hybridfree/eevblog-posts huggingface dataset:
Solar Panel and SLA - Page 1
Forum section: electronics / general

author: aaron
author_rank: Regular Contributor
timestamp: September 04, 2014, 06:32:17 am
content: Hi guys,Just thought I would get some expert opinions...I have a 7.2Ah SLA Battery, and I'm after a solar panel to keep it charged up. It's for an outdoor system, and it's all going to be sealed away in a metal box. (Excluding the solar panel of course...).I was thinking of this one:http://www.jaycar.com.au/productView.asp?ID=ZM9094as it's east to go buy, and has a warranty. I was going to use a cheap 10A/12/24V Charge controller from eBay to control the charge. This is just a quick battery job for an outdoor gate actuator, probably used at most 6 times a day. (3x Open/Close).Thanks a lot for any input in advance.

author: Simon
author_rank: Unknown
timestamp: September 04, 2014, 06:42:26 am
content: A battery is a battery and a solar panel is a solar panel, no one can tell you if that particular model is better or worse, if you want help sizing things up power wise you need to give us some figures.

author: Electrical50
author_rank: Newbie
timestamp: September 15, 2014, 08:05:56 pm
content: Hi,Before installation, Check this post with Step by step installation of PV with Battery and Inverter with proper rating...Solar Panel Installation Guide

author: fww
author_rank: Contributor
timestamp: September 16, 2014, 08:52:33 am
content: To establish a stable solar power supply system, also need to provide following parameters:The voltage of SLA Battery:12v or 24v? the battery is a new one?The power of solar panel;Local average illumination time and the local latitude.The load's power and the time of be used.Supply voltage of the load. Or directly connected to the battery?---more information is welcome.Also note that some maintenance ways about SLA battery, the direction and angle of the solar panels .

author: SeanB
author_rank: Super Contributor
timestamp: September 16, 2014, 07:13:31 pm
content: Buy a Centurion gate motor, as they have a solar option on the control panels, and have both the panels, the charge controllers and the larger battery typically used in these systems.If it is an existing gate controller check the current drawn by the controller with the mains disconnected, and then the operate current of the unit. Typically you have a 30 to 100ma draw with it in standby ( depending on the remote receiver and the relay for the light being energised for 5 minutes) and 10-20A in operation. You need to have enough capacity in the battery so that you do not draw more than half the capacity if there is no sun for 3 days and you operate the gate 10 times. Typically you need more than 7.2AH, more like 16 to 20AH. Your panel should be able to charge it from flat in 8 hours, so a panel that delivers 20W will be a little undersize, but 2 in parallel will work with a simple charge controller to charge the battery and maintain it.

author: VincenzoGregorich
author_rank: Newbie
timestamp: October 23, 2014, 06:33:10 am
content: Quote from: SeanB on September 16, 2014, 07:13:31 pmPlenty of thanks for your advice..Well I was in bit old dilemma but I think your post will now help me out..
freeOPV free flexible organic printed solar cells. - Page 1
Forum section: electronics / general

author: Legit-Design
author_rank: Frequent Contributor
timestamp: June 24, 2014, 08:55:46 pm
content: Didn't see separate discussion about thesehttp://thinkprogress.org/climate/2014/06/23/3451684/future-of-solar-technology/http://www.rsc.org/chemistryworld/2014/06/roll-roll-flexible-organic-tandem-solar-cellsI just ordered mine fromhttp://plasticphotovoltaics.org/free-opv.html,yes you have to register to courseraif you don't have account but coursera is awesome tool for learning (I hope, only have experience from edx).Interested to see what kind of real performance could get out of these free postcard sized solar cells. I hope I actually get one, you never know with these free deals.Their current designhttp://www.plasticphotovoltaics.com/free-opv/opv-current.htmlQuoteDoesn't sound too bad considering can get these for free.Does anyone have one and has done some tests on it? Like how much actual power should one expect while in sunlight?

author: Legit-Design
author_rank: Frequent Contributor
timestamp: June 25, 2014, 05:39:42 pm
content: These don't seem totally useless if they can power small motor.http://plasticphotovoltaics.org/images/T-freeOPVs%20certificate_CLOP_signed.pdfTells surface are on one of their better cells. Tandem cells have higher efficiency.Quote from:http://plasticphotovoltaics.org/free-opv/free-opv-faq.htmlSo active area is 52,2 cm², or 0,00522m² if sun shines 1000W/m² and efficiency is 1%.we get 0,0522W or 52,2mW0,006525A or 6,525mA if the cell is ~8VI think I can reasonably expect to get half of that.

author: eneuro
author_rank: Super Contributor
timestamp: June 25, 2014, 07:48:20 pm
content: Quote from: Legit-Design on June 25, 2014, 05:39:42 pm1000W/m2 according to Bird Clear Sky model is dificult to get from the sun and only on specific sun hours on clear sky, especialy in Europe,so it is very optimistic input solar powerI'm looking for flexibe PV for my HPV electric vehicle but 1% is so small that it is useless in this EV project while about 250W is needed including human power.
Open Source RF Signal Generator up to 22.6 GHz - Page 1
Forum section: electronics / general

author: sydundar
author_rank: Contributor
timestamp: September 28, 2025, 04:33:43 pm
content: If you’re interested, you can check out my open-source RF signal generator project, with both hardware and software fully available. If you’d like to support it, the campaign is now live on Crowd Supply.https://www.crowdsupply.com/atek-midas/dsg-22-6-ghzhttps://github.com/sydundar/atek_dsg_22GHzLooking forward to hear your thoughts.

author: bostonman
author_rank: Super Contributor
timestamp: September 30, 2025, 01:00:13 am
content: That looks great!I haven't a need for something like this, however, over the years I thought it would be good to have a function generator that goes beyond the 20MHz one I have.If I may make a few suggestions, how about a sweep function where you set the start/stop and maybe the time to sweep. Also, allow for setting amplitude in other units (possibly just a drop down menu and the math is done in the background).

author: JoeMeta
author_rank: Newbie
timestamp: October 03, 2025, 02:11:01 pm
content: As somebody who works in the satellite telecom industry, it looks like a very promising product. We currently buy something similar to this to retrofit into old equipment which has failed analog LO generator segments.You ought to offer a basic open source 10MHz OCXO module in parallel so that people can purchase the complete solution from you.

author: sydundar
author_rank: Contributor
timestamp: October 06, 2025, 06:56:52 pm
content: Thanks for the comment. Yes we will add sweep feature but your offer having different amplitute for each freq point doe makes sente to me, if i understood correctly.

author: bostonman
author_rank: Super Contributor
timestamp: October 06, 2025, 10:02:22 pm
content: The sweep function may be a nice feature. I'd also include sweep time. The function generator I have will sweep from X to Y in Z seconds, but, one thing I dislike: it starts X to Y, and, when finishes, starts from X again. I'd like to see it go X to Y, Y to X, X to Y, etc...As for "units", what I meant is: in order to enter amplitude, the units need to be in dBm (the image shows 15).It may be a nice feature to have Vrms, Vp-p, etc...This way instead of entering the value in dBm, the user can enter 1Vrms instead.Also, I don't know if you will keep this open source, but maybe some users would be interested in purchasing one already built. Possibly consider selling them as a whole in the future.

author: Songhua
author_rank: Contributor
timestamp: October 13, 2025, 02:17:25 am
content: Good job.Can it load user defined waves?If it can, what is the format of the wave file and what kind of wave can be imported?E.g. load some pre-defined waves captured from oscilloscope.

author: Cyclotron
author_rank: Unknown
timestamp: October 13, 2025, 03:10:22 am
content: Looks cool, any idea when it will launch?
Big news! 🎉Openterface KVM Ext. for uConsole  is certified by OSHWA！ - Page 1
Forum section: electronics / general

author: TechxArtisan
author_rank: Newbie
timestamp: August 29, 2025, 02:46:41 am
content: ✅OSHWA Certification provides an easy and straightforward way for producers to indicate that the products meet a uniform and well-defined standard for open-source compliance.Big thanks to our amazing community and open source contributors.Excited for tech fans to share feedback, toss around ideas, and help grow this project together!🥳﻿Check Out Our Openterface's Certification﻿https://certification.oshwa.org/cn000021.html

author: Fixpoint
author_rank: Regular Contributor
timestamp: September 19, 2025, 01:15:26 pm
content: This "OSHW certification" stuff is nonsense. A project is made open source by releasing it under an open source license. "Certification" is neither required nor involved.If you want to make open source hardware or software, just choose an open-source license and you're done. You don't need any approval by any political organization.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 19, 2025, 01:19:11 pm
content: Of all the things I care about in a product, this is very low down - how many other actual improvements could have been made with the effort involved

author: TechxArtisan
author_rank: Newbie
timestamp: September 19, 2025, 05:23:48 pm
content: Totally agree an open-source license is the core part. For us, OSHWA cert isn’t about “getting permission,” more like a quick way to show we actually shared the files. Plus, the OSHWA folks at least cared enough to check them in a proper, non-profit way.Kinda like a driver’s license: you can drive without it, but having some serious procedure to check makes things clearer. 😄 In the end, real tech folks and time will judge how open it really is. Well, I’m committed to work on itAnd it would be greet if we have your support and help keep us on track! Cheers!

author: Smokey
author_rank: Super Contributor
timestamp: September 19, 2025, 09:45:45 pm
content: Quote from: TechxArtisan on September 19, 2025, 05:23:48 pmJust like the "CE" marking on all the Chinese products is proof they are all legit CE Certified right?

author: TechxArtisan
author_rank: Newbie
timestamp: September 20, 2025, 01:58:47 am
content: Haha, good one! CE has its value, but folks here know how those mysterious marks really work. 😅 Good or bad products can come from anywhere. Well, staying on the good side’s always a challenge. We just keep pushing to be there. 😉
OSHW TFT mod for the original Game Boy (DMG-01) - Page 1
Forum section: electronics / general

author: DerTobi
author_rank: Newbie
timestamp: April 17, 2025, 09:04:44 pm
content: I just released an open-source TFT mod for the original Game Boy (DMG-01), powered by the Raspberry Pi RP2350B.Hope you like it.FeaturesRP235xB Microcontroller – Affordable, accessible alternative to FPGA solutions.Custom PCB – Minimal case mod needed.2-Layer PCB – Cost-effective (ENIG recommended).3.2" TFT Display – Pixel-perfect, used area matches original size.Backlight Control – Flicker-free dimming (no PWM).Multifunction Switch – Replaces contrast wheel; handles UI navigation.Battery Monitoring – LED, battery warning icon, adjustable settings.On-Screen MenuDisplay Modes - Scanlines and Pixels(experimental)Game Detection – CRC32-based title screen detection via DMA for auto palette selectionPCB design supports different displays and fast modification.3D-Printed Frame for the TFT moduleMore info:https://www.embedded-ideas.de/posts/250417_open_dmg_display/

author: Brociall
author_rank: Newbie
timestamp: September 15, 2025, 11:25:22 am
content: Quote from: DerTobi on April 17, 2025, 09:04:44 pmWow, thank you. It looks great, I can't wait to try it.
Bi-Directional (AC or DC) LV & ELV Current Limiter - Page 1
Forum section: electronics / general

author: marks2c
author_rank: Contributor
timestamp: September 13, 2025, 07:30:10 pm
content: 2.5 mA Current Limiter for LV and ELV Voltages(800V rated withstand)Circuit:Back-to-back depletion mode MOSFETs with resistor/Zener gate protection against transients. The current limit is set by the transistors' gate characteristic and the value of R1 (1k = ~2.5mA).Construction:Soldered components onto PCB and added two back-to-back LEDs in series for visible indication/load.Testing:9V BatteryWorks off 9V battery (measured ~2.5mA):480VAC using a HiPot Tester:Survives 480VAC for 30s. Still ~2.5mAThermal:Looks great after 480V for 30s (ambient ~20C).1kV from Insulation Tester:Survives a 1kV insulation tester no problem (~1mA current limited).800VDC from HiPot Tester:Survived 30s test.Transient Performance 500VDC:Current is yellow trace measured across a 6.4 Ohm resistor, 5V/div.Applied voltage is blue trace 100V/div.The ringing is due to the inductance and stray capacitance of the test leads (HiPot, 2P-MCB, etc). Note that the current pulse is occurs and is gone before the full voltage is applied. Likely this is charging the stray capacitance in the test set-up, and not actually passing through the current limiter itself.Assuming the worst (all current is passing through the limiter), so at 500V is 40V across 6.4 Ohms = 6.25A peak that has been and gone inside 10ns.(hat-tilt to SMath).The important consideration is let through i²t:0.36 µA²s is trivial (each Ohm of resistance in the circuit will absorb (fast = adiabatic heating) 0.36µJ during the pulse).ConclusionThe bi-directional ~2.5mA current limiter works well, is fast and is robust.

author: tooki
author_rank: Super Contributor
timestamp: September 13, 2025, 09:11:31 pm
content: Unfortunately the inline images are not appearing. Chances are your host does not allow image embedding.Please upload them here as attachments (so they don’t disappear in the future when your image host goes under).
LED demonstrator board with selectable current, up to 13 LEDs - Page 1
Forum section: electronics / general

author: hanakp
author_rank: Regular Contributor
timestamp: September 12, 2025, 01:42:35 pm
content: Short version:I'm attaching design files for a board that can demonstrate up to 13 LEDs at various currents. The files are from Eagle 9.6.2 and contain latest revision with several fixes and improvements. Use it for whatever you wish.Long version:A few months ago, I bought 11 full reels ofvariously colored 0603 LEDs on Aliexpress. But their brightness widely varies, so I needed something to easily demonstrate them at several currents. Not only for myself, but also for colleagues who use them for sundry development and experimental boards. Naturally, it became a prime opportunity for some over-engineering.I designed a demo board which can hold up to 13 LEDs, both SMD and THT. It's powered via standard USB-C connector and should work with all "dumb" and "smart" USB chargers. The LEDs are connected in series string;LT3591 switching LED driveris used to step up voltage for them. There is a 3-throw switch that allows you to choose between currents of 0.5, 2 and 5 mA, but these can be easily changed by a few resistors. Note that CTRL input on LT3591 is nonlinear in practice, so different control voltages are needed than expected from the datasheet. Also, CTRL voltages below 0.1 V put the converter into sleep mode, so only 1:15 current ratio is (theoretically) attainable. Because USB chargers have large output voltage tolerances, the dividers are powered from TL431 reference. I built 5 of these demo boards and their actual LED current varied about +-5%. It also depends on how many LEDs are connected in the string.LT3591 comes in a package that's rather difficult to solder by hand, but it can be done. Note the solder mask for IC exposed pad is extended to surrounding capacitors. I heated their pads with soldering iron until the heat spread under the IC and the exposed pad got soldered to board. You'll need to set high iron temperature, I used 400 deg. C. Then I soldered the 8 surrounding pins. Of course, you can also use the ol' good solder paste and heat gun method or have the board assembled in JLCPCB and the like.Another juicy over-engineering opportunity was LED storage, becauseobviously,boring standard black reel standjust wouldn'tdo. We're using 3D-printed wall-mountedDIN rail holders from this linknow. And of course, the holdershad tomatch the LED colors. We actually bought several new filaments for this purpose, but some colleagues don't care about colors of their 3D-printed objects, so they all got used up in the end.In case you're wondering about color order I'd chosen, it's because there are composite colors like white and pink. So the LEDs are ordered by color perception, which iscommonly used in paint shopsand the like. Some parameters stickers are missing in the photo, becauseI'm still tryingto determinereal LED part numbers.
Intelligent power LED driver -- LampOne - Page 1
Forum section: electronics / general

author: d-el
author_rank: Regular Contributor
timestamp: July 21, 2025, 11:45:30 am
content: An idea came up to develop a reliable lamp with high-quality light. For this, I came up with the requirements for the driver:smooth light turn-onparametrization maximum currentexternal interface controlsmooth level by bottonsave last lavuetemperature compensation currentULVOFor this designed hardware.Driver is firmware loop Boost DC/DC, schematic:Assembled PCB:The LED current is controlled by a PI regulator.To provide a large dynamic range of current setting, a software delta-sigma modulator is used.The modulator value is calculated each PWM period. The PWM bit depth is approximately 9 bits, the delta-sigma modulator bit depth is +7 bits.I noticed that when warming up the microcontroller from room temperature to operating temperature, the ADC gain drifts by about 1 bit.To compensate for this effect, I made a dynamic zero calibration. The ground channel is digitized along with the signal channels.The ground channel value is subtracted from the signal channels.This approach improved stability at low currents, around 1 mA.Cree CXB2530-0000-000N0HU440G (CCT 4000K, CRI min 80, Flux 3955, IF = 800 mA).Driver configured to 1000mA maximum current and 75°С temperature threshold.Temperature compensation (It is very convenient to conduct testing having RS485):Six lamps were made and installed in my garage. They have been working for two years already. The smooth switching on pleases.Final driver characteristics:input voltage: 6 - 26 V, (for full power recommended 24 V)output current 0.01 - 1.5 Apower: up to 60 Wsave settings to flashRS485 ModBus for calibration and controllink to design files, source code and photohttps://github.com/d-el/LampOne.

author: thm_w
author_rank: Super Contributor
timestamp: July 21, 2025, 10:01:51 pm
content: Nice work, from the link:QuoteI've not seen U1 used like that, why did you think to do it?

author: John B
author_rank: Frequent Contributor
timestamp: July 21, 2025, 10:52:55 pm
content: Nice work. This would be a perfect project to share in the home automation section that is being proposed.

author: d-el
author_rank: Regular Contributor
timestamp: July 22, 2025, 12:26:50 am
content: Quote from: thm_w on July 21, 2025, 10:01:51 pmI couldn't find a low cost gate driver in a small package so I used an analog multiplexer.I've seen several similar examples of this before.

author: d-el
author_rank: Regular Contributor
timestamp: July 22, 2025, 12:29:25 am
content: Quote from: John B on July 21, 2025, 10:52:55 pmIt's probably better to move it. I understand that a moderator can do this?

author: John B
author_rank: Frequent Contributor
timestamp: July 22, 2025, 12:35:21 am
content: Quote from: d-el on July 22, 2025, 12:29:25 amWell, it's a proposed section and doesn't yet exist, but you can certainly add your input here to keep the interest going :https://www.eevblog.com/forum/news/section-for-home-automation/
LT4320 PCB - bridge drop in replacement - Page 1
Forum section: electronics / general

author: seavan
author_rank: Contributor
timestamp: May 29, 2025, 03:05:58 pm
content: I could not find a good open source pcb for an lt4320-based rectifier, so I decided to take an opportunity to learn KiCad and make a rectifier bridge drop-in replacement. I used to make pcbs with nail polish many years ago, this is my first attempt at using "proper" tools. I will appreciate your feedback.https://github.com/mstolpner/lt4320-bridge-drop-in/tree/main

author: eugene
author_rank: Frequent Contributor
timestamp: May 30, 2025, 01:44:41 pm
content: When posting a project publicly, it is good practice to provide a schematic in a .pdf file. I would also provide an image of the layout that doesn't require downloading the entire project and loading into KiCad to look at. I typically put the layout on the second page of the schematic.

author: seavan
author_rank: Contributor
timestamp: May 30, 2025, 03:51:26 pm
content: Thank you @eugene. I have updated github with pdf and images. Posting them here for convenience:
LiFePO4 12V DC INVERTER TO 230V AC - Noise on input rails - Page 1
Forum section: electronics / general

author: Gebrey
author_rank: Newbie
timestamp: April 14, 2025, 06:41:46 pm
content: Hallo everyone,I have a NANO V3 (chinese arduino nano clone) that can't work properly (supplied with 12V DC) when INVERTER is on, idle or load doesn't matter. With a scope analysis, I found that 12V DC INVERTER PURE SINE WAVE 2500W/5000W PEAK, that makes a beautiful sine wave on AC, make a very intense (2.5-5Vpp) HF noise on input rails (up to 60MHz).I'm trying two things:- operate on input connection of INVERTER to stop the noise at origin- operate only on arduino nano board andbrelative 12V DC connectorsFERRITE BEADS ON INVERTER: counterproductiveSomeone suggested ferrite beads. I lucky had already got the perfect bead (30x30 15mm inner d) exactly for my 70mmq 12V+ wire that goes to inverter. Well, in idle mode nothing happens at all (in scope). In load mode, the inverter, that still works flawless, start to make an audible resonant noise (like 400~Hz). A bit scary but I doubt to have damaged it* (*expert opinion required).REGULATORS AND DCDCs: need filtersAny of thesr devices needs filering the input rails noise to ensure it won't pass trought. I tested LM317 DieNoiser, L7805 reg, DCDC no isolated of any kind, to achieve 5V DC and supply it to arduino trought USB port. While all these methods work when inverter is off, when turn on nothing makes arduino working correctly.Next steps:- SB140 diode in series to arduino Vin (this should cancel lower half wave)- SMD 1206 100uF ceramic cap between arduino Vin and GND (the new 0.1uF ceramic decoupling cap method)- damping resistor allowed is max 20ohm, the same resistance is the limit for any LC filtersCrazy ideas:- earthing the ferrite bead (the VAC earth is not connected to battery GND or any other thing. It goes to a steel braid scratching the asphalt (yes is a camper van))- wrap a coil (and a counter coil) to inverter rails and connect it to earth. My inverter rails goes up to 5000W peak power so I need an expert opinion.Any other suggestion is really apreciated. I would ideally solve the probmem on inverter rails... if not I would operate only on arduino rails. Since now, I never analyzed the inverter noise. But now, since that huge Vpp I think it could damage other 12V devices (diesel heater, water pump, led strips, GPS tags, tuya relays, engine battery charger, etc..)Thanks in advance
Open Source Video Overlay & Display Signal Generation - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: September 03, 2025, 07:56:59 pm
content: what is the best way to add video genlock overlays & signal generation to a CVBS video input.combine an analog video signal with digital signal generation for a CVBS video output.CVBS or analog video signal format is considered obsolete.however it is still used in applications as in CCTV & drone video displays & retro colour organs.in the video by Techmoan the device takes an audio signal from a speaker or microphone & generates a visual outputin the video Techmoan is using a retro colour organ type display. however the digital signal generation is of poor quality .lacking true kaleidoscopic effects. see at 10:00 to 10:13 in the video.what is needed is an open source Arduino or Raspberry Pi type development board for CVBS genlock & video signal generates.that can spilt a digital display signal generation into 4 quarters & add it to an CVBS or analog video signal format.one genlock application is adding a sight reticle / height markings to CCTV or another as a digital overlay for a drone video display.here is an opportunity for improvement on an old idea that is still been used today. the analog video genlock overlay generator.in the YT video by Techmoan at 2:20 & 10:35 the digital display signal generation needs recoding for better results.still another application is circuit bending analog video art were the video synchronization must remain constant butthe remainder of the video signal can be chopped up & warped. any suggestions are welcome.well Techmoan's video is a about the VidPix My hope this type of video console can be improved upon.with a unit that is open source with a video input for genlock video mixing & many audio modulation options available like adding bluetooth modules.including the use of open source software for circuit bending or adding reticle overlays to analog video with Arduino or Raspberry Pi.more about VidPix as a dirty mixerproduce distorted, glitchy & unpredictable video effects without video synchronization of an input video feed.The Sleepy Circuits Hypno this video clarifies what avideo synthesizeris. apology for the flickering -epilepsy warning.Sleepy Circuits Hypno video synthesizerhttps://sleepycircuits.com/hypnothis video shows what a video synthesizer is able to generate with a Raspberry Pi.having someone develop an entirely open source video synthesizer kit with an video input genlock overlay mode would be awesome.like this, but entirely open source if possible for more conventional uses of such as adding a sight reticle or security height markings to CCTVthat all from Me down this psychedelic rabbit hole!
How to waterproof your electronics - Page 1
Forum section: electronics / general

author: TriplePointDesign
author_rank: Newbie
timestamp: March 22, 2023, 07:38:30 pm
content: This blog post is a summary of the many waterproofing methods we've used over the years in our open source logger project including the DIY underwater housings we make from PVC plumbing. Also describes how to oil-mount pressure sensors to protect them from salt water corrosion:https://thecavepearlproject.org/2023/03/17/waterproofing-your-electronics-project/

author: aeberbach
author_rank: Regular Contributor
timestamp: March 22, 2023, 10:35:56 pm
content: Thanks! I am hoping to get a network of soil moisture sensors in this year, it will be very useful to read this.

author: TriplePointDesign
author_rank: Newbie
timestamp: March 24, 2023, 07:20:30 pm
content: We did a big student project last year with soil sensors that I should get around to posting about. Fair word of warning: getting soil data that is 'qualitatively understandable' when you glance a the graph is really quite easy. Getting soil moisture data that is quantitative is really darned hard. Relative to something like light sensors, calibration is more difficult because soil environments are so incredibly diverse.

author: TriplePointDesign
author_rank: Newbie
timestamp: May 26, 2023, 06:52:20 pm
content: After waterproofing, you need some way to test if it really worked right? We needed a way to test our little falcon tube loggers and household water filter housings are a good solution as the domestic water pressure range of 40-80psi overlaps nicely with sport diving depths. The internal clearance of that 4x10 filter housing is only slightly larger than 4.5" x 9.5" but could accommodate a good range of other dive computers, lights, etc for testing.https://thecavepearlproject.org/2023/05/24/a-diy-pressure-chamber-to-test-housings/

author: barshatriplee
author_rank: Regular Contributor
timestamp: June 04, 2023, 10:29:41 am
content: In this article, I can see a picture of a capacitive soil moisture sensor. I can see that it has been waterproofed by hot glue. But from the picture, it seemed to me that hot glue has covered not only the circuit but the electrode also. If the electrode is covered, how will it take reading from the soil? Isn't it supposed to touch the soil? Or there is no glue over the electrode?

author: f4eru
author_rank: Super Contributor
timestamp: June 14, 2023, 09:40:39 pm
content: Capacitance sensors are insulated by principle.

author: MathWizard
author_rank: Super Contributor
timestamp: April 02, 2025, 07:59:41 am
content: Great article, I'll have to try potting something with hot-glue. There's a few outdoor projects I might make someday, like barn door alarms on a farm. I'll have to remember the superglue plus baking soda too, as a waterproof sealer in a jam, and plumber's putty. All easy and cheap to get.
ATMEL PLD device definition file - Page 1
Forum section: electronics / general

author: nipanchal72
author_rank: Newbie
timestamp: March 21, 2025, 03:07:39 pm
content: Hi,I am working with an old ATMEL PLD (ATF2500C-20KM) and trying to compile the original ABEL code using ABEL4.0 compiler. During compilation it flags an error "cannot find p2500c.dev file" (part definition file). This file reside within ABEL4.0 application in sub directory <LIB> ABEL4LIB.DEV or ABELPLD.DEV file. Is there a way to maually generate this file and once created how do I point to this device definition when compiling. Any suggestion would be helpful.
STLINK-V3MINIE adapter to 2.54mm pinheader - OSHW - Page 1
Forum section: electronics / general

author: DerTobi
author_rank: Newbie
timestamp: February 14, 2025, 09:46:31 pm
content: I thought this might be the right place to publish this project and also a good opportunity to introduce myself to the forumI built a small adapter PCB which adds a standard pitch pin header to the inexpensive STLINK-V3MINIE. There is also a current limited LDO supply for the target included. I hope this might be helpful for some of the STM32 fans here.You can find all files and some details how to built it onhttps://www.embedded-ideas.de/posts/250214_stlink-v3minie_adapter/

author: coromonadalix
author_rank: Super Contributor
timestamp: February 15, 2025, 03:28:32 am
content: you where too late loll dang that's what i neededi had to patch my minie almost like yours,I soldered an idc header and bending theses pins to fit the minie spacing and get the 5v or you have a 3.3v reg on it loll and use dupont jumpers ...kudos for your board

author: DerTobi
author_rank: Newbie
timestamp: February 15, 2025, 09:37:01 am
content: Thank you. It's good to know that it would have been usefulI had this in my drawer for quite a while now but didn't had the time to write a blog post. Maybe next time I do a quik'n'dirty pre-release.
Complete FetHead clone - Page 1
Forum section: electronics / general

author: Zipdox
author_rank: Regular Contributor
timestamp: February 15, 2024, 10:30:49 pm
content: Ipreviouslymade a FetHead/Cloudlifeter. Now I've made a complete inline clone of the original. The best part is you can order the assembled PCB from JLCPCB and solder it into the housing, which is an Amphenol AC3F3MW.https://oshwlab.com/zipdox/inline-fethead

author: parawizard
author_rank: Regular Contributor
timestamp: January 31, 2025, 04:31:00 pm
content: That's pretty cool and in that form factor too
Power supply with open source firmware and 60v 30a output? - Page 1
Forum section: electronics / general

author: ME20001
author_rank: Newbie
timestamp: January 14, 2025, 11:39:08 am
content: Hello Folks.I am looking for a PSU that can output about 30 amps and 60 volts, but it is neccesary that it has:USB or RS232 / 485 interface AND OPEN SOURCE FIRMWARE. I mean not open source like theres someone make a custom firmware for it like its on the Riden RD devices, but actually (online) available source code for it.I appreciate any hints and help to this topic.Kind regards Elias

author: GotZapped
author_rank: Contributor
timestamp: January 31, 2025, 08:10:26 am
content: The closest thing would be the EEZ Bench Box 3 (BB3) which has a substantial thread at:https://www.eevblog.com/forum/projects/eez-h25005-a-possible-successor-of-eez-h24005-programmable-power-supply/The developer @prasimix is very helpful and there might be a module/configuration that meets your needs.
Design Group to Learn and Design Single board Computer - Page 1
Forum section: electronics / general

author: Arsh ahmad
author_rank: Regular Contributor
timestamp: October 19, 2024, 06:19:23 pm
content: Hi,I want to learn thoroughly the process of Design a Single board computer from scratch, I thought it would be better If I can join/create some group to work on an SBC from scratch. I have a good hardware back-ground, but I want to learn designing much more complex hardware with very fast and advanced interfaces. And this can be a very useful open source project as well.

author: Zipdox
author_rank: Regular Contributor
timestamp: November 05, 2024, 02:10:53 am
content: What experience do you have? Do you have a company? Many SoCs require access to NDA restricted documentation to be able to design boards for them, and you're not getting that as a mere mortal.

author: lu1s.p
author_rank: Contributor
timestamp: January 29, 2025, 08:52:43 am
content: Are you interested in anything in particular?
hydra meter - Page 1
Forum section: electronics / general

author: mikola1989
author_rank: Newbie
timestamp: December 23, 2024, 01:28:29 pm
content: Hi all,Long time lurker here. I just came across this project on YouTube and thought it would be up your alley!This meter features a detachable display, logging, and USBC. all the details I know of are in the video.It looks like a pretty cool project.Poject Github:https://github.com/jduffy105/HydraMeter_0.4HackadayIO:https://hackaday.io/project/176607-hydrameterIf this does not belong here, please remove.

author: EEVblog
author_rank: Unknown
timestamp: December 26, 2024, 09:48:48 pm
content: New thread:https://www.eevblog.com/forum/projects/hydra-meter-open-source-electronics-multimeter/
Open Hardware Power Rail (DC offset) Oscilloscope Probe - Page 1
Forum section: electronics / general

author: blinken
author_rank: Newbie
timestamp: January 07, 2024, 05:25:04 pm
content: For the last 4-5 months I've been working on an open hardware power rail probe:https://github.com/blinken/power-rail-probe.It's a device that sits between your 1X probe and your oscilloscope and applies a fixed DC offset, allowing you to view millivolt ripple and sag on rails up as high as +/- 20V, with a fairly flat frequency response to 500MHz. Introduced noise is simulated at <400nV/sqrt(Hz) below 100kHz, and tailing off at higher frequencies.It's a little more complex than a simple AC blocking capacitor, because the offset isfixed- so slow DC drift is also measurable, in addition to ripple.I've just finished version 1.0 - while there are some obvious areas for improvement to make itperfect, it works very well for day-to-day use, and so I'm releasing it in the spirit of "perfect is the enemy of good"A commercial version of this probe costs around USD $5000 (eg,https://www.tek.com/en/datasheet/active-power-rail-probes). This open design costs ~£250 (USD $320), fully assembled in a nice case. I have a handful remaining of the first version, and any early support would be very welcome!My goal is to fully characterise the device and release well-calibrated data around noise and frequency response on the GitHub page, so it can be used for precise measurements. If anyone in the UK has the ability, time and patience to make calibrated noise measurements (down to say -100dBm) I'd love to get in touch.I'd appreciate any feedback on the design!-Patrick

author: apetersw
author_rank: Newbie
timestamp: March 20, 2024, 12:24:04 pm
content: Hi Patrick, the design looks like an interesting project. I took a look at the schematics and I wonder why u do not go all the way to 60V range, so one can use the probe on 48V rails. U did use the OPA322, two stages x1. First try I would go sonething fancy like OPA891. This might allow directly feeding into 50Ohm, even lowering the noise.

author: Smokey
author_rank: Super Contributor
timestamp: September 11, 2024, 10:49:33 pm
content: I just saw this on IMSAI Guy:

author: DutchGert
author_rank: Frequent Contributor
timestamp: December 01, 2024, 06:39:15 pm
content: To bad this does not get more traction because it is actually a very nice (but niche) product.

author: nctnico
author_rank: Super Contributor
timestamp: December 03, 2024, 07:40:07 pm
content: One of the problem I see with the schematic is that the DC gain depends on where the offset potmeter is at. The schematic this project is based on has some flaws.It looks a lot like the product from this thread:https://www.eevblog.com/forum/testgear/prp1-low-cost-2ghz-power-rail-probe/
SesCom  SIP modules - Page 1
Forum section: electronics / general

author: Richard Crowley
author_rank: Super Contributor
timestamp: November 06, 2024, 05:50:01 pm
content: Does anyone have any info about the "SIP" modules from SesCom?There were around 20 different postage-stamp-size modules: SIP-1, SIP-2, etc.....They were (mostly/all) audio-related.SesCom is no longer in the business of selling these modules and other "maker"-type products.I would like to revive these modules and make them available open-source on the popular PCB vendors.

author: jduncan
author_rank: Regular Contributor
timestamp: November 10, 2024, 03:16:15 pm
content: If you can even find information on them anywhere on the internet, what makes you think there'd be any use/market/interest in these?
Open source PCIe Carrier Card for Avnet Ultrazed Zynq Ultrascale+ SOM  - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: September 27, 2024, 06:42:34 pm
content: I have Designed a Open source PCIe Carrier PCB for Avnet Ultrazed Zynq Ultrascale+ SOMSource available onhttps://www.circuitvalley.com/2024/09/open-source-avnet-ultrazed-pcie-carrier-xilinx-zynq-ultrascale-plus-amd.htmlFeedback would be Highly Appreciated.
Using Weller Micro Soldering Tips in Miniware Irons - Page 1
Forum section: electronics / general

author: JosiahCochran
author_rank: Newbie
timestamp: April 13, 2024, 05:34:44 am
content: I have a TS1C soldering iron, but I have an application where I need a much finer tip than available by miniware. I found out weller has some micro soldering tips that use a 3.5mm jack like the tips for the miniware irons (but the stations they go to are ~$1000), so I ordered the Weller RTP 001 C. I found the diameter is a bit too wide after the 3.5mm jack so I got an extension that puts the jack just outside the iron so I can attachd the Weller tip. It detects the tip and warms to about 160C before it gives a no tip error that does not go away until the tip cools back down. I guess the temeprature coefficient for the tip is different than that of the miniware iron so probably resistance goes too high and the iron detects no tip. Im wordeiring if anyone with experience with firmware dev on the miniwar irons could tell me how to program a different tip calibration so that I can use the weller tip.

author: stj
author_rank: Super Contributor
timestamp: July 17, 2024, 12:19:38 pm
content: are you sure weller still uses resistance?most companies now are using thermocouple junctions to generate a voltage.it's a lot cheaper to make a tip that just welds 2 different metals together than to include a resistive device

author: Md tarique anwar
author_rank: Newbie
timestamp: August 13, 2024, 10:05:30 am
content: In days companies are using thermocouple junctions to generate a voltage.it's a lot economical to make a tip that just welds 2 different metals together than to include a resistive gadget
USB7216(C)  USB 3.2 Gen 2 Hub - Page 1
Forum section: electronics / general

author: terrance
author_rank: Contributor
timestamp: July 25, 2024, 12:13:51 am
content: Actually designed and tested prototype 1y ago. With some bugs, but almost all ports tested, (only the last USB2 port has inverted polarity, fixed now).main features:- USB7216C, spitted USB 1.1/2 and 3.x signal, so low/full/high speed devices don't occupy a super-speed port- 1 Type-C UFP(not flipable), USB 2 and 3.x- 1 Type-C DFP(flipable), USB 2 and 3.x- 3 Type-A DFP, USB 3.x only- 5 Type-A DFP, USB 2/1.1 only- 20-30A 5.4-5.5V supply, plenty of juiceedit:- Reserved header for USB audio I2S codecKnown remaining issues:- Unable to obtain USB7216 firmware, or write config to EEPROM, thus have to use the config tool (supports Linux and windoze) to download config.edit:Config must be combined with firmware and stored in SPI NOR Flash. if the firmware is impossible to get, maybe I should add a small MCU to config it via I2C.

author: terrance
author_rank: Contributor
timestamp: July 25, 2024, 12:15:07 am
content: all known bugs fixed, clearing DRC errors/warnings now.
Just Fully Open-Sourced This Mini-KVM. Care to Peek? - Page 1
Forum section: electronics / general

author: youyoubilly
author_rank: Newbie
timestamp: July 04, 2024, 11:47:32 am
content: I just got my Mini-KVM fully open-sourced and just got the official nod from OSHWA!https://certification.oshwa.org/cn000015.html

author: zapta
author_rank: Super Contributor
timestamp: August 17, 2024, 03:59:50 pm
content: Where is the source code?

author: Nominal Animal
author_rank: Super Contributor
timestamp: August 20, 2024, 12:44:07 am
content: Quote from: zapta on August 17, 2024, 03:59:50 pmAfter you click FAQs or Contribute, click on the bottom link on the left,Contributing.On that page, after the "Navigate to:" heading, you can find links to the three Github repos:Schematics and components,Host applications for Win & Linux support, andHost applications for MacOS support.Or seegithub.com/TechxArtisanStudio.
Sparkfun founder and CEO on running an OSHW business - Page 1
Forum section: electronics / general

author: MoHaG
author_rank: Newbie
timestamp: May 22, 2024, 08:40:14 am
content: I found this quite interesting. Things like how to deal with clones, etc are quite interesting.(Quite a long talk, it seems like it was at some university event (It is Joshua Pearce, an academic's, channel)
PHNX — Custom Ergo Mechanical Keyboard - Page 1
Forum section: electronics / general

author: sini6a
author_rank: Contributor
timestamp: May 02, 2024, 04:17:09 pm
content: Hi everyone!For the last couple of months, I have been working on building my custom ergonomic mechanical keyboard, which features 54 keys, each equipped with an addressable LED.The microcontroller I have used is the ATMega32U4, and it uses the QMK firmware for key mappings.I also filmed the whole build process, including schematic overview, board layout, and assembly. Please take a moment to watch the video, and any feedback is warmly welcomed.https://youtu.be/Z5Uw6cO_Igg?si=-UtlOLHXQ6wf7H21The source code of the keyboard can be found on the link below:https://github.com/sini6a/phnxBest Regards
RED PITAYA BOM - Page 1
Forum section: electronics / general

author: acontu34
author_rank: Newbie
timestamp: April 03, 2024, 09:28:02 am
content: I kwon that REDPITAYA is close-hardware, but, Did you know where can I find the bill of material about RED PITAYA STEMlab 125-14 v1.0?I need it to perform a reliability analysis for research scope.

author: Halcyon
author_rank: Unknown
timestamp: April 03, 2024, 09:36:26 am
content: Duplicate thread ofhttps://www.eevblog.com/forum/projects/red-pitaya-bom/
Let's share some knowledge. - Page 1
Forum section: electronics / general

author: MBrahim
author_rank: Contributor
timestamp: May 04, 2024, 08:31:14 pm
content: Hello, I've been into hardware for about 2 years now and I've never been that close and involved with it before.I'll be gone for a duty for about a year, I need some books to take it with me to increase my knowledge and never let electronics leave my brain.right now I'm not that professional so if you want to recommend a beginner book it's okay.I'm more into Power electronics right now but signaling will be cool too!I will go buy a version of the ART of the electronics as a start. What else do you recommend?
Design of two drivers for a DV-S9 type diving flashlight OSHW - Page 1
Forum section: electronics / general

author: luicer
author_rank: Newbie
timestamp: April 01, 2024, 10:23:52 am
content: Hello everyone,I want to share with you the design of two drivers for a DV-S9 type diving flashlight. The complete design documentation can be found on my blog:https://luicer.github.io/categories/#led-flashlightThe first driver is of the linear type and supports a current of up to 3A with an efficiency of up to 70% at maximum supply voltage (4.2V), the second driver is switching type and supports up to 1A with an efficiency independent of the supply voltage of 85%.The PCB has been designed for the aluminum housing of the flashlight and is easily interchangeable.The measured efficiency for the linear driver as a function of the supply voltage is as follows:The measured efficiency for the switching driver is as follows:If you have any comments, let's discuss them.
Finding replacement part for a Zener diode  - Page 1
Forum section: electronics / general

author: Svenski-79
author_rank: Newbie
timestamp: January 28, 2024, 05:23:45 pm
content: In the OpenBCI Cyton board , the BOM contains a 3V zener diode (CZRQR52C3-HF), unfortunately the product has reached its end of life as per Mouser Electronics. can someone please point out a replacement I can use, it would be much appreciated , there is a lot of challenging stuff for me as a newbie regarding the programming side so any tips regarding the OpenBCI board would also be much appreciated.Thank you

author: Clear as mud
author_rank: Regular Contributor
timestamp: January 29, 2024, 02:25:44 am
content: I'm not familiar with this application, but for most applications, you could substitute any zener diode with the same physical size and voltage rating. I see yours is a 0402 size, though, and I don't find any 3 volt 0402 zener diodes on Mouser. However, Digikey still has over 400 in stock of your part number.

author: cosmicray
author_rank: Frequent Contributor
timestamp: March 21, 2024, 10:18:10 pm
content: Obtaining a zener in a conventional 0402, 0603, footprint appears to be a hard item to locate. A more common diode footprint, like SOD-323 seems to greatly improve your choices. One possibility is LM3Z3V3T1G, which is observed at LCSC at a very low price point.
The Art of Electronics: The X Chapters book needed - Page 1
Forum section: electronics / general

author: sadiq114
author_rank: Newbie
timestamp: March 14, 2024, 08:58:11 am
content: I need the book mentioned in the subject above. Can any body email me?Regards,

author: tggzzz
author_rank: Super Contributor
timestamp: March 14, 2024, 10:05:31 am
content: Quote from: sadiq114 on March 14, 2024, 08:58:11 amSeehttps://x.artofelectronics.net/Well worth the money; an excellent addition/complement to TAoE