[sdiy] CV pedal for Filter Factory

[Ron Malleis]

I just made one of these for my Filter Queen (I'm assuming what you need is
equivalent to the "expression pedal" 1/4" TRS jack on the Filter Queen).  I
just used a volume pedal that I had lying around, and added a TRS jack,
wiring the tip connector to one end of the slide pot, and the ring to the
other)-works like a charm :^P  It's the same concept as those TRS "effect
send-receive" cables commonly used with Mackie CR-1604 inserts.  No active
circuitry involved whatsoever for this.  Pedal used was an RFX-402 Volume
pedal.  The pedal action itself is a piece of feces for ANY application, but
with a little practicing, usable -those who have used this pedal know of
what I say...not complaining, though -didn't have to spend any of the little
dinero I have left!!

-R

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of harry
Sent: Friday, March 22, 2002 10:00 PM
To: Joe Kramer
Cc: Synth-Diy
Subject: Re: [sdiy] CV pedal for Filter Factory


Well FUNNY about this but I just resurrected my 20 year old CV
Pedal made from an old CryBaby.  I used a single NPN Transistor as a voltage

follower so that the output would be reasonably independant of the load.

You could also use a higher value pot that way... and maybe extend battery
life as well.

No need to though... a simple pot will be OK as well....

H^) harry

Joe Kramer wrote:

> Hi Folks,
>     How do I make a simple CV circuit for use in a footpedal?  Do I need
> some kind of active circuitry, like a buffer amp, or can I get away with
> just a pot and a voltage source?  I've already got an empty footpedal
> shell and would like to run the whole thing off a 9V battery if
> possible.  The Filter Factory has a CV input for the filter frequency,
> and gives no specs other than that it's 1V/oct.  Thanks.
>
> Regards,
> Joe Kramer

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