Search results

  1. J

    0-30V Stabilized Power Supply

    alright it happened again i fried my driver chip right away now this is after i ran the supply with just a led as a load. i hooked up my ampmeter and and showed from voltages 0 to 30v, 0 to 93 millamps my current limiter was funtioning correctlly cause i was able to set my current at 20 millamps...
  2. J

    0-30V Stabilized Power Supply

    right again it was the bd139 now i get my variable back and i checked my amps with just a led and i can control my amps thanks guys for all your help will try to get pics when done
  3. J

    0-30V Stabilized Power Supply

    i turned the driver transisters around and the powersupply worked great right up until i hooked up my 18v dewalt drill test motor i may have over amped the circuit i dont know i didnt have ampmeter tied in but now i get 34 volts through the output nothing less on picmasters verion theres a...
  4. J

    0-30V Stabilized Power Supply

    audioguru you are unbelievable you know i had the bd139 on the board and changed them out with a tip3055 cause i could only get the bd139 into126 package thinking the plastic case would needa larger heatsink i have tip3055s as output transisters but these are much larger than the tip3055 i got...
  5. J

    0-30V Stabilized Power Supply

    yes of course my picmaster version U1 is your march 11 rev2 U2. the one emmiting to the driver base emitter which im using tip3055 to-220 also i using the mc34071 chips which none of them are really even getting warm. im using 2 56k resisters at the output terminal to add a 112k load. question...
  6. J

    0-30V Stabilized Power Supply

    hey guys ive posted here a couple times this time  i think i got it right.  need help on my progect ive built the newest version of the supply and for the most part it works. my problem is the output of u1 ( this is the picmaster version so follow his print) ive got 34v at the rails but my...
  7. J

    0-30 Vdc Stabilized Power Supply

    can anyone help me i ve built a dual power supply. i did picmasters version and im having trouble ive got my 11.2 volts out of u1 so i know my reference voltage is right. my current limiter was working before  but i found a bad trace to ground and my voltage out of u2 was always 17 volts now...
  8. J

    0-30V Stabilized Power Supply

    hey guys i built a duel supply the lastest vesion of the picmaster anyhow i had some bad traces and got that straight . i have 34 volts at main power rail to ground but i only get 17 volts max at my output  ive  got 11 volt out of u1 so thats working also before fixing the bad traces my led was...
Top