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 Forum index » DIY Hardware and Software » YuSynth
Yusynth VC-LFO : adding exponential FM reponse
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Wed May 30, 2007 6:19 am    Post subject: Yusynth VC-LFO : adding exponential FM reponse Reply with quote  Mark this post and the followings unread

http://yusynth.net/Modular/index.html

Hi,

I plan to swap one MFOS VCO modified into LFO (not very satisfying…) by Yves Usson VC-LFO, which features a sync option.

A friend build it and it is great ; it’s been a long time we were seeking for a VC version of LFO around here…

But I have to admit there is something i’m about to regret.
My version of MFOS LFO has a optional switch which affects FM CV input response (LINEAR or EXPONENTIAL)…which is far from optional indeed.

Do you think it would be possible to implement linear control over this design ?

Sticking a BC547 npn transistor ?

Cheers


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yusynth



Joined: Nov 24, 2005
Posts: 1224
Location: France

PostPosted: Wed May 30, 2007 11:35 am    Post subject: Re: Yusynth VC-LFO : adding exponential FM reponse Reply with quote  Mark this post and the followings unread

funkyfarm wrote:
.

Do you think it would be possible to implement linear control over this design ?

Sticking a BC547 npn transistor ?


No replacing the PNP by a NPN would not work.
If you want a linear control the circuit needs a complete redesign. The way to do it would be to disconnect the emiter pin from the positive power rail,
insert a resitor in between, removing R7, disconnecting R5 from the output of the OPA and connecting R5 to the emitter and recalculate all the resistor values, you would have to redesign a complete PCB for it...

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