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DIY Stompboxes => Building your own stompbox => Topic started by: thumposaurus on May 05, 2004, 06:47:12 PM

Title: CV Contrtolled Feed-back Looper?
Post by: thumposaurus on May 05, 2004, 06:47:12 PM
I was trying out some different pedals with my Theremax earlier, and got to thinking that a feed-back looper could come in quite handy if the pot was replaced with a CV controled circuit, might be good for old analog synth guys too.
But I have no idea on where to start looking for an appropriate controller circuit.  
Any tips or ideas on where to start with this?
Title: CV Contrtolled Feed-back Looper?
Post by: el duderino on May 05, 2004, 06:52:10 PM
you should check out the total sonic anihilation might help for a good basis...... :shock:
Title: CV Contrtolled Feed-back Looper?
Post by: thumposaurus on May 05, 2004, 09:58:28 PM
Well I've been sitting around thinking about this, theroretically I should be able to just replace the pot with a jack, yes?  I used my multi-meter and plugged a cord into the one CV output and got some readings off of it I think I have enough jacks and another box laying around I may just try and build one tommorrow and see how it works out.  
but off to bed now.
Title: CV Contrtolled Feed-back Looper?
Post by: ExpAnonColin on May 05, 2004, 10:23:11 PM
Noooo...  To convert the CV voltage of your theremin device to resistance, as an easiest method, you should wire an LED up to it.  Play with resistor values across the LED to get the LED to be brightest when you're closest to the antenna, or whichever way it will go.  Then, take a photocell and make yourself a little optocoupled photoresistor.  Use the leads of the photocell in place of the pot. That should work reasonably well as long as you match your LDR value well.

-Colin
Title: CV Contrtolled Feed-back Looper?
Post by: puretube on May 06, 2004, 02:30:33 AM
if I understood the problem right, you find some info/ideas at GEO here:
http://www.geofex.com/Article_Folders/VCA%20Applications.pdf