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Old 23rd January 2013, 10:05 AM   #1241
hesener is offline hesener  Germany
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Originally Posted by quan View Post
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
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Old 23rd January 2013, 02:58 PM   #1242
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Originally Posted by FdW View Post
O.k. to 4 decimals
Right, but whats that -4V at V+ 6800uF about?

What might be wrong?
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Old 23rd January 2013, 03:27 PM   #1243
FdW is offline FdW  Netherlands
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Originally Posted by Libby123 View Post
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.
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Old 23rd January 2013, 03:36 PM   #1244
hesener is offline hesener  Germany
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Originally Posted by Libby123 View Post
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
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Old 23rd January 2013, 07:03 PM   #1245
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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
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Old 23rd January 2013, 07:04 PM   #1246
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Originally Posted by FdW View Post
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.
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Old 23rd January 2013, 07:08 PM   #1247
FdW is offline FdW  Netherlands
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Originally Posted by Libby123 View Post
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
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Old 24th January 2013, 01:22 PM   #1248
hesener is offline hesener  Germany
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Originally Posted by Libby123 View Post
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
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Old 24th January 2013, 07:48 PM   #1249
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Originally Posted by hesener View Post
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.
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Old 25th January 2013, 12:09 PM   #1250
hesener is offline hesener  Germany
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Originally Posted by Libby123 View Post
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...
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