Capacitor on Opamp Power Pins in Gwado CMoy - diyAudio
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Old 3rd February 2010, 12:01 AM   #1
Skazi is offline Skazi  United States
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Default 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?
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Old 3rd February 2010, 12:42 AM   #2
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Decouple the op amp from power supply noise.
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Old 4th February 2010, 06:54 PM   #3
Skazi is offline Skazi  United States
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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
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Old 6th February 2010, 03:07 PM   #4
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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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