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AIUI, it is "good practice" to put a cap from DC rail to ground, right next to any opamp or transistor/JFET.
Is there a "rule of thumb" for deciding what value this cap should be - say, related to the voltage on the DC rail ... and/or the current going through the device?
I'm currently using 2x 22uF Wima MKS4 for this purpose, on a +24v rail and these take up a fair bit of real-estate ... so I was wondering if 1x 22uF Wima would be fine - or even less? This is for JFET pairs & quads passing either 10 or 20ma in total.
Thanks,
Andy
Follow Ups:
10µF + 0.1µF is standard practice.
Is this irrespective of how many ma are going through the device next to the shunt cap?
Regards,
Andy
Pretty much so.
10uF / 0.1uF it is, then.
Regards,
Andy
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