开云体育

You will need a way to convert pulses from the encoder into frequency
changes. You will have to determine, probably by experiment, how large
the frequency change needs to be for each pulse. A further
complication is that the function is probably not a constant. The
original tuning capacitor is not linear, and they cope with that by
adjusting the marking of the tuning scale accordingly. But that could
be dealt with in software if it turns out to be necessary. (I don't
know how non-linear the HW-7's tuning is.)

Another problem is that if you tune past the point where the physical
dial stops changing, the encoder will still generate pulses but the
tuning indication won't change. That will cause the synthesizer
software and the needle to get out of sync with each other. You could
deal with that by having a calibrate function; you tune to, say, 7.050
and then push a button that moves the synthesizer to that frequency.
Or you could get fancier by installing a few microswitches that would
be activated by the tuning needle and adjust the synthesizer when they
turn on.

Sounds like an interesting project. Though it's certain to horrify any
preservationist purists who are reading.