probably another capacitor question.

[theChris]

as with any search for info on caps on this forum, well, is there a post not involving caps? possibly...

anyway, i am a college student in the US, and am trying to blow my tax refund. I have just started with all of this. i made a test circut for a crossover and got some ossilation at 100MHZ as well as really bad results... in fact the results were REALLY bad.

I have decided the fully built unit will likey require bypass capacitors...

i found some 10uF electrolytic caps pretty cheap, like 0.05 each.
the 0.01uF ceramic caps are 0.10 each. while that does't seem like much, the cap bypassing will soon cost as much as the op amps... so will monolithic caps work? they are much cheaper at like 0.03 each. also, the high voltage mylar caps are 0.10. not sure which is better.

also, the input buffer has a 1uF cap listed. i found:
1µF 63V Metallized Polyester Film Cap
and
1uF 100V High Voltage Mylar Cap

no mention of tolerance. i will test the caps and use whichever are closest matches.

any preferance? both are 0.20 each, which is fine because i don't need many.

i know the prices look trivial, but this stuff adds up fast!

[Sch3mat1c]

Geez! How many rooms did you fill with op-amps!? I can't imagine how anyone could spend more than $10 on ceramic bypass caps...

Tim

[theChris]

yeah, but i read you should use both electrlytic and ceramic caps, so i get $0.30 per dual opamp that cost $0.50.

[Sch3mat1c]

I may not be into SS, but AFAIK all you need is a little cap (.1uF ceramic for instance) to keep the chip stable.

After all, the wires leading to the chip will probably have less inductance than the electrolytic, so might as well keep that much at the main supply filter (or group them together at the PSU header on the board or whatever).

Tim