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Quieter DC Mixing
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samwise_ganja



Joined: Jun 30, 2016
Posts: 7
Location: st. petersburg

PostPosted: Thu Jun 30, 2016 12:51 pm    Post subject: Quieter DC Mixing Reply with quote  Mark this post and the followings unread

Hi there - I had a design question, maybe can be helped. I'm using an operational amplifier as a summing mixer. I'd like to keep the DC components in play, so I don't have capacitors on the inputs.

This causes noisy spikes when the pot reaches Ground and when it reaches Ground, the circuit isn't very silent.

Can anyone explain why this happens and maybe if there are some solutions for "quieter" DC mixing?
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Fri Jul 01, 2016 2:26 am    Post subject: Reply with quote  Mark this post and the followings unread

welcome party!

What kind of powersupply are you using, a single or dual supply ?

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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
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PostPosted: Fri Jul 01, 2016 9:41 am    Post subject: Reply with quote  Mark this post and the followings unread

It helps a lot if you add schematics to your post/question.
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