Search results

  1. A

    0-30 Vdc Stabilized Power Supply

    well i looked everything you told me and it still not working....The parts you told me to look are ok!!!!i also replaced the 2N with the tip31 I didn't understand how to find the short with my ohm-meter....Could you please post a schematic with the way to do it(sorry)and also when i changed...
  2. A

    0-30 Vdc Stabilized Power Supply

    Thanks friend.... i couldn't see it :-(  .So what do you suggest me to look for????? Do you think that the transistor that you told me to change makes all this problems???? Sorry if i have become bothersome
  3. A

    0-30 Vdc Stabilized Power Supply

    Thanks a lot for your answer!!!!!!Well tommorow i will go to buy a tip31a and i will tell you the results. When i said tlo's i meant U1, U2, U3 = TL081, operational amplifier... "The pcb in the project already has R13 connected to the positive supply" i can't see this connection in the pcb could...
  4. A

    0-30 Vdc Stabilized Power Supply

    Dear friends..... I built this power supply but i failed to make it work.....I don't know why and i hope to help me!!!!!Well the first time i gave power the output voltage was ok.and the ampere control was ok(the led was on in the fully clockwise turn).After 1 minute the voltage was 9- 22,5-...
Top