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 Forum index » DIY Hardware and Software » YuSynth
VCA on forever
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isak



Joined: Dec 13, 2009
Posts: 847
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PostPosted: Thu Jul 11, 2013 3:26 pm    Post subject: VCA on forever Reply with quote  Mark this post and the followings unread
Hi Yves.

i want the VCA will be always open.
how would i do that?
can i connect 5V direct to the CV in with an ON/OFF switch?

cheers,
Isak E.
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Benjamin AM



Joined: Nov 04, 2010
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PostPosted: Thu Jul 11, 2013 7:18 pm    Post subject: Reply with quote  Mark this post and the followings unread
Turn up the gain knob.
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isak



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PostPosted: Thu Jul 11, 2013 11:22 pm    Post subject: Reply with quote  Mark this post and the followings unread
Sorry I don't understand...
The gain pot is the master vol of the vca, no?

EDIT:
ok, I gusse not, I looked at the scheme again and see the gain connected to 15V.
I'll just put a toggle switch instead the pot.

Cheers.
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isak



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PostPosted: Fri Jul 12, 2013 12:43 am    Post subject: Reply with quote  Mark this post and the followings unread
Another Q..

I want a switch that I can move from Env to gate.
What would the right way to do it?
My thought was to connect the gate through 1nF to the cv in just not to get clicks on the start of the note when pressing the keyboards.
Is this the right way to go?

Cheers.
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Benjamin AM



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PostPosted: Sun Jul 14, 2013 5:37 pm    Post subject: Reply with quote  Mark this post and the followings unread
Quote:
My thought was to connect the gate through 1nF to the cv in just not to get clicks on the start of the note when pressing the keyboards.

Isak, I believe that this will not work for what I understand that you want to accomplish.
Here is my suggestion for you. I am assuming that you plan on using the Yusynth VCA and that your gate output is 10V. I'll let you figure out the switching part, it is easy. Essentially you will have to run an envelope generator to one input of the VCA and a gate to the second input. The gate would be interrupted by the circuit that I've attached. This should add a small lag and release to the gate that will reduced the clicking effect that you wish to get rid of. This circuit will cut the gate level in half. To compensate, adjust the input resistor(R20 originally 68k) in the VCA circuit to something like 33k or 36k. Hope that helps.

Gate VCA.bmp
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isak



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PostPosted: Sun Jul 14, 2013 9:05 pm    Post subject: Reply with quote  Mark this post and the followings unread
Thank you for yor replying on this matter.
Actually my gate is 5V, it's from acx midi to cv lite http://www.acxsynth.com/midi2cvlite/midi2cvlitefr.htm
Any modification cause of the 5V?
if I understand this correctlly it will cut the 5V gate to half, what means it will be 2.5V, that I'm almost sure it's not enough to run through the cv in.

Right?
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isak



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PostPosted: Sat Aug 03, 2013 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread
Benjamin AM wrote:
Quote:
My thought was to connect the gate through 1nF to the cv in just not to get clicks on the start of the note when pressing the keyboards.

Isak, I believe that this will not work for what I understand that you want to accomplish.
Here is my suggestion for you. I am assuming that you plan on using the Yusynth VCA and that your gate output is 10V. I'll let you figure out the switching part, it is easy. Essentially you will have to run an envelope generator to one input of the VCA and a gate to the second input. The gate would be interrupted by the circuit that I've attached. This should add a small lag and release to the gate that will reduced the clicking effect that you wish to get rid of. This circuit will cut the gate level in half. To compensate, adjust the input resistor(R20 originally 68k) in the VCA circuit to something like 33k or 36k. Hope that helps.


ok, did that, the Level was reduced as you said, but i can still hear clicks when releasing the keys.
maybe i need to increase resistor value or cap value?

some sound clips..

cheers.

clicks.wav
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isak



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PostPosted: Sun Aug 04, 2013 4:12 am    Post subject: Reply with quote  Mark this post and the followings unread
ok, i found something calls a "Slew Limiter".
maybe it can help me with the gate clicks?

slew.jpg
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slew.jpg

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isak



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PostPosted: Mon Aug 05, 2013 1:38 am    Post subject: Reply with quote  Mark this post and the followings unread
the slew limiter helped Cool
clicks is totally gone!!!
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