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My son has built a model of a fairground ride for a school project. He used a small electric motor powered by a 4.5 V battery to drive it but he said he wanted a speed control for it. So I fitted a potentiometer in series with the motor. Unfortunately, the potentiometer was 1 kOhm and the working range for the motor to run was tiny (~0 to 5 Ohm) so it was virtually a switch. Also, the potentiometer burnt out after a while.
Any advice please on this? Do I just need a potentiometer with a lower resistance but with a higher power rating? Is it possible to get such a thing?
No best answer has yet been selected by DavidUK. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I don't think this is the proper way to plug a potentiometer... if it has 3 connectors
When I was at school we used them that way:
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/info/com p/passive/resistor/pots/pots.htm
try this
http://img222.echo.cx/img222/5053/mot5hm.jpg
the value of R should be battery volts/max amps that go thru the base of tr is u use the mA value u will get the value straight in Kohms. for the value of the pot make that 1 tenth of R and make sure the TR can carry the current required by the motor that can even be an amp or more so a heat sink is probably needed.
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