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Here is 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.
The circuit consists of two astable multivibrators. One
multivibrator is formed by transistors T1 and T2 while the other
astable multivibrator is formed by T3 and T4. Duty cycle of each
multivibrator 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. The colour LEDs may be arranged as
shown in the Figure
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