paul .a larner Posted November 21, 2020 Report Share Posted November 21, 2020 ive built this psu as per the schematic,the issues i have are,the output is 30v with the voltage pot fully ccw,if i turn the current piot almost fully ccw the output drops to 0 with the led on,if i turn the current slightly cw it oscillates from 0v to 30v about every 3 seconds,the led flashes in time with this also,im using mc34071 opamps ,the only thing i havent changed is d7,its stil the 5.1v zenner,q2 is a bd137 and im using 4x 2n3055 pass transistors with 0.1r emitter resistors,any ideas on whats causing this wierd behaviour?,cheers m3vuv. Quote Link to comment Share on other sites More sharing options...
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