PWM and power control circuit diagrams

Brightness Control for small Lamps

Switch-mode driven 1.5V bulbs. Portable unit - 3V battery supply

Motor Reversing Circuit

the motor cannot be switched from forward to reverse unless the stop switch is pressed first.

Constant Motor Speed Control

A simple op-amp feedback circuit designed to regulate the speed of a DC motor.

DC Motor Control

Control of the movement of the motor, and an indication of direction provided by LED's.

PWM Motor Control

This is a circuit to control motor speed uses pulse width modulation (PWM). The PWM signal is generated by the ubiquitous 555 timer and output current amplified by a power transistor.

Fan Controller

This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you're all set. The above circuit diagram is for a small 12 volt fan, the size and type determined by the user.

Magnetic-Radiation Remote-Control

Short-range 35KHz operation, single-channel units. Simple circuitry, no outer antennas required

Triac Based Light Controller

This project is intended for controlling mains powered disco lighting, although there are many other possible uses for controlling almost any mains appliance. It will control five seperate channels at up to 3 Amp per channel. This could be increased by designing another PCB with wider tracks than the PCB included with this design. I could have used relays to control my lights, but triacs seemed like a more sensible solution as they react quicker and are totally silent as they contain no mechanical parts.