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Fri Jan 7 20:12:36 EST 2011
BJT current controlled resistor
Some early Korg synths and also the recent Monotron[1] (follow links
for Monotron schematic) have a Sallen-Key filter with current
controlled resistors implemented by BJTs. Might be a good alternative
to FETs, which have large V_T spread so might need more calibration.
It seems that the problem is that these are all used as AC / small
signal resistors, and rely on the large base current to flow.
[1] http://www.timstinchcombe.co.uk/synth/korg.html
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