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 Forum index » DIY Hardware and Software
Buffering cv and gate.
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isak



Joined: Dec 13, 2009
Posts: 696
Location: Israel
Audio files: 18

PostPosted: Tue Jan 15, 2013 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you, I will fix the scheme.
Do you or any of you guys know if there is a triple 1M log pot?
I know there is a dual one but Iv'e never saw triple one.
Cheers.

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elmegil



Joined: Mar 20, 2012
Posts: 1475
Location: Chicago
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PostPosted: Tue Jan 15, 2013 5:45 am    Post subject: Reply with quote  Mark this post and the followings unread

I've never seen one either. Dual is common enough because it's used for stereo volume.
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isak



Joined: Dec 13, 2009
Posts: 696
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PostPosted: Tue Jan 15, 2013 6:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.

I fixed the scheme and went for sure!
2 OPA's, U1 and U2.
I used the 2 remaining stages for buffering the gate.
Is it ok?

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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inlifeindeath



Joined: Apr 02, 2010
Posts: 315
Location: Albuquerque, NM

PostPosted: Mon Apr 01, 2013 9:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

alright dudes, i'm gonna throw another question into this thread Smile

I built a MiniCV module into a stand alone box with the idea of adding voltage buffers to get multiple CV outs. I know the buffers are necessary because the output CV gives me tracking errors when sending it to multiple VCOs.

Here's the issue... I am running the Midi to CV convertor off a 9 volt battery. I assumed I could use an LM324 for the buffers, and since the signal is DC, I wouldn't need a VCC/2 reference, just run it off V+ and GND.

Seeing as the LM324 will most likely only go as low as 0.3 V, and the lowest CV output will be 0.16V, I'm hesitant to go this route.

Can anyone suggest an alternative solution, or verify that I don't know what I'm talking about and the LM324 unity buffers will suit my needs?

Thanks!!!

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johncronan



Joined: Feb 24, 2013
Posts: 42
Location: Chicago

PostPosted: Tue Apr 02, 2013 12:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

If you do a lot of single-supply stuff with op amps, I would recommend the more recent (but still very common) IC, LMC660. Its output swing gets much closer to ground than the LM324.

-John
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bubzy



Joined: Oct 27, 2010
Posts: 552
Location: United Kingdom
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PostPosted: Wed Apr 03, 2013 4:28 am    Post subject: Reply with quote  Mark this post and the followings unread

looks like that chip is pin compatible too
BUUUUUT
its flaming expensive in comparison...

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johncronan



Joined: Feb 24, 2013
Posts: 42
Location: Chicago

PostPosted: Wed Apr 03, 2013 8:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah it's not cheap. The other thing that comes to mind is you could use 4 source followers.
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