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What motors do you use to turn potentiometers and air variable capacitors?

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September 15th 03, 09:30 PM

Jack Smith

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On 14 Sep 2003 21:51:38 -0700, (Jason Hsu)
wrote:

Has anyone here used a motor to control a potentiometer or variable
capacitor? (An automatic tuner would be such an application.)

What type of motor do you use? Servo? Stepper? Something else?
What do I need to look for in a motor?

Jason Hsu, AG4DG

The military has historically used small DC gear motors, Pittman,
Globe, etc. Fair Radio has these at reasonable prices. The control
mechanism is all analog, classical servomechanism and error detector
and amplifier approach.

Alpha uses stepper motors to turn the tuning and loading caps in the
auto tune amplifier. These are fair size steppers with gearing.

If your control mechanism is analog, look at DC motors. If you are
going to use digital control, think steppers.

Jack K8ZOA

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