A couple of more thoughts....
- Replace the 12 volt supply with a 5 volt
- You can also use inexpensive diodes (1N4000 series) in series to
drop your voltage.
Each diode drop is about .6 volts so you'd need a lot for the 12 volt
supply but only a few with the 5 volt.
- If anyone's going to Dayton in May, there's also a BIG Amateur radio
flea market in town at the same time. If you know someone who's
going ($25 at the door), you can get a pile of IC regulators (as well as
other components) for cheap.
http://www.hamvention.org/
- Don't know what Radio Shack US is like for parts now. RS Canada
basically eliminated parts. If you want any you have to go to their
website.
Ken
> The best solution is a voltage regulating IC to set the voltage at 3
> regardless of load. Radio shack should have them, but it's been a while
> since I've bought any. They should be cheap and able to drive several
> motors.
>
> A cheap way, depending on what one has lying in their parts bin, is
> to use a pair of NiCad batteries to drive the motors, keeping them charged by
> a trickle of current limited by a resistor. Not my first choice, but it will
> work reliably and is easy.
>
> Another cheap, but electrically inefficient way is to use a Zener
> diode to hold the voltage to 3 volts. He could use his 1200 ohm resistor in
> series with and a 3 volt Zener parallel to the motor. Whatever current the
> motor doesn't use will be handled by the Zener. The downside is that the
> resistor will always be dissipating heat regardless of whether the motor is
> running or not.
>
> Bob
>
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