1. To study that the output of the 555 timer is connected through the High power Triac based opto isolator triggers the Triac which in turn controls the speed of the motor
2. Speed of the motor depends upon the frequency of the 555 Astable Multivibrator output.

FEATURES :

1. 230V AC mains
2. +12V/500mA
3. HP AC Motor (not supplied)
4. 4. Tacho meter (not supplied)