DIY

Test of 5 AC-DC PSUs cheaper than $1.5

I need  220AC to 5V PSU for exhaust fan controller, the trickiest part – it should be as small as possible. The main load is LEDs, same time supplied voltage should be clean enough for analog to digital conversions doing by attiny85. So I bought and test 6 different PSU. Because of seller mistake one […]

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Repairing of kitchenaid phase control board

It’s a story how I spent thee days troubleshooting 9 elements circuit when 7 of them are passive. I didn’t found what’s wrong, but fixed it. Foreword: I have  control board marked as W10354309, it’s European 220V model of phase regulator. I don’t really understand the rules how kitchenaid marks their parts, because I found […]

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Simple temperature controlled fan regulator

Some time ago I pulled out temperature fan controller from one of old ATX PSU. With 12.2V input it provides 4.5V at 25°C and raises output voltage till 11.8V at ~70°C. After changing Q2 to higher voltage transistor and tuning of R4-R5 this divider this controller should be suitable for 12V fans with 24/36/48V input. […]

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One and a half port charger on TP5100 module

WARNING: Lithium batteries can be extremely dangerous when handled unproperly and lead to fire hazard. Information provided as is, you can use it on your own risk. Before last holidays I bought cheap Chinese action camera, which came without separate charging station. Camera’s battery could be charged only in camera, charging batteries via which have […]

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