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how can i set speeds with a potentiometer? Answered

Hi there, Im busy building a metronome to fit a machine im altering, (the board was totally fried and rusted through)  which also has a 6volt motor that spins in the front. I managed to find a potentiometer to control the speed of the motor and the metronome, but need to have set speeds on both of them. Is there anything that i can adapt to the potentiometers like a ratchet type system ? something maybe similar to a rotary switch that u click up and down? Im pretty new to all this, any help would be greatly appreciated. MGF

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iceng

Best Answer 6 years ago

Just get a rotary switch.
If you get a 2Pole 11Throw switch,
you can make an 11 position or less stop pot
using the fixed resistors for your desired speeds.
Or a single pole (lower cost ) more complex resistor math.  .  .  A

1PolesetPot.bmp4P11Tsws.jpgStackGangSW.pngresistorsetPot.bmp
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steveastrouk

6 years ago

A pot is a lousy way to directly control the speed of a DC motor. MUCH better to use an adjustable voltage regulator.

Steve

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steveastroukgrenadier

Answer 6 years ago

Actually, not necessarily, particularly at very low speeds. Linear supplies are usually better then.

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canucksgirl

6 years ago

If you google "set speeds with potentiometer" the first link is to a pdf document that might be what you're looking for. I didn't read through the whole document, but there is detailed discussion on how to calculate and set the variable speed.