[sdiy] Re: Leapfrog

[Ian Fritz]

Right.  As in the differential-integrator VCO I developed many years ago 
and recently resurected.

http://home.earthlink.net/~ijfritz/sy_cir3.htm

   Ian


At 11:36 PM 1/7/2004, Don Tillman wrote:
>    > Date: Thu, 08 Jan 2004 05:32:08 +0100 (CET)
>    > From: Magnus Danielson <cfmd at bredband.net>
>    >
>    > Now I want a one-op-amp integrator having both a positive and
>    > negative input.
>
>Hi Magnus.
>
>You can do that with an opamp, 2 resistors, and 2 capacitors.
>
>(Vin+ to R1, R1 to C1 and opamp+,
>  C1 between opamp+ and ground,
>  Vin- to R2, R2 to opamp-,
>  C2 between opamp- and opampout)
>
>   -- Don