i bought a second hand semi-ded UPS for dirt cheap, replaced battery and MCU filter caps, and it was great
worked like that for 5 years or so
then it was away from me for half a year in unknown condition and then transported to me
it came with dead battery
bought a new battery, plugged it in, seemed good
incidentally unplugged the battery when it was plugged in a working (but not loaded) UPS, and something exploded inside with a nice bang and flash
have no clue why
disassembly shown a fried MOSFET
not sure if it makes any sense to try to fix it
but sadly .me is not Moscow, so can't buy loads of used UPSes for dirt cheap
the fried one is at the right: https://tinystash.undef.im/il/4Z7EYDuSqDh47tQcw4qGjUuJv9VNfVCr24nGmvB8zZ7kdZo1ZnNtfPxyAps7zXFeg5JJvp5rj8W6zNSBAwc2Epvz.jpg
no idea what it feeds, so no clue why opening it would cause a short
also some sus deposit, couldn't identify the culprit: https://tinystash.undef.im/il/2QpKK6BDiUkgcMewPmmXPCyrqKTSJPRX5JCU8JAGnECakmaiHqNgDTtoBdP7huAKvJCRL4934NokVsvwES6QBezF.jpg
i wonder if it makes sense to dig any further or if i should write it off and buy a brand new one
УНЯНЯ. У нас есть немножечко инфы
об этом пользователе. Мы знаем, что он понаписал,
порекомендовал и даже и то и другое сразу.
А ещё у нас есть RSS.
What's the highest performing processor/SoC an open source hardware+software computer could be made on?
I'm fine with the chip itself not being open hardware or running nonfree microcode, but apparently an average Joe can't even have the documentation enough to make a motherboard for x86 or a good ARM SoC.
I know you like ecology and DIY electronics!
http://vperde.l29ah.blasux.ru/dump/0d256f3537e447e49e786365ae90e400/amp1.jpeg
Here is my green efficient class D audio amplifier, 2*4.5W @ 0.2% THD.
http://vperde.l29ah.blasux.ru/dump/a793088301457bf7ac4186f6b13c4481/amp2.jpeg
The amplifier is based on TPA1517NE chip. Some of other electronic components are recycled, as are wires (ATX PSU cables, headphones cable), the casing (it used to be a box full of seaweed), the circuit board (some random pieces of cardboard) and the heatsink (a brass stopcock from an old soviet gas stove that i soldered with a gas burner). There used to be a 3.5mm jack input in the original design, but it didn't survive soldering apparently, so its only job is to attach the circuit board to the case.
Bonus photo:
http://vperde.l29ah.blasux.ru/dump/4e0197b4af2a153ecb495ca9fd815d1d/amp3.jpeg
http://vperde.l29ah.blasux.ru/dump/f62dabf043399407112111de5a3d30fc/neko-koneko.jpeg
USB st-link and UART via a blue pill devboard are powered by https://github.com/blacksphere/blackmagic
Управляем SSD1306 OLED-дисплеем по I2C с помощью FTDI: https://github.com/l29ah/ssd1306-libmpsse
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