Recent content by costa

  1. costa

    0-30 Vdc Stabilized Power Supply

    if anything can go wrong it will go wrong...murphy's law... >:( >:( >:( my project worked fine all the time... :D :D :D it was not faulty in any way...current regulator works fine....it delivers over 4Amps on 30Volts... my mistake was that i used chinese,piece of shit,analog ampermeter...
  2. costa

    0-30 Vdc Stabilized Power Supply

    hi audioguru... my projects transformer is 150VA...my C1 is 10000mikroF 50V mounted on pcb... my rectifier is MB356 35A 600V fast recovery... i checked every connection on pcb...all is ok...i could not mistaken the conection of elements anywhere beacause i use the orginal pcb design,did not...
  3. costa

    0-30 Vdc Stabilized Power Supply

    my suplly still lacks power... i connected two light bulbs in parallel to see if it goes to 3 amps... it doesnt...since one draws 1.5Amps on 32V two sould draw 3 amps... current limiter of the suplly limits this load to 2.2A on 18Volts...with both pots to max... please help... 
  4. costa

    0-30 Vdc Stabilized Power Supply

    tnx audioguru... found the problem...i misconnected the pins of Q2... now i can get full power on the output... i messured the voltages that u asked... my load draws 1.5A on max.output voltage of 34V...current limiter lights the led when utput is shorted but it doesnt turn the output off (my...
  5. costa

    0-30 Vdc Stabilized Power Supply

    current limiter doesnt work when output is shorted >:( >:( >:( voltage on pin6 of U2 drops from 42V (without load) to 25V (with load) >:( >:( >:( please help :'( :'( :'(
  6. costa

    0-30 Vdc Stabilized Power Supply

    the current limiter works fine...led lights when pot goes to minimum (with the load)... i didnt try shorting the output...will do...will messure the v on pin 6 of U2.... thanks....
  7. costa

    0-30 Vdc Stabilized Power Supply

    hi... i must say that in first tests on this supply (with orginal parts list) it worked fine...the load (24V 50W light bulb) went over 30V and 2.4A...of course it had heat problems... then i changed the  project with updated part list because i need sure 3A with 30V output...managed to obtain...
  8. costa

    0-30 Vdc Stabilized Power Supply

    hi... a question... has anyone found another complementary OP's for this project... OPA445 is very expensive and MC34071 and TLE2141 cant be found in croatia... please help...(mixos , audioguru , anyone)
  9. costa

    0-30 Vdc Stabilized Power Supply

    thanks audioguru... sorry i didnt mention that i use stronger transformer as specified... ;D but i ask again for the cap C7 (not C1) if it could or should be of a bit larger capacity??? thanks... btw. audioguru, i am searchin for a timer circuit that would turn off my aquarium lamp in the...
  10. costa

    0-30 Vdc Stabilized Power Supply

    hello guys!!! :D :D :D this is my first post here, since i registred few days ago... i built this power supply with org.specs and it works fine...2.5 A with almost 34V.... i am going to modify it so it can hold more than 3A output current as suggested by you all... I read all the posts about...
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