This AC motor speed controller can handle most universal type (brushed) AC motors and other loads up to about 250W. It works in much the same was a light dimmer circuit, by chopping part of the AC waveform off to effectively control voltage. Because of this functionality, the circuit will work for a wide variety of loads including incandescent light bulbs, heating elements, brushed AC motors and some transformers.
The circuit tries to maintain a constant motor speed regardless of load so it is also ideal for power tools. Note that the circuit can only control brushed AC motors. Inductive motors require a variable frequency controlPart Total Qty. Description Substitutions
R1 1 27K 1W Resistor
R2 1 10K 1/4W Resistor
R3 1 100K 1/4W Resistor
R4 1 33K 1/4W Resistor
R5 1 2.2K 1/4W Resistor
R6 1 1K 1/4W Resistor
R7 1 60K Ohm 1/4W Resistor
R8 1 3K Linear Taper Trim Pot
R9 1 5K Linear Taper Pot
R10 1 4.7K Linear Taper Trim Pot
R11 1 3.3K 1/4W Resistor
R12 1 100 Ohm 1/4W Resistor
R13 1 47 Ohm 1W Resistor
C1, C3 2 0.1uF Ceramic Disc Capacitor
C2 1 100uF 50V Electrolytic Capacitor
D1 1 6V Zener Diode
Q1 1 2N2222 NPN Transistor 2N3904
SCR1 1 ECG5400
TR1 1 TRIAC
U1 1 DIAC Opto-Isolator
BR1, BR2 2 5A 50V Bridge Rectifier
T1 1 Transformer
MISC 1 PC Board, Case, Line Cord, Socket For U1, Heatsinks
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