The kit Adjustable Dancing Light can be used anywhere in party time You might have come across several types of adjustable dancing lights (flickering LEDs). Most of them use presets (variable resistors) to adjust the rate of switching. Being a mechanical component, the preset easily wears out with use and also introduces noise in the circuit. The circuit presented here selects different values of resistors to control the frequency of an astable multivibrator using timer IC 555.
The objective of the kit Adjustable Dancing Light is to design a circuit which consist decade counter IC 4017, quad bilateral switch IC 4066 and timer 555. The decade counter IC 4017 output selects one of the resistors at the output of IC 4066. The selected resistor changes the time period of the 555 timer circuit, which’s ‘on’ and ‘off’ timings. We can change ton and toff time by changing the value of resistors and capacitors connected to the corresponding circuit.