120 VAC Lamp Dimmer


Posted on Feb 6, 2014

The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small signal transistors are connected in a switch configuration so that when the voltage on the 2.2uF capacitor reaches about 8 volts, the transistors will switch on and discharge the capacitor through the SCR gate causing it to begin conducting


120 VAC Lamp Dimmer
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

5V regulated power supply
Telephone Line Simulator Schematic
Electronic balanced input microphone amplifier
Sensitive rf voltmeter
Mains Powered White LED Lamp
High-speed control scheme LED display screen circuit diagram and principle
Electric strike with Arduino circuitry
mains voltage monitor
metal detector circuit
Ding-Dong sound generator
Fred Nachbaurs Theremax modifications
12V Flourescent Lamp Inverter
ICL8038-based Oscillator
INA331 332 configured to directly drive the capacitive input A D converter circuit
Thyristor controlled motor reversing circuit a timer



Top