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Old 7th Dec 2017, 4:20 pm   #10
Nymrod121
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Join Date: Apr 2012
Location: Worcestershire, UK.
Posts: 1,153
Default Re: Using a gromet as a gear !

Brilliant!

The BBC Audio Test Set EP14/1 in all variants has a similar arrangement for the frequency set control. A (flywheel-equipped) spindle has a rubber grommet that presses against the surface of an aluminium disc connected to the Wien Bridge oscillator's air-spaced capacitor. It serves as a 'mitre box' * and reduction gear combined.

Guy




* (any bus enthusiasts out there will know this is a 'Bristol VRT transmission' term )
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Last edited by Nymrod121; 7th Dec 2017 at 4:24 pm. Reason: ref update
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