Please explain why this capacitor exists in mic preamp

Alex Beloff

Other Parts Discussed in Thread: OPA322

Hi!

I tried to make a PCB for this preamp - with no luck. I tried the 5V version (with OPA322 amplifier, p.19). And one thing I notices there's a C1 on the Electrical Schematic (p.21) but it doesn't exist on any other circuit in the document. Can someone please explain what is it for?

Thank you! -

over 5 years ago

0 Alex Beloff over 5 years ago

Intellectual 570 points

I mean I made the whole circuit but it doesn't seem to work... And I don't have any idea why. I think I understand everything except for the C1.

0 Tim Claycomb over 5 years ago in reply to Alex Beloff

TI__Genius 15410 points

Hi Alex,

Capacitor C1 is used as a bulk decoupling capacitor. This capacitor is common on boards to decouple the power supplies as soon as the supply enters the board, then smaller (0.1uF) capacitors are used as local decoupling capacitors.

Thank you,

Tim Claycomb

0 Alex Beloff over 5 years ago in reply to Tim Claycomb

Intellectual 570 points

Thank you! Good to know!

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Please explain why this capacitor exists in mic preamp