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#electronics

31 posts29 participants1 post today
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Ret

Any electronics bods any thoughts on what connector this might be the footprint for? Other connectors on the board use Lumberg MICS but that doesn't appear to fit here (they also don't make a 7-way version of that). This bit of kit is early-mid 90s if that helps. #electronics

A PCB with a ruler for scale. A connector footprint in the middle has alternating pins and two mechanical holes for support.
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DJ🌞:donor:

Hey hey, you thought there be no #nakeddiefriday today? Here we go!

Today's entry is an Infineon/Siemens SAB-C167CR-LM, a microcontroller based on the C166 core. The die is in pleasant-looking pastel colours. :-) The die has pin 1 in top left corner. I'll do a short thread.

Many thanks to @debauer for supplying the samples!

SiPron page with more info and full-res map: siliconpr0n.org/archive/doku.p

An overview shot of the die in question
#electronics#silicon#reverseengineering
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Natasha Nox 🇺🇦🇵🇸

Aren't there extension cables for these solar panel connectors? I only find "MC4" cables, which seem to be only the connector on the receiving end but not the panell side. I need an extension for the panel side though. as 2 of the 4 panels are further away.

Do those extension cables even exist, or isn't this meant to be due to some frequency issues? Should I instead get another one of those cables with 4 connectors put them in a row if possible? (Seems to be possible?)
#solar #electronics

Photo of a solar panel connector.
MC4 Connector, both sides of the cable exist on the same cable.
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Philip Bragg

Today I set up my three HP 5335A counters so I could measure the OCXO warmup curves of both the units that have OCXOs using the third, which has an external GPSDO reference. I wrote a PHP script to measure Frequency A and Frequency B alternately every 4 seconds, with A and B inputs connected to the Reference Out sockets of the other two. Here's how it looks on a garish Apple Numbers chart. Both oscillators seem to have a very similar warmup curve - though the frequency offset is slightly different (it's quite hard to calibrate them exactly) #radio #rf #electronics #HP

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Delta Sierra

Anyone need some split core current transformers?

Up until about five years ago, I worked for an energy metering company. They did a warehouse cleanup and got rid of tons of material, including hundreds of CTs for AC current measurement. I snagged all of those (and used some for my own home metering) but I still have probably 200 floating around.

I've got split cores rated for 50A up to 6000A or so, and physical sizes from about 1/2" ID to 8" ID (the larger ones are flexible rope style). Mostly rated for 0-333mV AC output but there may be some oddballs in there (like 0-500mV, maybe a couple 4-20mA).

I need to clear up some space, so I was thinking $20 plus shipping per CT, maybe with a bulk discount if you get five or more? Some of these retail for $100+ so if I have something you need it could be a good deal! Most of these are lightly used in a testing environment.

A large dining room table loaded with current transformers in a wide range of sizes and current ratings. With the long wire leads attached to each current transformer, it looks almost like some sort of mechanical spaghetti spilled all over the table.
#fedisale#electronics#monitoring
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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
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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.
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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
Replied in thread
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Joshua Purba :comfypeeksneaky:

LOL nope.

I see that there are a lot of projects that connected the Si4703 3.3V pins directly to Arduino 5V pins and claimed to work.

Not a few, a lot. Weird isn't it? They cannot all be fake.

So I dug deeper. As I was reading more about Si4703, a post by jezo421 in GitHub comment dated 2025-01-04 jumped out to me:

Yesterday I received the Si4703 module from Ali. I had the same problem. I2C communication was OK, but tune did not work. Register Status RSSI was still 0x0000. The problem was HW. Pad 16 on the bottom of the chip was not soldered. It is an analog power supply, so it could not work. The repair was unpleasant, but it was successful :-)

https://github.com/pu2clr/SI470X/issues/4#issuecomment-2570595858

Could it be? That my Si4703 breakout board is from the same batch as jezo412? That my problem was actually caused by bad solder job?

Nothing to lose except time and effort, I tried desoldering the Si4703 chip, and guess what?

Pin 16 (VA = Analog Supply) was dry, no solder. :blobcatangry:

I resoldered it to the breakout. Tried breadboarding with similar setup as before. And it works. IT WORKS. Despite me previously exceeding the absolute max voltage for SCLK, SDIO, RST, and GPIO2 pins.

Solved! Problem = pin 16 not soldered. Solution = desolder the chip and resolder.

Thank you jezo421 :blobhaj_thanks_wow:

So if your Si4703 breakout appears to be not working, or even if you mistakenly connected the pins to 5V, don't give up yet! Your breakout may have the same problem as mine and jezo412, so try to resolder the Si4703 chip!

The Si4703 breakout board covered by aluminium tape with hole on the Si4703 footprint. The Si4703 chip itself had been desoldered and lying bottom-side-up (pads visible) on the right of the breakout board.
Close up of the underside of the Si4703 chip. It is obvious that pin 16 (uppermost right) was not soldered. Pin 6 (leftmost bottom) while not ideal at least had some solder.
The breakout board after resoldering the Si4703 chip. I am not good at it, so the audio jack is partially melted. This was before I cleaned the plentiful and sticky flux residue. Lots of alcohol and it still feel sticky.
Me holding the breakout board with Arduino Nano clone, a logic level converter, the Si4703 breakout board, and external power supply, everything is powered on. Behind the breadboard is the computer monitor, showing Arduino IDE with serial monitor printing logs that shows that everything works now.
#Electronics#Arduino#Si4703
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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.
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