> In the "programmable load" situation, a 1 ohm resistor could be
> made to look like anything between 1 ohm and infinity by varying
> the duty cycle of when the resistor is in circuit

A synthesiser I built many years ago used that technique in the
voltage controlled section (filters, amps etc). No high current of
course, CMOS, with 4066 / 4416 gates as the switched FETs

Joe
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