| The controller was designed to stabilize the speed of small d.c. motors within certain limits. It holds constant the counter-e.m.f. prod...
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| Voltage-operated switches are fairly common place. but frequency-operated ones are still rare. The once described here is based on a 4046...
| Pulse width modulation (PWM) is Ideal for controlling small electric PCB drills that draw currents of up to 2 A. Larger currents are poss...
| The most remarkable feature of this small stereo amplifier is the use of a stepper motor bridge driver IC as a stereo power output stage....
| The regulator shown in the diagram enables the speed of a DC motor to be set over a wide range. Although the most frequently used method f...
| Inductive proximity switches are used, for instance, for measuring motor speeds or determining the position of metal objects. They da not...
| Although most petrol-engined cars and lorries have a rev counter as standard, that is by no means the case in diesel-engined motor vehicl...
| SmalI, compact motors as used in circle saws, lawn mowers and other small electric tools burn out when overloaded. Before that happens, it...
| In many older cars the windscreen wash pump is not coupled to the windscreen wipe function. This circuit switches on the wiper motor for...
| In this second and final instalment of the article we discuss the power driver board that sits between the PC interface described last...