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#electronics

43 posts35 participants7 posts today
Public
jaseg

Just in case like me you didn't know: You can get single SMD contacts like the one in the picture below on digikey under the "RFI and EMI - Contacts, Fingerstock and Gaskets" category, and on LCSC under the "Industrial control electrical / Antenna spring" category. I've looked for these more than once and haven't found them. Links:

digikey.de/en/products/filter/
lcsc.com/products/Antenna-spri

A product photo of a small SMD board-to-board spring style contact that can be soldered to a board, and contact a bare pad on another, parallel board above. The contact has a boxy shape, has a defined stamped contact point, a small leaf spring to provide pressure, and a folded box that serves as an end stop and protects the leaf spring from damage by overcompression. The contact is gold plated.
#electronics
Public
Jer 🚵🏼

Checking smoke detectors today and replaced the remaining two that took batteries with new 10yr models. Cracked open the old smoke detector (as one does) to check out components it's interesting to see that instead of using actual switches for test/mute buttons, it's just spring steel poised over a wire on the circuit board. Also this has both an optical particle sensor and an ionization (americium-241) detector. The other detector was only ionization.
#electronics #design #FireSafety

view inside old smoke detector, in the foreground is a piezo (speaker), a metal case holding the particle detector and an ionization detector. In the back middle is a red LED and on each side of that flat metal parts hovering in the air over a wire in the printed circuit board, these are momentary contact switches
the photo detector which is a black “chamber” (lid removed) where an LED (IR? UV?) LED shines and there’s a detector that would pick up any stray light that bounces off of smoke particles.
Public
China Business Forum

[#TRADESHOW] The 2025 #Appliance & #Electronics #World #Expo (#AWE) will take place from March 20–23, 2025, at the #Shanghai New #International #Expo #Center (#SNIEC) in Shanghai, #China. As #Asia’s premier #platform for #home appliances and #consumer electronics, AWE is where #global #brands #showcase cutting-edge #products and services, offering visitors an immersive experience of #innovation and #technology. cnbusinessforum.com/event/2025

China Business Forum2025 Appliance & Electronics World Expo (AWE) – Leading Asia’s TecExplore the latest in home appliances and electronics at AWE 2025, March 20–23, Shanghai. Join 365,000 visitors, 1,100 exhibitors, and discover top industry innovations.
Public
Laurabunny

(Tagging electronics folks, feel free to respond or not as willing/able.)

I'm doing initial research to design a custom battery mgmt/charge/balance circuit for a prototype. 4S/5S LiPo (nonprotected), 90Wh, 12A discharge. It needs to run the device while charging, like a laptop.

Any advice or resources on circuits/architecture/ICs, key safety req's? I'm a professional circuit designer but not experienced w/Li batteries.

Thanks!

@cmb @gsuberland @chris_gammell

#circuitDesign#electronics
Public
Athamanatha

So today is not going entirely to plan.
The set of additional #solarpanels I connected up refuse to give us juice. I tried to trace the fault and got jack shit info because my cheap ass 19 year old #multimeter is (confirmed by many tests now) not working any more. Its fuse is fine too, as is its #battery. It just displays zeros.
So add to the list of unexpected expenses and delays one new multimeter...

#mutualaid is our lifeline to #selfsufficiency so we can help others. Can you help us out with our expenses for...?

Multimeter: $7-8 at Harbor Freight
Crimp connectors: $?
Tyres: ~$1200 (Vulpibus)
Refilling fuel: ~$100
Refilling my overdraft: ~$500
Refilling my other overdraft: ~$250

#moneyhelp#trans#escapingfascism
Public *
Jer 🚵🏼

For those following the solar hot water project it got assembled this morning, flushed with water, checked for leaks, emptied, and then pumped full of a glycol/water mix. The motor purrs like a kitten as it circulates the liquid through rooftop collector and heat exchanger at bottom of 120gal storage tank.
The solar controller is checking bottom of the tank and comparing it to collector. When I plugged it in:
top of tank: 120° (heated by electric earlier)
solar collector: 102°
bottom of tank: 57°
In last twenty minutes the bottom of tank has risen to 70° and collector is up to 115°.
#SolarHotWater #electronics #homerepair

First test of pump install, looking for any leaks. Wiring isn’t buttoned up yet since I might need to pull things apart again. Solar controller is showing the collector temperature of 102°F
fresh glycol in electric pink, mixed 50/50 with water. There’s a pump that pumps from this container into solar “up” side of a check valve, forcing water up the pipes and to collector. The other hose comes from the heat exchanger, in this way it’s a closed loop pump to fill things and remove any bubbles in the pipes.
after it has been filling the system for a while, bubbles still coming out, over half of the liquid is now in the pipes/collector. At some point I close the return valve and let the pump keep going until the pressure gauge goes up near 20, then everything is shut down, it will run for part of the day and then I’ll pump the system again to extract any remaining air bubbles.
Home assistant chart of the temperature of return pipe from solar collector just before it goes into tank’s heat exchanger. This is a little ESP32 ESPHome board with a simple temperature sensor.
Public
Fedi.Video

Jan Beta makes videos about repairing and restoring old computers and other equipment, especially the Commodore Amiga and C64:

➡️ @jan_beta

There are already over 40 videos uploaded. If they haven't federated to your server yet, you can browse them all at makertube.net/a/jan_beta/video

You can also follow Jan's general social media account at @janbeta

MakerTubeJan BetaHi I'm Jan. I tinker with electronics and enjoy vintage tech, mostly computers and consoles from the 80s and 90s. I also love to tinker with elderly hifi equipment and musical instruments from time...
#FeaturedPeerTube#Commodore#Amiga
Replied in thread
Public
blinry

Glued and soldered everything together. Now it feels like a real device! I'm super happy! Thanks again to everyone who has helped me to get this far! <3

The CO2 Canary is open hardware, you can find all source files here:

github.com/blinry/co2-canary

I'm planning to write detailed instructions on how to order the required parts, so that you can get one yourself!

A yellow device with a square e-ink display shows the CO2 concentration.
The back of the device: An ESP32, a black sensor, and a lipo battery.
#electronics
Replied in thread
Public
blinry

Yep, my mistake: I didn't number the pins of the chip correctly! SDA and SCL are pins 8 + 7, not 5 and 6! Not sure how I got that wrong, but it teaches me to double-check next time!

Luckily, the fuel gauge is the one component that's a bit optional – just nice to have!

Resoldering it on the board seems difficult, as it's so tiny! How would you approach that? I mean, I could try to cut the wrong traces, and solder teeny tiny wires to the chip? #electronics

Footprint of the chip from the datasheet, with correct pins.
My PCB design, with the wrong pins.
Photo of the chip on the board.
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