This is a design circuit for a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed. This is the figure of the circuit;
The circuit consists of two astable multi vibrators. One multi vibrator is formed by transistors T1 and T2 while the other astable multi vibrator is formed by T3 and T4. Duty cycle of each multi vibrator can be varied by changing RC time constant. This can be done through potentiometers VR1 and VR2 to produce different dancing pattern of LEDs. Total cost of this circuit is of the order of Rs 30 only. Potentiometers can be replaced by light dependent resistors so that dancing of LEDs will depend upon the surrounding light intensity.
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