hybridfree/eevblog-posts huggingface dataset:
Flexible Displays - Page 1
Forum section: electronics / projects

author: docmur
author_rank: Regular Contributor
timestamp: May 09, 2017, 06:20:23 pm
content: Hey GuysDoes anyone know of any good flexible displays? Something I could wrap around a wrist. I think some OLED's can do that.Thanksdocmur

author: Johnny_Karamello
author_rank: Newbie
timestamp: May 18, 2017, 04:43:44 pm
content: Scroll down to the 4.9" display:http://www.plasticlogic.com/products/displays-with-epson/This might be what you're looking for. As far as I know OLEDs are not there yet. There has been some prototypes but they still have serious defects.
Flexible Flat Cable/Ribbon Cable Stripping Tool - Page 1
Forum section: electronics / projects

author: tjg79
author_rank: Contributor
timestamp: March 07, 2018, 07:35:14 am
content: Hi, I'm looking for a tool to strip and prepare flexible flat cable usually found in computers, printers, and other similar electronics. It's often called power button ribbon cable. These types of cable are very flat with conductors that vary from a few to over 50. The ends are stripped on one side and a stiff piece of plastic material is bonded to the opposite side to aid insertion into the connector.Does anyone have a good recommendation for this tool? I've seen a few YouTube videos where an improvised technique using a razor blade and double sided tape is used to fabricate the ends, but I was wondering what professional hand tool does the job better.Regards

author: tjg79
author_rank: Contributor
timestamp: March 07, 2018, 07:41:56 am
content: Here's a video of a guy using a razor blade and double sided tape to fabricate a laptop power button ribbon cable. I'm posting this to show the type of cable I referring to.Regards
Flexible Heating element - Page 1
Forum section: electronics / projects

author: wilmer
author_rank: Contributor
timestamp: April 27, 2021, 03:03:04 am
content: Hi,I need to head materials inside nozzles at 45 degrees (C). Until these points it is easy. The problem is that the space let between nozzle is 1mm. And the max height is 5mm. I had been looking around and the best option looks like a flexible POLYIMIDE (KAPTON) HEATERhttps://www.flexheaters.com/polyimide-kapton-heater. This looks like a kapton tape with printed conductive ink.The total quantity of nozzle is over 80Have you seen any other option?CheersWil

author: strawberry
author_rank: Super Contributor
timestamp: April 27, 2021, 06:07:18 am
content: flex PCB with copper trace heater and could solder temperature sensor chip as well
Flexible metal conduit or cable for CNC machine - Source? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: November 26, 2024, 08:29:13 am
content: I'm looking for flexible metal conduit or cable, the really flexible style like the type used for a CNC machine or a DRO pickup.They sell various types of conduit on Amazon etc, however it looks more like the not very flexible style more like AC90/BX?One of them will be for 2 conductor power, #16AWGOne of them will be for 6 conductor signalling, #22AWG or soNeed perhaps 2m of each

author: moffy
author_rank: Super Contributor
timestamp: November 26, 2024, 09:32:55 am
content: Seehttps://www.eevblog.com/forum/projects/suitable-cables-for-cnc/might be of help.
Flexible Prototype PCB  - Page 1
Forum section: electronics / projects

author: johnh
author_rank: Regular Contributor
timestamp: November 10, 2019, 04:59:52 am
content: Has any on tried this?https://www.aliexpress.com/item/32800703436.html?spm=a2g0o.productlist.0.0.6d0350a2IZxd7J&algo_pvid=a62b26ca-22eb-4ae3-a356-226e9af776af&algo_expid=a62b26ca-22eb-4ae3-a356-226e9af776af-15&btsid=fc8e3b2f-e39f-412d-8067-8b6833793ab2&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_52
Flexible solar panels - Page 1
Forum section: electronics / projects

author: mrburnzie
author_rank: Regular Contributor
timestamp: August 17, 2022, 06:40:31 am
content: https://www.reddit.com/r/interestingasfuck/comments/wqdaqy/entering_the_next_level/?utm_source=share&utm_medium=ios_app&utm_name=iossmfSorry to cross post to reddit, that is where I have found it.

author: Haenk
author_rank: Super Contributor
timestamp: August 17, 2022, 06:47:38 am
content: Not really "new", but interesting IMHO.Too bad they don't last long and are way less efficient.

author: joeideal
author_rank: Newbie
timestamp: August 22, 2022, 05:14:47 pm
content: Have to agree with HaenikHad something similar fitted on my camper van, should have saved my money as 6 months later the were useless.

author: Marco
author_rank: Super Contributor
timestamp: September 09, 2022, 04:09:49 pm
content: Sunman has a pretty long warranty, of course they could just be planning bankruptcy before it becomes an issue.

author: ejeffrey
author_rank: Super Contributor
timestamp: September 09, 2022, 05:51:16 pm
content: Linking to reddit is fine, but link and run is frowned upon. It's really best if you have some of your own comments or questions to add to the discussion.Thin film solar, including flexible solar has been around for decades. It's less efficient than crystalline, but can be lighter and more robust although some technologies are less reliable. Also, with the crashing price of high volume crystalline and polycrystalline silicon in the last 20 years, thin films are also more expensive. So it really only makes sense in specific applications.

author: Marco
author_rank: Super Contributor
timestamp: September 09, 2022, 06:07:23 pm
content: Sunman is crystalline silicon, they don't say a lot about how they make it though.

author: rooppoorali
author_rank: Regular Contributor
timestamp: September 11, 2022, 03:23:12 pm
content: Are these commercially available yet?

author: Marco
author_rank: Super Contributor
timestamp: September 11, 2022, 06:53:09 pm
content: Sunman have some design wins for large installs here and in Germany (on trucks and some roofs which can't take the extra weight of traditional panels) but the only shop selling directly to consumers here has a ridiculous mark up, an installer might be able to get a reasonable quote from a distributor.Alibabahas them and the mark up in Australia is a little more acceptable too (the owner has an Australian background). Which is not to say the cost per Watt is low, but the mark up from the Alibaba prices is more acceptable.PS. no idea if they can survive hail worth a damn.
Flicker/Trailing with WS2803 LED driver - Page 1
Forum section: electronics / projects

author: PeterFW
author_rank: Frequent Contributor
timestamp: December 31, 2015, 12:14:24 pm
content: Hello!Has someone real world experience with the WS2803 from Worldsemi in regards to visible flicker/trailing when used in lighting applications? The PWM cycle is fast enough for it not the be a problem but how does it look in reality?I would like to use a bunch of them to drive warm white LEDs for a "regular lamp" and i am a bit concerned that they may not be too pleasing to the eye.Greetings,Peter

author: ovnr
author_rank: Frequent Contributor
timestamp: December 31, 2015, 12:46:51 pm
content: A quick peek in the datasheet suggests a PWM frequency of ~4.7 kHz. This will be sufficient to avoid most issues; my own rule of thumb is that you need well over 1 kHz to get acceptable streaking/trailing characteristics.If you just want to see if it's viable, grab a random microcontroller and have that PWM some LEDs at said frequency.

author: PeterFW
author_rank: Frequent Contributor
timestamp: January 02, 2016, 09:36:44 pm
content: Quote from: ovnr on December 31, 2015, 12:46:51 pmThank you, simple solution, i dit not think of that!But... i found an old board with a WS2803 and a few LEDs on it i made years ago to test the chip.I had completely forgotten about it.No flicker, no streaking, all systems go!Greetings,Peter
Flight Instrumental Panel for Flight Simulator 2020 - Page 1
Forum section: electronics / projects

author: brutester
author_rank: Contributor
timestamp: December 27, 2020, 06:52:35 pm
content: I had spent some time building this as a side project (just for fun).It uses MSP430 (16 bit MCU, 25 MHz, 8 kB RAM), software is written with TI-RTOS. It connects to the PC via USB and can receive/send data to MSFS2020 using SimConnect SDK.

author: moffy
author_rank: Super Contributor
timestamp: December 29, 2020, 08:28:26 am
content: Nice display, how are the graphics drawn? Impressive

author: rstofer
author_rank: Super Contributor
timestamp: December 30, 2020, 06:43:41 pm
content: That's a really nice piece of work!
Flipdot Driver - Page 1
Forum section: electronics / projects

author: ruumoo
author_rank: Contributor
timestamp: January 15, 2019, 08:01:50 pm
content: This is my design for a driver for a flipdot matrix, but as I'm still inexperienced with higher power electronics, it would be great if you could take a quick look at my circuit and tell me if this is siutable or if it would end in a disaster if I built it that way.The dots are represented by the coil with the two diodes. Each dot has the two series diodes I put into the symbol, to stop the current from randomly flowing through the whole matrix.To flip the dots, current has to be pulsed through them in one or the other direction.My dots can be run at 5V and have a resistance of ~20per dot, therefor the current is about 250mA through each dot.I chose to multiplex through the Columns, even though multiplexing the rows would be easier, as you could connect the Column FETs together. doing it my way I have to controle the two FETs seperately, but I only have to source/sink ~3A per column.the rows are directly controlled by TPIC6B595 shift registers, that can source and sink 500mA/Pin, which is sufficient, as only one column at a time will be active, therefor each Pin only has to drive one dot at a time.I hope I'm not too far off and I appreciate any comments
FlipFlop - Page 1
Forum section: electronics / projects

author: modernjack3
author_rank: Contributor
timestamp: February 03, 2016, 09:19:01 am
content: Hello guys ! I am currently trying to safely transfer a high Signal from the last bit of a "SN74HC595N" to the "data in" of another.My plan is to get the Flipflop "high" when pin 8 is active and "low" when pin 1 of the other one is "high".So which Flipflop/ part should I use?

author: Paul Price
author_rank: Super Contributor
timestamp: February 04, 2016, 01:08:18 am
content: CMOS CD4013BE or 74HCT4013 or 74HC4074 D-FF

author: Paul Price
author_rank: Super Contributor
timestamp: February 04, 2016, 12:15:44 pm
content: Daisy Chaining Shift '595 Registers:The Shift Registers can be increased by connecting the QH' pin with the second Shift Registers Serial in (PIN 14). Thus the number of output is limited only to the number of Shift Registers that can be connected.

author: Wiljan
author_rank: Regular Contributor
timestamp: February 04, 2016, 12:51:37 pm
content: Here is an example with 74HC595 in seriehttp://www.protostack.com/blog/2010/05/introduction-to-74hc595-shift-register-controlling-16-leds/
Flipper Zero Remake Project - Page 1
Forum section: electronics / projects

author: electronx
author_rank: Regular Contributor
timestamp: December 29, 2024, 07:38:40 pm
content: yes, i was bored and decided to rebuild flipper zero.It took me about 1.5 monthsThe funny thing is that I have never bought a Flipper Zero in my life.Please specify your recommendations and suggestions.

author: jwet
author_rank: Frequent Contributor
timestamp: January 14, 2025, 06:06:19 pm
content: That is some beautiful one off building- wow.The biggest thing that I wish that the Flipper Zero did was implement a Bus Pirate type app from the CLI.

author: electronx
author_rank: Regular Contributor
timestamp: January 14, 2025, 06:45:14 pm
content: Thanks for your feedback. I guess it's not that hard,After the PCBs arrive, I will measure the antenna characteristics.And then I plan to customize the hardware as I want

author: thm_w
author_rank: Super Contributor
timestamp: January 15, 2025, 02:07:49 am
content: Is the schematic public? I didn't immediately see it on github:https://github.com/flipperdevices/flipperzero-3d-models?tab=readme-ov-file

author: electronx
author_rank: Regular Contributor
timestamp: January 15, 2025, 05:26:55 pm
content: Yeshttps://docs.flipper.net/development/hardware/schematic

author: thm_w
author_rank: Super Contributor
timestamp: January 16, 2025, 11:05:03 pm
content: Thanks, surprised as I hadn't seen any china clones either, but it looks like they are coming too:https://www.aliexpress.com/item/1005008373332090.htmlGood work either way.
Flir A320 - Page 1
Forum section: electronics / projects

author: fred.dutrey
author_rank: Newbie
timestamp: November 22, 2015, 11:13:30 pm
content: Hello all,I got my hands on a FLIR A320 (networked). It's a 9hz version.I poked around with telnet and ftp, and of course had a look at the guts.I'm trying to get the refresh rate up to 30hz, hoping it's not hardware limited.It's driven by a winCE web server.Does anyone have any experience with this?Thanks

author: Fraser
author_rank: Super Contributor
timestamp: January 21, 2016, 04:15:32 pm
content: The A320 cannot be modified to 30 or 60fps via its communications or engineering ports. The frame rate is set in the read-out electronics, in accordance with the ITAR regulations covering the microbolometer itself.Sorry the news is not better. Nice camera though. I almost bought one a couple of years ago but close inspection of the auction pictures revealed that it had serious water ingress corrosion, possibly even the victim of complete submersion in water ! One to walk away from. I felt sorry for the person who ended up buying it 'as seen' for quite a wad of cash.Fraser
Flir Boson UART for an idiot - Page 1
Forum section: electronics / projects

author: IO390
author_rank: Regular Contributor
timestamp: December 08, 2018, 11:40:58 pm
content: Hi all,I am trying to send some commands to a Flir Boson sensor via UART. Everything is connected up and I'm sending commands with an Xmega mcu. The port is set up as per the Boson's datasheet - 921.6K baud, 8 bits, no parity and 1 stop bit.I'm new to digital. I am at the stage of being able to send bytes and the scope decodes them fine.This is Flir's IDD document for the Boson:https://www.flir.com/globalassets/imported-assets/document/boson_sdk_documentation_9hz-v11412-and-later.pdfCan anyone help me make sense of this? What actual data would I send? Can't figure it out. I have also downloaded the SDK which hasn't helped me so far.Thanks in advance.

author: Psi
author_rank: Super Contributor
timestamp: December 09, 2018, 12:04:53 am
content: That document appears to be for a library API rather than serial comms.

author: IO390
author_rank: Regular Contributor
timestamp: December 09, 2018, 12:31:41 am
content: Quote from: Psi on December 09, 2018, 12:04:53 amThanks. It would appear that I have the wrong end of the stick then, or rather the stick is not even in my hand.Where should I go from here?

author: IO390
author_rank: Regular Contributor
timestamp: December 09, 2018, 01:01:11 am
content: https://github.com/benelgiac/PyBoson3/blob/master/bosondocs/102-9013-00_FLIR_Binary_Protocol.pdfSomeone has uploaded the protocol here. That should get me started.

author: Psi
author_rank: Super Contributor
timestamp: December 09, 2018, 01:02:56 am
content: Yep, that's is what you need.
Flir lepton break out board - Page 1
Forum section: electronics / projects

author: aargee
author_rank: Frequent Contributor
timestamp: December 19, 2014, 08:24:05 pm
content: i see that Sparkfun has a Flir breakout board (which sold out pretty quickly)https://www.sparkfun.com/products/13233The price is not a bargain for this res of imager, but it is an easily accessible experimenters module.

author: Richard Crowley
author_rank: Super Contributor
timestamp: December 19, 2014, 08:36:30 pm
content: Perhaps you missed the discussion already underway at....https://www.eevblog.com/forum/chat/flir-lepton-is-now-for-sale-at-sparkfun-(with-datasheet-and-sdk)/

author: aargee
author_rank: Frequent Contributor
timestamp: December 19, 2014, 09:15:18 pm
content: Thanks, yes I did, even after searching for these specific terms in the search engine.Nothing to see here everybody, move on...
floating differential amplifier instrument cable type ? Twinax vs triax - Page 1
Forum section: electronics / projects

author: sarepairman2
author_rank: Frequent Contributor
timestamp: September 12, 2015, 10:11:33 pm
content: I have a HP8904A function generator. It has the option of fully differential floating output. It has 2 BNC connectors (center pin hi, center pin low, the shields are connected to earth ground)Is it better to use a triaxial or twinaxial cable to link things to the instrument?I.E.Shield (Earth) (outer shield)HI (center pin)Low (inner shield)vsShield (Earth) (outer shield)HI twisted pairLow twisted pairsignal to 600KHz only.impedance of amplifier output : 50 ohms
Floating power supply - Page 1
Forum section: electronics / projects

author: hyna
author_rank: Newbie
timestamp: February 26, 2018, 04:03:37 pm
content: Hello,I try to build power supply for a filament heater which will be floating at -60kV.Vin=24V Vout=24V 20-50W, ideally without a feedback, non regulated (buck with feedback will follow for a filament current regulation).I did chose a half bridge topology due to high leakage inductance of my transformer. To minimise leakage inductance i splitted primary coil to two sections and secondary is in the middle of them as in attached picture. There is a 3 mm gap between secondary and core+primary. Entire transformer will be filled with epoxy (22-25kV/mm) under vacuum. Spacing between output and input terminals of transformerafter after potting will be 60mm (1kV/mm for humid air). PCB FR4 without solder mask and with milled slot between PRI/SEC.And now the questionsDid I missed something? I have a long experience with HV as a user, but never designed something like that.Also struggling with SMPS power, my design is able to deliver only about 15W without significant voltage drop. Do you have any recomendations? (different winding technique or core?). I want to avoid a feedback, but if it will be necessarily, should i put there simple analog fibre optics (photodiode+phototransistor)?Thank you for your feedback!

author: Benta
author_rank: Super Contributor
timestamp: February 26, 2018, 05:52:25 pm
content: 60 kV acrossthat? *runs away screaming*Seriously, you should look at how CRT transformers are made with U-U cores. I think that's the only way you'll get enough separation.

author: ogden
author_rank: Super Contributor
timestamp: February 26, 2018, 06:50:57 pm
content: Quote from: Benta on February 26, 2018, 05:52:25 pmI am screaming as well!Agree that CRT flyback transformer with U-U core is way to go. Discard hi-voltage winding and make new one - low voltage, but high isolation. Flyback regulator that does not need feedback, sounds like good choice here. AFAIK CRT flyback transformers had some secondary winding for feedback or not - dunno.
Floating power supply in series with (possibly HV) earth referenced source - Page 1
Forum section: electronics / projects

author: wolf32d
author_rank: Contributor
timestamp: November 28, 2016, 04:34:04 pm
content: In our lab we have a good old Agilent E3631A. Its 6V floating output is connected in series with another mains earth referenced power supply.In other words the second power supply lifts the negative socket of the E3631A of a voltage V_lift.Here's the question:what is the maximum safe value of V_lift (I mean safe for the PS, not for the user)?I cannot find any data about the output-to-earth ground insulation

author: ajb
author_rank: Super Contributor
timestamp: November 28, 2016, 05:42:27 pm
content: 240V, according to the front panel

author: Zero999
author_rank: Super Contributor
timestamp: November 28, 2016, 07:01:31 pm
content: Yes, floating the output at too higher voltage will damage the power supply. The output will also have a fairly high capacitance, with respect to mains earth, as the output will be earthed via capacitors, which means it's not possible to float it at a high frequency.
Floating vs Diffamp - Page 1
Forum section: electronics / projects

author: ezalys
author_rank: Frequent Contributor
timestamp: September 16, 2021, 01:37:15 am
content: Why is it that instruments with differential input stages use instrumentation amps, and instruments with “differential” output stages float their outputs?Why not the reverse? Why do we not insist upon using an optoisolated input stage and a THAT1606 or similar differential driving output stage?Note, I would like to ignore all safety-reasons or “large common mode voltage” situations. Let’s suppose we’re only in situations where the common mode voltage is small relative to the rails. None of this “industrial environment” stuff.

author: ejeffrey
author_rank: Super Contributor
timestamp: September 16, 2021, 02:23:41 am
content: An instrumentation amplifier has high differential and common mode impedance and is cheap and easy and will work basically the same as a floating output.A fully differential opamp output normally has low common mode impedance. To get high impedance like a floating driver you need to use feedback to set the common mode level for zero current. This works but is hard to get high bandwidth and tends to have stability problems.Overall I would reject your premise. Plenty of instruments produce differential outputs using just a fully differential opamp or line driver. They just have low common mode impedance. Also for higher frequency isolating baluns are common on inputs and outputs.

author: ezalys
author_rank: Frequent Contributor
timestamp: September 16, 2021, 02:34:22 am
content: Ok that makes sense. Suppose I want low diff impedance and high common mode impedance. Is there a more clever way to do it than floating the DAC and reference? Is there a good way to transfer a precise voltage across an isolation barrier? Flying cap? Transformer plus rectification plus insn amplifier feedback loop?

author: Wolfram
author_rank: Frequent Contributor
timestamp: September 16, 2021, 09:55:51 am
content: It's difficult to recommend specific solutions without knowing the required bandwidth, linearity and dynamic range.
Flood Sensor Extension help... - Page 1
Forum section: electronics / projects

author: bb
author_rank: Newbie
timestamp: October 14, 2019, 12:46:09 pm
content: So i have a water / flood sensor that links into my alarm panel (winland electronics waterbug 200). I currently have two of the remote 'probes' - I want to install them in a floor / celling void to detect water leaking from a flat upstairs. My question is, if i simply connect two copper wires to the sensor terminals, running them in a kind of loop to protect a larger area will it work?Perhaps i should simply test the idea. Obviously the resistance will dictate a maximum distance, but can anyone offer a formula or advice to work out a reliable way to do something like this. Many thanks in advance.https://www.winland.com/solutions/monitoring-devices/waterbug/wb200/

author: KMoffett
author_rank: Regular Contributor
timestamp: October 14, 2019, 02:00:12 pm
content: Running parallel conductors anywhere, no loops, will work. They can parallel you existing sensors. The conductivity of the water is more important than the length of the wire to the sensors.
Flow switch circuit for water pump controller - Page 1
Forum section: electronics / projects

author: calzap
author_rank: Frequent Contributor
timestamp: March 26, 2020, 07:55:28 pm
content: Diagram and descriptive text are below. The pump is 240 VAC, pumping from pond into pressure tanks; only 1 m suction head. The 24 VAC control circuitry is non-negotiable ... a lot of existing controller and sensor parts are 24 VAC, some sensors are 10 m or more away in a electrically noisy environment, some auxiliary devices (lights, valves, etc.) are 24 VAC, etc.All relays will have surge suppressors for their coils. If you want to follow the action, start with the pressure and flow switches; then the relays in numerical order.Would like comments on problems and improvements.Mike in California====================================================================================================Pressure switch closing initiates a pump cycle. Assuming other safeties allow it, pump will start, and if water flows, flow switch should close within 2 seconds. As pressure builds in tanks, flow slows, and flow switch will open before cutoff pressure is reached. Circuit is designed to check if flow is present in the interval 2 to 4 seconds after pressure switch initiates a cycle. If flow is not confirmed, then the system will be shutdown via the latching relay and require a manual restart. After 4 seconds of pumping, flow switch plays no further role except as described below.Pressure switch has a safety pressure below cut-in pressure at which, it will do a cut-out that requires a manual reset. At very high flow rates, like use of a fire hose, the pressure may fall below the safety level. Flow switch is wired through its relay in parallel with the pressure switch in order to maintain pumping at high flows regardless of pressure.Normal operational position of the latching relay is 2. In this position, its SPST contacts are open, which means the secondary DPDT relay will not be activated. The NC contacts of the DPDT relay allow the contactor coil to operate. The closed SPDT contacts of position 2 of the latching relay allow the flow switch relay to cause the latching contacts to move to position 1 if the flow switch has not closed during 2-4 seconds of pump operation. When the latching relay moves to position 1, the latching SPST contacts will be closed, activating the DPDT relay. And change of position of the SPDT contacts of the latching relay means the flow switch relay will no longer be able to change the latching relay position until the latching relay is reset to position 2 by the reset switch. The reset switch also serves as a test switch because successive presses will change the latching relay.==================================================================================================
Fluke 187 IR cable - Page 1
Forum section: electronics / projects

author: mrjoda
author_rank: Regular Contributor
timestamp: June 06, 2016, 08:16:03 pm
content: Hi friendsI bought F187 for a few bucks so... here is my DIY fluke IR USB cable attachment.Circuit is basic connection of FTDI FT232RL with one LM393 at output/input. Powered from USB. I saw this schematic somewhere on internet but i dont have link.PCB is little bit fancy. It has 13,7x23,20mm double sided.The body of connector is 3D printed from PLA.gerbers and steps are included down.i works with flukeview form with no issues.

author: BravoV
author_rank: Super Contributor
timestamp: June 07, 2016, 02:26:38 am
content: Nice, thanks for sharing, I like the idea of the 3D printed connector body.

author: serggio
author_rank: Regular Contributor
timestamp: June 10, 2016, 06:47:57 pm
content: Disaster...Seems that people absolutely not understand schematic and just try to do copy-past solution where comparator was used for drive emitting diode and convert photodiode level.http://kimboricha.blogspot.ru/2013/12/build-usb-to-fluke-189-irinfrared.htmlNow carefully look at your schematic where you use 10k/10k R1/R3 divider. What reverence voltage you will have on inverted input on comparator? I assume that this will be 5/2 = 2,5 VAnd what role LM393 here in your schematic, when you can easy exclude it and connect your emitting and receiving diodes directly to Rx and Tx line?

author: michal82
author_rank: Contributor
timestamp: June 17, 2017, 08:51:31 pm
content: HelloAt what wavelength did you use the transmitter and receiver.800nm, 880nm or 950nm?

author: serggio
author_rank: Regular Contributor
timestamp: June 17, 2017, 09:09:57 pm
content: 950 will work, 880 will work, don't worry about it
Fluke 289 battery voltage - Page 1
Forum section: electronics / projects

author: MatVer
author_rank: Newbie
timestamp: October 21, 2023, 07:32:15 pm
content: Hello I recently got a Fluke 289 multimeter but I use it so much and I would like to make an adjustment with a li ion battery. But I have a question: what is the necessary battery voltage that the multimeter (fluke 289) must have to be able to use it fully? Kind regards, Mathis Verschueren

author: bdunham7
author_rank: Super Contributor
timestamp: October 21, 2023, 09:00:23 pm
content: I think you'll be OK from 6.6 V on up, that's good for a 2S Li-Ion setup. However, if you want rechargeable without modifying the meter, just get AA NiMH or the USB-chargeable Li-Ion AA replacements. I use Eneloop NiMH and it uses most of their capacity by the time the battery warning comes on. I have a 12-pack of these just for the meter and I keep one set charged for when it is time to swap.

author: MatVer
author_rank: Newbie
timestamp: October 21, 2023, 09:13:23 pm
content: You can also use the meter with NiMH batteries for about 100 hours, because that would be ideal, then you leave them charged and you can continue
Fluke 28II boost conversion question - Page 1
Forum section: electronics / projects

author: rvalente
author_rank: Frequent Contributor
timestamp: August 21, 2015, 05:30:56 pm
content: Dear Friends,Whatched the old Fluke 28II review and teardown from Dave and got curious, which boost conversion Fluke engineers chosen to boost the Fluke 28II?Does the rotary switch completely shuts the circuit off? What about ripple and noise from this guy, how does that affect the ADC?If anyone knows the partnumber or have the datasheet, please let me know!Greetings
FLUKE 5100B up to 19.999V ac and dc only. please help. - Page 1
Forum section: electronics / projects

author: clexzzz
author_rank: Newbie
timestamp: November 02, 2017, 09:19:35 am
content: Hi good day,i have some question about fluke 5100B. So far we can only use it up to 19.999V ac and V dc. When we try it 20V and up and press OPT, the display says OL. Can you please help us. Thank you. Sorry for my english.

author: Simon
author_rank: Unknown
timestamp: November 02, 2017, 06:45:03 pm
content: If you triplicate post again you will be banned!
Fluke 620 LAN Cablemeter Remotes - Page 1
Forum section: electronics / projects

author: linkrunner
author_rank: Newbie
timestamp: December 04, 2018, 07:58:10 pm
content: I have a couple of these LAN Cablemeters with no remotes. I hope that someone may have these, and would be willing to take some measurements, as the pin outs previously shown here for the 683 model does not work for this model.In experimenting with these, one thing that I have noticed is the fact that the 180.7K resistor across pins 1 & 2 will show "No Cable." Other values, both higher and lower will read as an impedance error.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 20, 2024, 01:56:05 pm
content: Did you ever find out how they are made ?I have some x-ray images of the ID.Benno

author: BennoG
author_rank: Frequent Contributor
timestamp: August 19, 2025, 08:12:26 am
content: I finally got the time to cut my identifier open and reverse engineer the part.Made a kicad 9 project with exact the same layout as the original PCBNext steps, figure out the resistor values of the other ID's without cutting them open.I have also added some photo's of the ID 2 I cut open.Edit:The identification is done with R7 and R9R7 R9ID 1 1k05 or 1k02 4k53ID 2 1k18 5k11ID 3 1k37 or 1k40 5k76ID 4 1k58 6k49Benno

author: BennoG
author_rank: Frequent Contributor
timestamp: August 29, 2025, 11:42:37 am
content: Resistor values (id 1 - 4 confirmed id 5-8 test in a week)R7 R9ID 1 1k02 4k53ID 2 1k18 5k11ID 3 1k37 5k76ID 4 1k58 6k49ID 5 1k82 7k32ID 6 2k10 8k25ID 7 2k43 9k31ID 8 2k80 10k50KiCad files are also attached.2 different versions only difference is the RJ45 connector type.

author: Cyberprog
author_rank: Newbie
timestamp: September 08, 2025, 11:45:54 am
content: Hi Benno,Do you plan on selling these? I'd be interested in the 5-8 dongles (I already have 1-4) and maybe a full set if the price was right. My 620 has been a great workhorse and I've yet to find anything better at the price point!Alexis

author: BennoG
author_rank: Frequent Contributor
timestamp: September 08, 2025, 07:40:01 pm
content: I have calculated the cost they are about 7 euro each. (that is including the prototyping cost divided by the last batch count)the main problem with UK shipments would probably be the customs and shipping from NL to UK.I made 4 complete sets 1 was for my brother and 2 for myself (yes I have 2 fluke 620 meters 1 in the car and 1 at home)I have a complete build set, and parts to build 12 extra dongels. So I can build 4,6,7 and 8 for you.Do you want 3d printed housing on it or just the assembled boards with RJ45 connector.

author: Cyberprog
author_rank: Newbie
timestamp: September 09, 2025, 06:42:38 pm
content: I have my own print farm so if you can send me the STL's I can print thoseThat would make it easier, so just assembled boards will be fine.I think we'd be under the customs value anyway for any hassle. 7eur each sounds fine, just let me know what shipping will be and how you want money lol
Fluke 650R Remote schematic  - Page 1
Forum section: electronics / projects

author: Squire_
author_rank: Newbie
timestamp: April 14, 2024, 10:49:50 am
content: So I have fluke 650 cable meter:but im missing the "remote" as fluke calls it,So Anyone know where to find or have a Fluke 650R remote, I'm looking for a schematic to build one, buying a replacement is a bit too expensive for me to do

author: AintBigAintClever
author_rank: Regular Contributor
timestamp: April 20, 2024, 01:12:26 pm
content: I guess it was you who asked on my teardown video650R Remote schematic, hot off the press and hopefully correct:https://drive.google.com/file/d/1cGlGGGBPzsRVcUS_0h8CplVbqkPzuMIK/viewThose are latching DPDT relays with one coil to set and another to reset, they'll probably be the trickiest parts to obtain, but not impossible. The DAP801 could just be replicated with half a dozen 1N4001s.If you don't want to mess around trying to fit an RJ45 jack on a 0.1" stripboard or breadboard, just use a short patch cable, cut it down and use an inline coupler. If etching a board you'll definitely want to prototype it first in case I've missed a track.EAGLE file attached to this reply, just rename it back to a .sch file.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 20, 2024, 01:40:55 pm
content: Nice I have a fluke 620 coming my way.I want to figure out how the 620 ID works.Benno

author: Squire_
author_rank: Newbie
timestamp: July 10, 2024, 08:36:37 pm
content: haha yessir it was!I was thinking of using the following relay and adjusting the traces/wiring accordinglyHongfa HFD3-12-L2Signal Sub Mini Sealed-2 Coil Latching Relay Form 2C (2c/o) 12VDC 720/720 Ohm Coil 2A 30VDC 0,5A 125VAC (4A@220VDC/277VAC Max.) - Gold Flash Contactshttp://archive.communica.co.za/Content/Catalog/Documents/D1482213408.pdforHFD31-5-L2-SRhttp://archive.communica.co.za/Content/Catalog/Documents/D0970510591.pdf
Fluke 8012A - No AC Reading - Page 1
Forum section: electronics / projects

author: rstor22
author_rank: Regular Contributor
timestamp: July 10, 2015, 11:53:31 pm
content: I purchased a used Fluke 8012A today. DC voltage/current, and ohms read ok. When testing AC it indicates over range for all ranges.Would the U8 true RMS converter (see attached picture) be the sensible place to troubleshoot?

author: rstor22
author_rank: Regular Contributor
timestamp: July 11, 2015, 02:51:27 am
content: I believe my LM3046N is bad. I tested it in circuit, was unsure, however after reading:https://www.eevblog.com/forum/repair/fluke-8050a-true-rms-u32/25/?wap2I decided to remove the 3046 and test out of circuit.PIN 13 (Emitter) + to PIN 14 (Collector) - reads approx. 30 mega ohms. Diode check of emitter (PIN13) to collector (PIN14) reads .626V.Therefore I would take it that the transistor is bad within the 3046?The data sheet for the 3046 indicates:"The collector of each transistor is isolated from the substrate by an integral diode. The substrate (terminal 13) must be connected to themost negative point in the external circuit to maintain isolation between transistors and to provide for normal transistor action."So I am unsure of the readings for PIN 13 and PIN14 above are normal?Unfortunately I was unable to desolder the 3046 (do you have to do something special as this is a hybrid ceramic board?) and decided to cut the legs and in the process lifted some pads...

author: rstor22
author_rank: Regular Contributor
timestamp: July 11, 2015, 02:58:22 pm
content: I checked my Fluke 8050A which has a similar hybrid ceramic. Diode check of emitter (PIN13) to collector (PIN14) reads .626V for the LM3046 however resistance shows open between these pins.Would it be safe to conclude that the 38 mega ohms reading from PIN 13 (Emitter +) to PIN 14 (Collector -) for the LM3046 in my Fluke 8012A indicates it is bad?

author: rstor22
author_rank: Regular Contributor
timestamp: July 12, 2015, 02:32:37 pm
content: My local electronics surplus store had a 8010A for parts that I was able to get for cheap. The '3046 [U8 board] in the 8010A also had a high resistance reading (when tested in circuit) as described above for the 8012A so I am thinking it was another component on the U8 board which was bad.I ended up removing the U8 from the 8010A parts unit and installing it in the 8012A and now AC measurements work.

author: GreyWoolfe
author_rank: Unknown
timestamp: July 13, 2015, 11:32:54 am
content: Congrats on the repair. Enjoy the meter.
Fluke 8050A Display Upgrade - Page 1
Forum section: electronics / projects

author: kelchm
author_rank: Regular Contributor
timestamp: January 27, 2018, 08:27:00 pm
content: I will be using this thread to track progress on my Fluke 8050A display upgrade project. This is really my first project of this sort. While I've tinkered with Arduinos from time to time and have a basic understanding of electronics, I wanted to take on a project that would force me to learn new things, particularly around embedded programming and driving LCDs.The idea of replacing the 8050A display with a graphical TFT isn't a new idea and has been done several times over (1,2,3) already. Iwillbe putting my own spin on it by using a 2.4" LCD rather than the 2.2" that has been used in the past. It's a tight fit, but I think the end result will be worth the effort.At this point I've made some initial selections for hardware. I've decided to go with a Newhaven DisplayNHD-2.4-240320CF-CSXN#-F. This is a sunlight readable TFT with a resolution of 240x320 and a maximum brightness of 1000 cd/m2. For the microcontroller I've settled on a Teensy 3.5 for it's capable CPU, large amount of IO and 5V tolerant digital inputs.

author: kelchm
author_rank: Regular Contributor
timestamp: January 27, 2018, 08:29:30 pm
content: Just getting started with connecting up the display. This is my first time ever breadboarding anything. I waswaytoo excited just to get the backlight to turn on.Also quickly realizing that I'm going to need more than one bench power supply to complete this project.
Fluke 8050A will not read voltage - Page 1
Forum section: electronics / projects

author: GrievousAngel
author_rank: Contributor
timestamp: November 27, 2012, 05:42:04 pm
content: Hello All:My Fluke 8050A will read resistances but will not read voltages, DC or AC! The voltage levels displayed are always near zero with no difference when I switch between AC or DC. All fuses are OK.Any ideas? I read to check R2 but it's in the path of all measure signals, in the front end after the input probe (red).Thanks for your help,William

author: ModemHead
author_rank: Frequent Contributor
timestamp: November 27, 2012, 07:28:52 pm
content: I assume you have the service manual and schematics?Set the meter to the 2V DC range and apply 1V to the inputs. Find TP6, which is under the aluminum/plastic shield on the bottom of the PCB. Measure TP6 with respect to the front panel COM jack. It should be 1V. If not, there is a fault before TP6, which includes RT1, R3, and a lot of switch contacts.

author: c4757p
author_rank: Super Contributor
timestamp: November 27, 2012, 07:55:59 pm
content: Oh god, the switch contacts, I didn't even consider that. I've got a working 8050A and the switches look like an absolute nightmare to troubleshoot. Not to mention that if they need replacement, that type seems to be almost impossible to find, despite the large amount of test equipment (not just Fluke) from that time that used identical switches.
Fluke 80T-IR Infrared Temperature Probe Teardown - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: March 18, 2022, 08:40:50 am
content: here is a new one : Fluke 80T-IR Infrared Temperature Probe Teardownit is amazing how much electronics, and mechanics there is inside this wonderhttps://youtu.be/xwHccAn5W2cas something new, i tried to high-speed video the mowing shutterhope you like it

author: nowlan
author_rank: Frequent Contributor
timestamp: March 18, 2022, 12:41:46 pm
content: Did you fix it with a loose wire or not?

author: oz2cpu
author_rank: Frequent Contributor
timestamp: March 18, 2022, 01:37:45 pm
content: nope, but at least it reads room temperatureits IR sensor or the first amp for it, must be broken
FLUKE 87-5 DMM Accessory..Made In Greece - Greek Patent !!  - Page 1
Forum section: electronics / projects

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: April 28, 2010, 08:48:07 pm
content: Set of pictures .By Kiriakos Triantafillou Volos - Greece ..

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: April 28, 2010, 09:03:13 pm
content: If any one shares my fear that the New holster of the 87-5 (87V) ,that it looks and feels like to be ready to flip over, due poor design ...By looking the above pictures , you can be aware of, what you need to do as correction.The plastic part , its part of one machine that is used to cut grass , the ones with the rotating string .Actually its the round shield of it .Its from the hardest unbreakable plastic .Found it accidentally, same color as the Fluke, the transformation - construction took as two hours,but it worthed it ..The DMM become sturdy as a Rock ... this patent has zero impact as damaging factor,the holster clips on it , with out pressure or force ,and the only must do , are the slot to have an accurate length, with minimum free play.Now you can congratulate me.Dave I do not have a second one

author: saturation
author_rank: Super Contributor
timestamp: April 28, 2010, 09:52:23 pm
content: Great job! You take very precise photos.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: April 06, 2011, 01:18:06 pm
content: If any one has any similar ideas , post them here.

author: Unknown
author_rank: Unknown
timestamp: April 06, 2011, 01:27:25 pm
content: Good work Kyriako!Another idea would be to have at the lower end of the back stand two retractable pins that open up to form a similar stand that Kyriakos came up with. This will allow this accessory to be part of the DMM's stand.Another alternative would be two have two layers of back stand mounted on a pivot point. To deploy the DMM you lift the back stand, then slide the two layers apart to form an inverted Y.Alex

author: Mechatrommer
author_rank: Super Contributor
timestamp: April 06, 2011, 01:29:58 pm
content: Quote from: Kiriakos-GR on April 06, 2011, 01:18:06 pmno cant. its patented already. look at the topic!

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: April 06, 2011, 01:44:35 pm
content: Well Alex , I would prefer to see something all ready made. ( pictures)Quote from: Mechatrommer on April 06, 2011, 01:29:58 pmYou you you you ......I had offer my idea directly to Fluke , as gift for their positive response ,on my issue ..Who knows , possibly it can become this accessory as another freeby in the Fluke boxes in the future.

author: Unknown
author_rank: Unknown
timestamp: April 06, 2011, 01:50:04 pm
content: Quote from: Kiriakos-GR on April 06, 2011, 01:44:35 pmYeah yeah, but that would require designing and CNC-ing parts. It's the same principle as your idea, just integrated on the back stand.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 26, 2011, 01:04:41 am
content: All pictures replaced with healthy ones, the original files was damaged from the latest server update.
Fluke 97 LED backlight conversion - Page 1
Forum section: electronics / projects

author: mlefe
author_rank: Regular Contributor
timestamp: February 27, 2019, 07:31:34 pm
content: I've recently acquired a Fluke 97 from eBay and, like many of you noticed mine also had a very dim backlight.I've decided to do something about it and, after reading what joeqsmith did to his (thanks for the info!), I ordered the same EL panel he got.After installing it, I wasn't convinced on the result so I took a different route: I reused a broken LCD monitor panel from a notebook (both the different sheets and smd LEDs).I've tried several options to run the LEDs (several configurations in parallel and series with different rails within the scope)… but the one that finally did the trick was:* Cut a suitable sized of the LCD monitor to fit where the EL panel was and retrieve the full LED strip from it* Separate 10 LEDs from the strip, cut them and put them back together in series on top of a piece of Kapton tape* Take the backlight signal and use a 2N3906 to enable a TIP122 to provide power from the -30V rail to the LEDs* Try to don't make a complete mess with the wires, hot glue and tape inside the scopeIn the end, I'm very happy with the results, although I'm sorry for the quality of the pictures and the wires and mess, I didn't have the confidence that it would work..The image with the backlight looks a bit overexposed in the bottom in the picture, but it's not noticeable in real life and looks good and bright.I hope this gives you some alternative ideas

author: InnocentBystander
author_rank: Newbie
timestamp: November 18, 2024, 04:10:30 pm
content: Hi there, thank you very much for this idea!It's been a while since you posted it, and when one these Fluke97 scopes crossed my way recently, no suitable EL foils could be found anymore; and if there were, the space underneath the display never was enough to fit in a contact ... soldering on these plastic sheets is impossible, of course.Question: Would you be so kind as to help me with some details where you connected the LED strip to? In your drawing you connect the switch circuitry between -8.17V and GND, in your text you write about a -30V rail. Can you tell me where to solder them to?