The current limit circuit (see diagram) compares this voltage to an adjustable negative voltage using an op-amp wired as a comparator – unlike many op-amps, LM324 op-amps can be used as comparators ...

Reverse engineering a ‘DC-51’ motor controller I have been trying to fix a little old milling machine I bought (and here), and needed a replacement motor controller. It is a Clarke DCM10, a variant of ...

What you’ll learn: Why there’s a continuing role for brushed DC motors. The multitude of small-motor applications for autos. How motor drivers can enhance performance and connectivity.