Capacitor on Opamp Power Pins in Gwado CMoy

Skazi · 2nd February 2010, 11:01 PM

In the Gwado CMoy design, there are small capacitors attached to the opamp power pins. What do these capacitors accomplish?

nigelwright7557 · 2nd February 2010, 11:42 PM

Decouple the op amp from power supply noise.

Skazi · 4th February 2010, 05:54 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, 02:07 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).

2nd February 2010, 11:01 PM	#1
Skazi diyAudio Member Join Date: Jan 2010 Location: Minneapolis, MN	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?

2nd February 2010, 11:42 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Decouple the op amp from power supply noise. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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4th February 2010, 05:54 PM	#3
Skazi diyAudio Member Join Date: Jan 2010 Location: Minneapolis, MN	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

6th February 2010, 02:07 PM	#4
TheSeekerr diyAudio Member Join Date: Jan 2008	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).