On Tue, 09 Nov 2010 09:12:34 -0700, Jim Thompson
wrote:

On Tue, 09 Nov 2010 09:41:50 -0600, John Fields
wrote:

Combined filter/coil driver functions and used a spare opamp to get
the Q3 inversion to feed back to D1.

I used LT1677's 'cause they were in the LTspice database, and handy,
but there are probably other parts out there that would work as well,
for less money.

---
JF

John, Why does the lower left corner of your D-Flop symbol show as an
unconnected pin?

...Jim Thompson

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Look in the help under "A. Special functions".

It only mentions it in context with the gates, but it probably applies
to the dflop as well. Helmut will know, for sure.

---
JF