C32 (Rev. 5) User Manual
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User’s Manual Page 16
Replacing a Potentiometer:
This circuit can be used to replace a potentiometer of a DC
motor speed control circuits. This speed controller circuits are
very commonly used by SIEG, KB Electronics, and many other
Asian machines. Before explaining how to do it, please first
keep in mind that it can be done if the voltage that goes though
the pot is +12vdc or less. This circuit cannot be used for AC
currents.
In most cases the terminals that go to the potentiometer will
carry these signals:
P1 = GND
P2 = WIPER
P3 = REFERENCE VOLTAGE
These are the steps for replacing a potentiometer:
Measure the voltage difference between P1 and P3. Make sure it measures
under +12vdc.
Fine tune the analog output to the output voltage you got from step 1.
Connect the ground from the analog output to the ground of the potentiometer (P1).
Connect the analog output to the wiper connection of the potentiometer (P2).
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