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Old 20th February 2020, 01:50 AM   #11091
Destroyer OS is offline Destroyer OS  United States
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Did you have a low inductance load right on the output of the capacitor multiplier? If not you should add a capacitor with a little bit of ESR but low inductance real close to it.
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Old 20th February 2020, 01:55 AM   #11092
jackinnj is offline jackinnj  United States
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Quote:
Originally Posted by Destroyer OS View Post
Did you have a low inductance load right on the output of the capacitor multiplier? If not you should add a capacitor with a little bit of ESR but low inductance real close to it.
Please, always snub a cap multiplier.

Any inductance after a regulator or cap-multiplier is like putting on dirty underwear after a refreshing morning shower.

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another reason to have Horowitz & Hill, The Art of Electronics V3 on your bookshelf!
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Old 20th February 2020, 02:02 AM   #11093
keantoken is online now keantoken  United States
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A good standard troubleshooting method is to record the voltage at each transistor/chip pin, then it should be easy to tell if something is wrong. You can do the same with AC readings to see where the signal stops or noise begins.
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Old 20th February 2020, 08:01 AM   #11094
RCruz is offline RCruz  Switzerland
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Would you please suggest a model ?
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Old 20th February 2020, 03:06 PM   #11095
Joachim Gerhard is offline Joachim Gerhard  Germany
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ZTX851, 951
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Old 21st February 2020, 08:18 PM   #11096
Joachim Gerhard is offline Joachim Gerhard  Germany
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This time I have luck. The circuit in post 11082 worked right away.
The only difference is that I use a conventional plus-minus supply.
That has a disadvantage. Input and output offset has to be trimmed.
I simply made the two supply voltages as similar as a could with a simple trimmer.
There is is a bit of hum. That partly comes from the mains transformer that is in board and partly from the PSSR that is not that great.
I have a solution for this that I will try now.
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Old 21st February 2020, 08:21 PM   #11097
Joachim Gerhard is offline Joachim Gerhard  Germany
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Sorry 11083.
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Old 22nd February 2020, 12:05 PM   #11098
Joachim Gerhard is offline Joachim Gerhard  Germany
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Building constant current sources for better PSRR and less distortion.
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Old 22nd February 2020, 01:06 PM   #11099
Joachim Gerhard is offline Joachim Gerhard  Germany
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It works
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Old 22nd February 2020, 01:54 PM   #11100
RCruz is offline RCruz  Switzerland
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ZTX851, 951
Very low Vcesat.... that means low Rcesat... very good

Do you know if they make a dual NPN/NPN and dual PNP/PNP version ?
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