Time based clock generator using crystal for digital


This is a clock generator that high accuracy, in square ware as time base for various digital circuits, by MM5369,CD4017 and crystal. Which output are 60Hz,1Hz and 1/60Hz.

How this circuit works

As circuit is shown in Figure 1 The output frequencies have feature for 60 Hertz, 1 Hertz and 1/60 Hertz. Which convenient for use in the circuit about time base such as : the digital counter, timer, digital clock etc. As heart in working are MM5369AA to generated clock frequency(standard digital clock) 60 Hz. so there is a the Crystal frequency 3.579 MHz. is determined fixed value. thus the output so correctly.

Time based clock generator using crystal

Figure 1 The circuit of Time based clock generator using CMOS IC MM5369AA

The output signal 60 Hz at pin 1 of IC1 can use immediately. Especially apply to the general digital clock circuit.
When need the lower than this frequency output. We will must enter the signal to the frequency divider circuit (IC2 to IC5 are CD4017) before
The output from pin 11 of IC3 will has frequencies is 1Hz.
The output from pin 11 of IC5 will has frequencies 1/60 Hz (1 cycle per minute )

How to builds this projects

All components as this circuit can assemble into PCB as is shown in Figure 2 And we design the power supply and DC regulated 12 volts within this PCB mixed perfectly. so conveniently to applied.

Pcb of time based clock generator

Figure 2 The single-sided PCB layout and the Component layout for the PCB

When assemble finished to experiment to supply into the circuit. in order that we can use AC voltage from 12V to 18V of the center trap transformer, Input directly to diode D1, D2.

Then well get to the clock signal that has amplitude about 12 volts as you want

The components List
IC1________________MM5369AA
IC2, IC3, IC4, IC5_____CD4017
IC6________________LM7812___DC regulated 12V-IC
D1, D2_____________1N4001___50V 1A Diodes
R1________________1K___1/4W 1% resistors
R2________________10M X2__1/4W 1% resistors
C1________________TRIMMER capacitor 22pF

Polyester Capacitor
C2________________47pF
C5________________0.1uF 50V
C6, C7, C8__________0.01uF 50V

Electrolytic Capacitors
C3________________470uF 25V
C4________________470uF 16V


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