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 Forum index » DIY Hardware and Software
Add sync to LFO
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isak



Joined: Dec 13, 2009
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PostPosted: Sun Sep 22, 2013 7:41 am    Post subject:  Add sync to LFO Reply with quote  Mark this post and the followings unread

Hi Guys.

i have this great MFOS LFO which i love very much, i want to add to it (if its possible) a gate in for it to be synced with a sequence.
is it possible?
any idea on how to do it?

the scheme is attached below...

thank you in advance.
cheers,
Isak E.


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modulus in moduli



Joined: May 14, 2010
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PostPosted: Mon Sep 23, 2013 10:50 am    Post subject: Re: Add sync to LFO Reply with quote  Mark this post and the followings unread

Isak,

This looks like an integrator with schmitt-trigger tri-core oscillator. You'd have to build reset circuitry for both capacitors and the schmitt trigger.

It is much easier to add a sync to a saw-tooth oscillator. The reset circuitry is already there and you would only have to add an extra input to that.

Unless somebody has a better idea I think it would be easier to build a second LFO with reset than to add a reset to this one.
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isak



Joined: Dec 13, 2009
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PostPosted: Mon Sep 23, 2013 11:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for your reply.

Can you please show or attach the reset circuit and please show me on the scheme where should I connect it exactly?

I thank you in advance.

Cheers.

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feggster



Joined: Sep 12, 2011
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PostPosted: Mon Sep 23, 2013 12:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

maybe the sync circuit from tim servo ?
http://electro-music.com/forum/topic-49081-25.html
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isak



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PostPosted: Mon Sep 23, 2013 9:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for the link Smile

If I ubderstand this correctly I need to connect Tim scheme between the C1 and C2 in MFOS scheme, right?
Any direct replacement to the 2N3819?

Cheers

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modulus in moduli



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PostPosted: Wed Sep 25, 2013 10:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Good find, feggster! And very interesting circuit.

Isak, the 8k LFO is so similar to the schematic you presented that this has a good chance of working.

C1 in Tim's circuit is your C21, and then C22 will automatically be connected when engaged. It looks like the 2N3819 JFET is used as a switch so that any JFET should work.
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isak



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PostPosted: Wed Sep 25, 2013 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool! Thank you Smile

I'll try that (hope soon) and report back.
Thank you for the help guys.

Cheers.

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