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 Forum index » DIY Hardware and Software » YuSynth
Mixer needed for 2 filters?
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sun Jun 09, 2013 12:16 pm    Post subject: Mixer needed for 2 filters? Reply with quote  Mark this post and the followings unread

Hi,
I am building a synth with two filters.
Here is my question:

Can I just add the two outputs of each filter or do I have to build a mixer, even if I don´t want to adjust the volume of each filter since I got a "reverse crossfade" (one input to two outputs) before the filters?

Hope someone of you could help me. Smile
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gdavis



Joined: Feb 27, 2013
Posts: 124
Location: San Diego

PostPosted: Tue Jun 11, 2013 1:17 pm    Post subject: Re: Mixer needed for 2 filters? Reply with quote  Mark this post and the followings unread

El Mop wrote:
Hi,
I am building a synth with two filters.
Here is my question:

Can I just add the two outputs of each filter or do I have to build a mixer, even if I don´t want to adjust the volume of each filter since I got a "reverse crossfade" (one input to two outputs) before the filters?

Hope someone of you could help me. Smile


If you want to combine the two filter outputs into one signal path, the "proper" thing to do would be to just use a normal crossfade (two inputs to one output) after the filters. I don't see a reason to put a reverse crossfade before the filters.

But to do it your way yes, you need a mixer (you never want to connect two outputs directly together), but it could be as simple as a 100k resistor on the output of each filter depending on what you're connecting it to. You might want a buffer to make it more flexible in a modular system.

If you're going from the filters to a VCA, the Yusynth VCA has two inputs that are mixed at the input buffer so you wouldn't even need to do anything extra, just connected each of the filter outputs to one of the inputs.

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My synth build blog: http://gndsynth.blogspot.com/
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sat Jun 15, 2013 3:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you!
I was thinking a bit in a wrong direction.
You are right, a crossfade after both filters would make more sense.
Thank you again!
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