Simple Symetrical Amplifier

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#3,881
PauloPT said:
Do you find the servo doesn't impact negatively the sound?
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The most common error is to consider servos outside from the signal path. They are in. So it is necessary, if you are looking for the best performances (and sound quality) to care about the IC performance (ultra low distortion and noise) and cap quality. If you achieve-it, and if the FC of the servo is low enough to have no phase shift in the audio range, you will have no change on sound signature.
 
#3,882
The most common error is to consider servos outside from the signal path. They are in. So it is necessary, if you are looking for the best performances (and sound quality) to care about the IC performance (ultra low distortion and noise) and cap quality. If you achieve-it, and if the FC of the servo is low enough to have no phase shift in the audio range, you will have no change on sound signature.]
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Has this servo being designed in such a good way? Should I go for this circuit?
 
#3,888
PauloPT said:
Does a different opamp requires changes to circuit (compensation caps or others) or can I just swap the opamp leaving the circuit unaltered?😕
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Tl 072 was a dual OPA, one side not used, not very elegant. So , you will have to modify the board accordingly to feat a single OPA. All OPAs have the same pin-out, but differs from single to dual.
You can chose the ones you want, as long as they are fet Inputs, and unity gain stable. Just add, on the printed circuit a compensation cap in // with the feedback resistance, that you will use, or not.
 
#3,891
To servo or not to servo?

I was reading some old - and other not so old - threads about servos and I'm having second thoughts. Seems to be the servos always add something to the audio signal. The question is - is it audible? I don't have the experience to know this. I fell in love with the SSA and I don't want anything to spoil it's beautifull sound! But again, my speaker protection circuit is only trigered if the amp outputs more than 0.7V of dc. Perhaps not today or tomorrow or next week but what if in a few months the output goes 0.5V dc? There goes woofers... So, to servo or not to servo?😕
 
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#3,893
PauloPT said:
I'm afraid I can't... The schematics weren't published only the pcb layout here:
http://www.diyaudio.com/forums/solid-state/193923-simple-symetrical-amplifier-343.html#post3202016
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Ok, just to change the implantation for single OPA.
Don't worry about signal degradation, just audiophile stupidity, it works outside from the audio bandwitch. Just use film cap and good OPA. You take no risk, as you can remove-it any time.

If you use double OPA, please use this schematic.
http://www.diyaudio.com/forums/solid-state/193923-simple-symetrical-amplifier-22.html#post3205884

If you'll use a single OPA, i can try to modify the layout for it.
 
#3,894
Ok, just to change the implantation for single OPA.
Don't worry about signal degradation, just audiophile stupidity, it works outside from the audio bandwitch. Just use film cap and good OPA. You take no risk, as you can remove-it any time.
Click to expand...
Great!🙂 Thanks!🙂

If you'll use a single OPA, i can try to modify the layout for it.
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That would be great too!😎 I have some single opamps opa132 and opa267 in my parts bin

Thank you
 
#3,895
here it is:
 

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