50 Hz 60 Hz frequency generator circuit using crystal oscillator

You can generate 50Hz or 60Hz using this frequency generator. This oscillator can be used as the front end of circuits that require precision pulses.

A crystal is used in the circuit to generate clock pulses. The circuit uses two counter ICs CD4060 and 7490 to divide the basic frequency to generate 50Hz or 60Hz pulses.

PARTS LIST R1 2.2MΩ C1 24pF C2 24pF C3 0.01µF C4 47µF 16V C5 0.1µF C6 100µF 16V XTAL 4.096MHz or 4.9152MHz Crystal IC1 CD4060 IC2 7490 (SN74LS90N) IC3 7805 Regulator “X” is a test point.

CD4060 act as an oscillator and frequency divider here this is arranged to divide by 8192Hz which gives 600hz when you using 4.9152MHz crystal or 500hz when you using 4.096MHz crystal. That frequency further divided by 10 using 7490 IC is to obtain 50Hz or 60Hz output.

4.096MHz Crystal

4.096MHz=4096Khz=4096000Hz

4096000/8192=500Hz

500/10=50Hz

4.9152MHz Crystal

4.9152MHz=4915.2KHz=4915200Hz

4915200/8192=600Hz

600/10=60Hz

You can check CD4060 crystal oscillator and frequency divider work correctly via “X” test point. when you use 4.096MHz crystal “X” point gives 500Mhz output and 4.9152MHz crystal gives 600Hz output. If you don’t need a test point you can ignore it.

This frequency generator circuit gives 50Hz as output when the crystal is 4.096MHz. Crystal must be 4.9152MHz if you need 60Hz.

UPDATE: (09/08/2018)

Please use below circuit, If circuit fail to oscillate.

Supply voltage is between 7.5v to 15v for above circuit.

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