DIY Tr Tester Duoyi DY294 repaired
This page shows how I could fix broken DY294 by reverse polarity power supply. It works for over-voltage damage, too.
DIY
DIY 
DIY DIY Tr/FET Tester completed
According to the cirduit design finished in below link, I have just finished assembly of Transistor/FET tester (hFE measurement device). It can fix the Emitter current (Source curr…（Read more）
DIY DIY Tr/FET Tester, ultimate hFE/Vgs/IDSS measurement device
I built ultimate hFE tester. I gathered many good ideas from internet and made up the best version I could imagine. It enables measurement of hFE under constant emitter current. This achieves also Vgs and IDSS of FET measurement.
DIY DIY Center speaker
Just completed Home surround system. I have been using ELAC FS207A as main speakers, and wanted to have matched center speaker, so bought ELAC CC203 used in last year September. Ho…（Read more）
DIY Bosch Washing machine Logixx 8 Door unlock repair
There are several ways to unlock a faulty Bosch washing machine door that will not open. Finally I found this method worked for my case, opening the door by inserting a dish knife into the gap in the handle. Reinforce the broken hook to regain its shape.
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