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 Forum index » DIY Hardware and Software » Developers' Corner
CV control for a sine wave osc needed!
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matiasbru



Joined: Nov 18, 2017
Posts: 2
Location: Berlin

PostPosted: Sat Nov 18, 2017 8:06 am    Post subject: CV control for a sine wave osc needed! Reply with quote  Mark this post and the followings unread

Hi guys, i'm not sure about if this is the right channel to post this question, but here it goes.

I have this very simple sinewave osc, and i'm trying to control the frequency using CV.
Do you have any suggestion about how can i do this?

Thanks!


little-bass.jpg
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Sinewave OSC
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JovianPyx



Joined: Nov 20, 2007
Posts: 1678
Location: West Red Spot, Jupiter
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PostPosted: Sat Nov 18, 2017 9:16 am    Post subject: Reply with quote  Mark this post and the followings unread

I assume the 50K pot controls the pitch. You could try to replace the pot with a vactrol or something like H11F1. I'm not sure what the response would be like, that is, if it will track linear or expo - I've no idea, but exact pitch may not matter to you.

Also, posting a schematic rather than a layout would be better for us to see what is going on. In the image, there are things that are hidden from view (under the transistor).

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matiasbru



Joined: Nov 18, 2017
Posts: 2
Location: Berlin

PostPosted: Sat Nov 18, 2017 11:42 am    Post subject: Reply with quote  Mark this post and the followings unread

JovianPyx wrote:
I assume the 50K pot controls the pitch.


That's correct!

Here it goes the schematic with the same sine osc but x3.
(Actually, this x3 version is the one that i'm using right now).


subaq_esquema.png
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Blue Hell
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Joined: Apr 03, 2004
Posts: 22545
Location: The Netherlands, Enschede
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PostPosted: Sat Nov 18, 2017 5:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

As long as you don't care for exact tuning .. what Scott said .. a vactrol or an FET .. otherwise this oscillator type would not not be very suitable ... also there seems to be an Emitter Collector reversal in the schematic with the three oscillators?

and also welcome Smile

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JovianPyx



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Posts: 1678
Location: West Red Spot, Jupiter
Audio files: 191

PostPosted: Sat Nov 18, 2017 5:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

heh - yes, looks like you reversed emitter and collector in the schematic.
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