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Skazi 3rd February 2010 12:01 AM

Capacitor on Opamp Power Pins in Gwado CMoy
In the Gwado CMoy design, there are small capacitors attached to the opamp power pins. What do these capacitors accomplish?

nigelwright7557 3rd February 2010 12:42 AM

Decouple the op amp from power supply noise.

Skazi 4th February 2010 06:54 PM

Are electrolyic or film caps or something else better for this purpose? Is there any benefit or detriment to using bigger capacitance? 0.1uF is what's used in the Gwado schematic.

Thanks for the help :)

TheSeekerr 6th February 2010 03:07 PM

You're trying to filter high frequency noise, so a small cap is most useful here - I tend to use X7R ceramics of about 0.1uF (+/- 50% depending on what I have around).

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