Recent content by sobol

  1. S

    0-30V Stabilized Power Supply

    Can I increase output voltage with voltage calibration trimpot without any consequences? Or it's not recommended?
  2. S

    0-30V Stabilized Power Supply

    I have fixed my ps, P1 was wrongly soldered. I have believed that pin order in pcb is correct... it's not. Inverting or non-inverting input?
  3. S

    0-30V Stabilized Power Supply

    I replaced it with 3 other opamps, and the effect is still the same.
  4. S

    0-30V Stabilized Power Supply

    Does someone have any ideas what's wrong with my circuit?
  5. S

    0-30V Stabilized Power Supply

    TLE2141IP opamps. So... R7 looks good to me, its 0,47ohm, 10W resistor, connected from the GND "cross" on the pcb to the output GND pad. I've checked this U3 and it works in weird way. As i wrote before, voltage on the 3rd pin of U3 changes from 0 to 1,3V depending on P2 position. BUT on the...
  6. S

    0-30V Stabilized Power Supply

    Power supply is soldered on normal PCB. OK, I've made some measurements, look at the result: U1 pin 6 (output) - 11.2V. U3 pin 3 - varies from 0 to 1.3V, depends on P2 position. 10V zener diode works properly, there is 29V on emitter of Q3 while current limiter works, and 29V on pin 7 of U3. U3...
  7. S

    0-30V Stabilized Power Supply

    Version from the first post (latest i believe), 28VAC transformer, TLE2141 opamps. I'll check it tomorrow and i'll post measurements. I'll focus on the U3 neighbourhood, maybe I will find a mistake. If its ok, i'm ok too. : D
  8. S

    0-30V Stabilized Power Supply

    So, I have built that power supply, but after test run i've found what follows: P1 (voltage control pot) - without a load on the output i've got 7mV to 5V, and at maximum pot position current limiting turns on (while P2 is on the maximum, while less, current limiting is constantly turned on and...
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