i wish to find this type of product

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banh

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simple. i need a DC motor that can change speed (via a POT??). it should have something similar to rotary encoder that returns the square wave whose frequency varies with the motor speed.

instead of making one, which involves the troublesome of mechanical precision, i wish to buy sth similar.

anyone has any suggestion?
 

I have built some devices exactly as you describe for some projects of my own. If you become interested in building one, I'll help you through it, just PM me.

If you're interested in buying one, there are plenty on the web, even kits like at https://www.electronickits.com.
 

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