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In Reply to: RE: 10-20uf across op amp PS? posted by Tweaker456 on March 29, 2016 at 09:27:42
If you refer to the capacitance that is generally placed across from pins that I think are labeled "V+" and "V-", the typical value is 0.1uF or less, and the typical type is ceramic, because you want a capacitor that does not become inductive at very high (ultrasonic) frequencies. Are you looking at a schematic? If not, why do you want to use such a large capacitance? It's also important to keep the leads short, which may be difficult with such a large part. It might even be a negative to use such a large value.
Follow Ups:
Lew, Can you please elaborate on the inductive at high frequencies thing and what the consequences of that would be sonically. Thanks, Tweaker
Capacitors, like everything else, are not perfect. A perfect cap would have a falling Z that was linear with frequency. A real cap has a 'U' shaped Z, where the Z falls with increasing frequency, and then at some point (depending on construction and value) the Z will start to rise due to lead inductance. The larger the cap value, the lower in frequency this happens. This info is on the internet. Look for it.
Lew, I emailed someone about op amp sound and one of my concerns sound wise and he emailed me back with this idea. I put a .1 Wima MPK10 across it. Don't know how inductive is is. Been idling for a few hours. I'll listen to it soon. Don't know if there is any oscillation because I don't have a scope and I haven't seen any smoke for over a week. You think a ceramic would sound better?? Thanks, Tweaker
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