You are the winner! : )
So I got a quote on the pots, and they should be $1.75 or so each if
anyone's interested.
Scott Deyo
The Bridechamber
contact@...http://www.bridechamber.comJealous Edison Record Kompany
http://www.jealousedison.com On Jul 9, 2008, at 1:24 PM, Mark wrote:
>
> How about one op-amp and 3 resistors?? The input goes to a 100K
> resistor (R1) and one end of a 100K pot. The output of the op-amp is
> connected to the the other end of the pot and another 100K resistor
> (R2). The other end of R2 is coonected to the inverting input of the
> amp and the other end of R1. The non-inverting input of the op-amp
> is connect to ground. The input of the next next stage (the output
> of your reversing attenuator) is connected to the wiper of the pot
> with a 49.9K resistor (R3). Do I win?? :)
>
> If the pot has a centertap to ground, it would need to be connected
> with small resistor. You could build it on a MUUB or CGS
> mixer/inverter PCB.
>
> On 7/9/08, Scott Deyo put forth:
> >
> >The SEM VCF uses just one op-amp and four resistors, the pot having
> >the CV straight to one side of the pot, the inverted CV to the
> >other. Maybe a buffer on the output would be good, but that's still
> >pretty darn tiny. NanoPolarizer?
> >Doesn't Peter Grenader's Gizmotron do that, though?
> >Are those still available?
>
>