Stroboscopic
lighting effects for discotheques are achieved by using conventional white LEDs
replacing the discharge lamps for higher efficiency at low cost. This control
is possible by instantly switching the LEDs on & off at higher voltages for
less time period. This fast control of intensity from full glow to full off helps
in developing a stroboscopic effect which is generally used in disco dance
floors for better effects.
A programmable
microcontroller from 8051 family is engaged to provide such effect being driven
by a MOSFET for cluster of LEDs. The controller according to the program
generates ON/OFF commands at high rate thus giving the effect of stroboscopic
lights. As the controller gives only 5v drive, it is not possible for the
MOSFET to be reliably switched ON at that voltage. An interfacing transistor is
used between the controller output and the MOSFET for driving the same.
The power supply
consists of a step down transformer 230/12V, which steps down the voltage to
12V AC. This is converted to DC using a Bridge rectifier. The ripples are
removed using a capacitive filter and it is then regulated to +5V using a
voltage regulator 7805 which is required for the operation of the
microcontroller and other components.
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