway, this is the first time I have seen these in a product and I have been traring things apart for more than 40 years. Went looking for an app note for an interesting read. None of the search terms I used came up with anything. Any idea on what these are called?

author: Rufus
author_rank: Super Contributor
timestamp: November 03, 2014, 11:52:34 pm
content: "Biased Inductor" or " Magnetically biased inductor"Hits a few patents and papers. Doesn't seem to hit any products you can buy.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 04, 2014, 12:02:11 am
content: It's either for extending the useful range of a flyback inductor (does the expense of a magnet justify the added range?), or for controlling the nonlinearity in a saturating application (more likely -- deflection circuitry).Tim

author: megajocke
author_rank: Regular Contributor
timestamp: November 07, 2014, 10:18:58 pm
content: Sounds like the horizontal linearity correction coil:http://www.repairfaq.org/sam/deflfaq.htm#dshlc