This is a design circuit in which the status of the output pins of a Flip Flop IC can be toggled by using sound. This circuit is based on LM324 IC. This is the figure of the circuit.
Processing operation of the circuit is a condenser microphone is used for picking up the sound. The first two op amp is in the IC1 LM324 is used to amplify the sound picked by the condenser microphone. The third op amp inside LM324 is wired as a level detector. When ever the voltage produced due to sound have a level more than that of the reference voltage at pin 5 of the third op amp, its output (pin 7) goes high, triggering the flip flop IC1 CD 4027.
As a result the state of the output pins of CD 4027 (pin 1 & pin 2) toggles for each burst of sound. The circuit can be powered from 4, 5 V DC. The mic M1 is a condenser mic. All capacitors must be rated 10V. The sensitivity of the circuit can be adjusted by varying the preset R9.
Processing operation of the circuit is a condenser microphone is used for picking up the sound. The first two op amp is in the IC1 LM324 is used to amplify the sound picked by the condenser microphone. The third op amp inside LM324 is wired as a level detector. When ever the voltage produced due to sound have a level more than that of the reference voltage at pin 5 of the third op amp, its output (pin 7) goes high, triggering the flip flop IC1 CD 4027.
As a result the state of the output pins of CD 4027 (pin 1 & pin 2) toggles for each burst of sound. The circuit can be powered from 4, 5 V DC. The mic M1 is a condenser mic. All capacitors must be rated 10V. The sensitivity of the circuit can be adjusted by varying the preset R9.
