This circuit turns on the output (LED and buzzer) for a short duration after a preset time interval of 10 to 90 seconds in steps of 10. Without the clock signal, this circuit can also be called a square wave frequency divider of divide by 10 to 90.
Circuit diagram:-
Main components required:-
- Crystal oscillator circuit removed from wrist watch's machine or wall clock's machine.
- 1.5V battery for crystal oscillator circuit.
- Transistor BC547 - 2pcs.
- Dual timmer IC 556.
- Decade counter IC4017 - 2pcs.
- Capacitors, resistors, led, 5V piezo buzzer.
- Microswitch.
Why make this circuit?
- Precise clock pulses of 1sec because of crystal oscillator which oscillates at a frequency of 32,768 times/second. If you want to know, how to use a crystal oscillator from wrist watch then watch this video on my YT channel- https://youtu.be/kxRkMNUYzdg
- Set time interval from 10 to 90 seconds by input switches. No need of using RC network for time setting. Frequency is divided by cascading two 4017IC (decade counter)
- No need to buy relatively expensive microcontrollers to provide precise timing pulses.
Applications:-
- In Factories and industries where timing signals are required to drive an electrical valve, motor, relays, etc.
- Timing signals for an indication for eg- blinking tail light, workout timmer,
- Measuring pulse rate. beats per minute (bpm)
- Measuring RPM of the motor.
Working demo video:- https://youtu.be/UKywmi5A__U
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