MPP

[RCruz]

if you go to batteries -- new fully charged NiCd -- good luck finding them (readily available over here.)

Why would you use nicd ?

 

[RCruz]

Why not nimh ?

 

[Joachim Gerhard]

This is the corrected schematic.

 

[jackinnj]

Why would you use nicd ?

Lowest noise per volt, Nimh comes in second. See Hoffmann "Noise Measurements of Chemical Batteries"

 

[Joachim Gerhard]

This is a version with a diamond input.

 

[RCruz]

Lowest noise per volt, Nimh comes in second. See Hoffmann "Noise Measurements of Chemical Batteries"

Thank you

 

[RCruz]

This is a version with a diamond input.

I like the Broskie version

 

[Joachim Gerhard]

The Original has less distortion But the Diamond can be improved, so can the Original.

 

[RCruz]

What type of transistors would be good for the ips ?

 

[Joachim Gerhard]

Zetex

 

[Destroyer OS]

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.

 

[jackinnj]

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.

Zetex

another reason to have Horowitz & Hill, The Art of Electronics V3 on your bookshelf!

 

[keantoken]

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.

 

[RCruz]

Zetex

Would you please suggest a model ?

 

[Joachim Gerhard]

ZTX851, 951

 

[Joachim Gerhard]

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.

 

[Joachim Gerhard]

Sorry 11083.

 

[Joachim Gerhard]

Building constant current sources for better PSRR and less distortion.

 

[Joachim Gerhard]

It works

 

[RCruz]

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 ?