Recent content by Marek1

  1. Marek1

    0-30 Vdc Stabilized Power Supply

    Hi Yes, I said without U2 the voltage at pin 6 is the same at is pin 3. I agree from this that pin6 shouldn't do that. I lifted D9 and r9, at pin 3 is 0V -good. Adjust at pin 6 is still from 0 to 11 V- and this is bad. And i found solution. I had micro short-circuit at r8 and r15. Thank You...
  2. Marek1

    0-30 Vdc Stabilized Power Supply

    Hi again. I know that U2 is placed correctly. I changed U1,U2,U3 I use 22kOhm pot. Maybe some measure points will help me? On board beetwen 6 and 3 pin U2 i have 28 Kohm on multimeter, beetwen pin 2 and collector Q4 is 25Kohm. Something is wrong, and I don't know what :( Regards Marek
  3. Marek1

    0-30 Vdc Stabilized Power Supply

    HI 1) 22 V AC (28 DC on capacitor C1) about 5A 2) I build standard project 0-30V 0-3A 3 )Yes i substitute Q3 with BC556,Q2 with BD243C and r15 with 100 ohm. I nowhere can find 2n2219 or Tip29, Tip31. 4) I didn't load output 5) No , LED is not light 6) voltage at the slider of the voltage adjust...
  4. Marek1

    0-30 Vdc Stabilized Power Supply

    Does it works? I have problems with this projects. Adjustment of Voltage jumps somehow . Anybody can help me please? AC is 22V, 28 DC. On begin adjustment i have 0V and suddenly jump to 28V and on the end range potentiometer is 16V
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