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Dancing LED Circuit

This circuit uses two astable multivibrators formed by transistors to create a dancing or flashing pattern with LEDs. The duty cycle and timing of each multivibrator can be adjusted using potentiometers to vary the RC time constant, allowing different dancing patterns to be produced. The inexpensive circuit costs around 30 rupees and light dependent resistors could be used instead of potentiometers so the LEDs dance based on ambient light levels.

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Akshay Bhande
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113 views1 page

Dancing LED Circuit

This circuit uses two astable multivibrators formed by transistors to create a dancing or flashing pattern with LEDs. The duty cycle and timing of each multivibrator can be adjusted using potentiometers to vary the RC time constant, allowing different dancing patterns to be produced. The inexpensive circuit costs around 30 rupees and light dependent resistors could be used instead of potentiometers so the LEDs dance based on ambient light levels.

Uploaded by

Akshay Bhande
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Dancing LED Circuit

Posted by Sandeep Yadav in Sunday, February 27, 2011


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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