[sdiy] OB-X VCF mods for BP and HP outputs

[Neil Johnson]

John,

Both filters are pretty much the same: the SEM uses discrete JFETs to
buffer the outputs of the integrators, while the OBX uses TL082 FET-input
op-amps.

In both cases you want to tap off at the *output* of the buffers.  On the
OBX this would be A11 pins 1 and 7.

HTH,
Neil

--
Neil Johnson :: Computer Laboratory :: University of Cambridge ::
http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
----  IEE Cambridge Branch: http://www.iee-cambridge.org.uk  ----