Paradise Builders

[hesener]

Originally Posted by quan

Thanks Alfred, can you post a picture how it is implemented if it is not too much trouble?
Quan

sure no problem, this will take a couple days as I am busy but I will include this

[Libby123]

Originally Posted by FdW

O.k. to 4 decimals

Right, but whats that -4V at V+ 6800uF about?

What might be wrong?

[FdW]

Originally Posted by Libby123

Right, but whats that -4V at V+ 6800uF about?

What might be wrong?

Libby123, I do only answer questions regarding the PSU. And at some moments that is a day-job in itself.

[hesener]

Originally Posted by Libby123

Right, but whats that -4V at V+ 6800uF about?

What might be wrong?

could the PNPs be broken? Please check the voltage across R5 and R14 (both ends each, please), thanks

[Libby123]

Originally Posted by hesener

could the PNPs be broken? Please check the voltage across R5 and R14 (both ends each, please), thanks

So I took it.
TP5 and 6 both are 16,55V
TP9 and 10 both are -16,08V
with the 2 220Ohm resistors the upper one (next to J310) -15,32V
the lower one (next to 1M R) -18,11V

[Libby123]

Originally Posted by FdW

Libby123, I do only answer questions regarding the PSU. And at some moments that is a day-job in itself.

Oh, sorry. this should not be critisism. PSU is fine. But big Thanks for help.

[FdW]

Originally Posted by Libby123

Oh, sorry. this should not be critisism. PSU is fine. But big Thanks for help.

Do not worry, it was just to state my 'purpose' here, no critique was taken

[hesener]

Originally Posted by Libby123

So I took it.
TP5 and 6 both are 16,55V
TP9 and 10 both are -16,08V
with the 2 220Ohm resistors the upper one (next to J310) -15,32V
the lower one (next to 1M R) -18,11V

OK thanks. That was not what I was looking for, but helpful. It looks like you have a huge imbalance in the input stage, that cannot be explained with transistor mismatch alone. Can you please check the emitter voltage of Q29 / Q26 / Q25 / Q2 to GND?
While you are at it, please also measure the emitter voltage of the NPNs (Q32 / Q31 / Q30 / Q1)? many thanks

[Libby123]

Originally Posted by hesener

OK thanks. That was not what I was looking for, but helpful. It looks like you have a huge imbalance in the input stage, that cannot be explained with transistor mismatch alone. Can you please check the emitter voltage of Q29 / Q26 / Q25 / Q2 to GND?
While you are at it, please also measure the emitter voltage of the NPNs (Q32 / Q31 / Q30 / Q1)? many thanks

The voltage of Q29 / Q26 / Q25 / Q2 is always -3,8V and Q32 / Q31 / Q30 / Q1 is -4,8V.

[hesener]

Originally Posted by Libby123

The voltage of Q29 / Q26 / Q25 / Q2 is always -3,8V and Q32 / Q31 / Q30 / Q1 is -4,8V.

sorry but thats impossible. is the input shorted, or connected to GND with a low ohmic resistor? Then, the emitter votlage is the voltage from the connection between transistor and 33Ohm resistor, to GND / simply put the black cable of the DMM to Ground, and use the red cable to check all 8 emitter voltages..... thanks a lot and sorry if I have not said clearly enough whats needed...