-=> Jasen Betts said to Greg Mayman
 -=> about "*BIG* TRANSISTORS" on 02-14-04  10:47.....

 JB> immagine trying to control it with a remote.... the delay in response
 JB> cpould be annoying... otoh if the remote had fast and slow buttons it
 JB> could have worked...

I guess a motor with heavy braking could do it.

You could have autosearch with a phase detector on the unit to
detect "lock in" on a station. In fact a reversable motor would
be ideal for that.

Or you could have the tuning linked to a pot feeding one input of
a comparator with a bank of preset pots set for whatever stations
you wanted. The motor would drive the tuning gang until the
output of the pot matched the voltage from the presets.

Yes, there are many possibilities.

But the more I think about it, the more it seems that varactor
diodes and electronic tuning can do it much more easily 

I once designed a circuit for an electronic tacho using a single
LM3900 to drive a motor connected to a potentiometer. The pot was
for feedback and the shaft was to have a pointer to give me a 270
degree dial for the readout.

I got the electronics working well, using a dummy load with a
centre-zero meter, and myself to control the feedback pot, but I
never built up the mechanical side of it. It should have worked
well.

   ,-./\
  /     \ From Greg Mayman, in beautiful Adelaide, South Australia
  \_,-*_/    "Queen City of The South"    34:55 S  138:36 E
       v

... Stop searching forever.  Happiness is just next to you.
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