[sdiy] voltage-controlled AM radio tuning

[Dave Manley]

Cary Roberts wrote:
>> But if you are happy with a slower response, the coolest thing would be a
>> voltage controlled motor doing the tuning. Using a small motor driving a
>>     
> pot
>   
>> and the tuning shaft, and using the pot as a position sensor for a feedback
>> controlled positioning circuit, you could wannder back and foward at will
>> using CV.
>>     
>
> That's actually a pretty good idea.  Servos are PWM controlled.  50hz with a
> pulse width of .5ms to 2.5ms (1% to 5%) for most servos.  This would be
> pretty easy to implement with a 555 timer and comparator.
>   
Or, take an old car radio with push button station selects, and put a 
row of solenoids in front...nothing like a bunch of solenoids going 
thunk, thunk, thunk

-Dave