This is the 60Hz Standard Frequency of the calibration frequency standards for the digital clock circuit. calibration for any the digital clock. It is a 50Hz or 60Hz frequency pulse generator circuit, with a test point(TP) of 3.579MHz.
It uses MM5369 – 8 pins as the main part, easy use with 12V power supply. In normal using, the output pin 1 gives a frequency of 60Hz
Why use 60Hz standard Frequency
When you have finished building your digital clock circuit kits, with any ICs number.
Some circuits use standard frequency signals of AC power line 60Hz (North America the power line frequency is 60 cycles per second or 60 Hertz).
It is a sine wave and then converted to Pulse Generator circuit become to the square waveform of 60 Hz.
But when we need to use it in the car or other DC power supply.
How to it still work well?
Or You need to use the 60 Hz standard frequency for many digital counter circuit.
We so built the circuit of the pulse generator of 60Hz. To replace the old ways. You may also be adapted to a backup set. When the power goes out. We do not have to waste time re-scheduling.
Recommended: ECG simulator circuit using CD4521 and CD4017
Meet High Precision 60Hz Generator MM5369
Cr: Photo ElectronicStorm
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It is a CMOS IC with 17 binary divider stages. We can used to generate a precise reference. By using commonly available high-frequency quartz crystals.
The MM5369 is available for an 8-lead dual-in-line 8 DIP (same 555 timers) epoxy package.
An internal pulse is generated by mask programming the combinations of stages 1 through 4 16 and 17 to set or reset the individual stages.
See MM5369 pinout.
How it works
In the working heart of this circuit is the crystal oscillator has a frequency of 3.579 MHz and MM5369AA-IC only as of the circuit shown in figure first.
The signal output of this circuit will have 2 frequencies
- 60Hz applied to your job
- 3.579 MHz to adjust the C2 trimmer at the frequency to work properly.
The detail of parts
X-Tal: 3.579 MHz
R1: 20M, 0.25W Resistor 1%
R2: 1K, 0.25W Resistor 1%
C1: 47pF 50V, Ceramic capacitor
C2: Trimmer 5-15pF
How to build
To place all parts as a circuit diagram into PCB as shown in Figure 2. And then adjust C2 still output pin 7 is equal to 3.579000MHz.
If you do not have the frequency 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
However, If you think that this circuit is not good enough for you.
You can see the crystal circuit is as follows:
- 5 Crystal oscillator Circuits using Digital ICs example 1Hz standard digital clock, Pulse generator 32.768kHz using a watch crystal.
- Transistor crystal oscillator circuits: example: Oscillator astable multi-vibrator with Crystal controller
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