rotary timer swiches

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Zak28

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were to obtain rotary timer switches

were can I obtain those rotary timed switches which shut off after a set duration to which they are turned to? typically, preferably not, they emanate a clicking noise as they elapse closer to shut off. Need low power ~12.5vdc switch.
 
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There are types which are clockwork, you wind up a spring and an escape mechanism ticks as it slowly releases the tension and there are types with a small motor that gradually moves the setting to zero. The place to look is in a domestic appliance supplier as they are still widely used in cookers and microwave ovens.

If you need accurate timing, consider a potentiometer hooked up to the ADC input of a small MCU and use the measurement to set a software timer. You can use another pin to switch the load or drive a relay.

Brian.
 
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Im looking for the clockwork types however I could not find any off reputable retailers.
 

Maybe try:
**broken link removed**
or

Searching for "clockwork timer" seems to work best.

Brian.
 
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