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messer · Senior Joined: 08 Mar 2012 Posts: 2059 Location: Europe

Speed Controller Using a Triac

This speed controller is controlled by the voltage levels which receives at its gate TRIAC through potentiometer VR1, against this background, we can control the speed of fans, drills, and other power tools that do not exceed the amperage of the triac.

This is obtained by controlling the electrical power supply for lighting resistive circuits and can also be used to regulate the small universal type motors, or using coals (blades), for example, holes (bores) , jigsaws, fans, etc..
Can also be successfully used to regulate sewing machine motors, plastic injectors...
This circuit has a hysteresis correction network and one for eliminating high voltage transients. T
he first is formed by R1, R2 and C1, the second by R4 and C3.

The hysteresis of triacs is a very noticeable feature, because the holding current is significantly less than the current required for starting.

List of components

Capacitors:
C1, C2, C3: 0.1 uF. Ceramic 200 volts
Transistors:
TRIAC1: For 10 A. 400 V.
Resistors:
R1, R2: 47K
R3: 100K (potentiometer)
R4: 100 ohms
Speed Controller Using a Triac Speed Controller Using a Triac

Speed Controller Using a Triac Speed Controller Using a Triac