This is 60Hz calibration frequency standards for digital clock by MM5369. It is a 50hz or 60hz frequency generator circuit in Pulse Generator and TP 3.579MHZ. It use IC MM5369 – 8Pin easy use. power supply 12V.Out put Frequency 60HZ Pulse Generator. (PIN 1)

This is calibration frequency standards for digital clock circuit.

When you have finished building your digital clock circuit kits, with any ICs number. But how to

which normally we will be get the standard frequency signal of AC power line 60Hz (North America the power line frequency is 60 cycles per second or 60 Hertz) that is a sine wave and then is converted with the Pulse Generator circuit become to square wave form of 60 Hz .

But when we need to use it in the car or others DC power supply. How to it still work well?
We so built the circuit of the pulse generator of 60Hz, to replace the old ways. You may also be adapted to backup set , when the power goes out. We do not have to waste time re-scheduling.

How it works
In working heart of this circuit is the crystal oscillator has frequency of 3.579 MHz and MM5369AA-IC only as circuit shown in figure first.
The signal output of this circuit will be have two frequency are 60 Hz applied to your job and 3.579 MHz to adjust frequency to work properly.

The detail of parts
IC1_____MM5369AA
X-Tal____3.579 MHz
R1______20M____Resistor 1/4W
R2______1K_____ Resistor 1/4W
C1______47pF 50V___ceramic
C2______Trimmer 5-15pF

How to builds.
To place all parts as circuit diagram into PCB as shown in Figure 2 and then fine C2 still output pin 7 is equal to 3.579MHz
If you do not have the freqency meter to test the connection and try to set the clock.
If the frequency is low. The clock is moving slower than usual. And if the clock frequency is brisk walking.

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

Note:

However If you think that this circuit is not good enough for you.
You can see the crystal circuit is as follows:
1. Crystal oscillator circuit

2. Crystal oscillator using TTL

3. 1HZ Standard digital clock

4. 1 MHz time base using ceramic filter 10.7Mhz

5. Pulse Generator Oscillator 32.768KHz by watch crystal

6. Oscillator astable multi-vibrator with Crystal controller

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