Light dimmer and power controller schematics

Electronics Infoline Web

An AC Dimmer for Use with the Stamp

The basic idea of the circuit is to replace the variable resistor that is connected to the knob of a dimmer with an optoisolater. The optoisolator is connected to an operational amplifier that interfaces with the stamp.

http://www.cs.cmu.edu/~RAS/Docs/space/dimmer.html

Power Control : Basic Lamp Dimmer

Lamp dimmers using traics can be quite simple, nothing more than a potentiometer, resistor, capacitor and triac with a built-in diac.The circuit below is similar to designs using unijunction transistors to generate the triggering pulse.

http://www.techlib.com/electronics/power_control.htm

PWM Motor Speed Controller or DC Light Dimmer

A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit may be used in either 12 or 24 Volt systems with only a few minor wiring changes.

http://www.solorb.com/elect/solarcirc/pwm1/

1200 Watt Lamp Dimmer

The following circuit is a lamp dimmer circuit that is capable of controlling up to 1200 Watts. The circuit uses the Q4015LT combination Diac and Triac.

http://home.cogeco.ca/~rpaisley4/x1200WControl.html

Automatic 12 Volt Lamp Fader

This circuit is used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss.

http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm#eyes2.gif