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That LM339 PWM circuit is IMHO rather useless. The backlight level can be set to maximum always.
START pushbutton in series with the base of the transistor will leave the base floating?Ian.
START pushbutton in series with the base of the transistor will leave the base floating?
Quote from: IanJ on April 24, 2014, 06:09:46 amSTART pushbutton in series with the base of the transistor will leave the base floating?Add a 100kOhms resistor to ground if you're worried.
sou, i get big truble. i relase, i need build a new transistor tester. can samone help about schematic and hardware?i will build this. https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/if samone hhave schematics, please sent me. beter in eagle files.
Quote from: Aigars on April 30, 2014, 09:30:14 pmsou, i get big truble. i relase, i need build a new transistor tester. can samone help about schematic and hardware?i will build this. https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/if samone hhave schematics, please sent me. beter in eagle files.What's wrong with the PCB you got? I have two of those (exactly the same) and they run fine.
may complitly dont work. i take a part and new i need new schematic and all stufs. i can make a new tester. can u send all files what need? and if u have in eagl files
Quote from: Aigars on May 01, 2014, 10:40:36 ammay complitly dont work. i take a part and new i need new schematic and all stufs. i can make a new tester. can u send all files what need? and if u have in eagl filesPlease download them at http://www.mikrocontroller.net/svnbrowser/transistortester/Hardware/Markus/ (click "Download GNU tarball").