Precision 1Hz clock generator circuit

Precision 1Hz clock generator circuit cd4060 cd4013 32.768 khz crystal

This is 1 Hertz clock generator circuit using 32.768Khz crystal, CD4060 and CD4013 ICs. Our circuit base on crystal oscillator. So we can get very accurate and stable output. That can use for clock, timers and many projects.

Precision 1Hz clock generator circuit schematic 32.768KHz to 1Hz

R1 10MΩ
R2 330KΩ
C1 33pF Ceramic
C2 33pF Ceramic
C3 0.1µF Ceramic
IC1 CD4060
IC2 CD4013
XTAL 32.768KHz

XTAL is 32.768KHz crystal. That is a very commonly use in digital clock.

32.768khz crystal oscillator circuit cd4060

R1 use as bias resistor and R2 use as a current limiting resistor. C1 and C2 are load capacitors.

cd4060 pin configuration pinout ic

Let’s check how we get 1Hz output.

We need to divide our crystal frequency by 215 to get 1Hz.

CD4060 act as an oscillator and frequency divider, here it is arranged to divide by 16384 which gives 2Hz when you using 32.768KHz crystal.


Then we use CD4013 dual D-Type Flip-Flop as a frequency divider. Our circuit use only one D-type flip-flop. It divides our frequency by 2. Now we can get 1Hz output. Other D-type flip flop is not used and it connects to the ground.

CD4013 Dual-D-Type-Flip-Flop-pin-configuration

This circuit accuracy slightly depends on crystal quality and ambient temperature. If you have a high accuracy frequency meter you can slightly adjust frequency by changing C2 capacitor valve. You can use 50pF variable capacitor for C2 to do that. You can connect a frequency counter to CD4060 number 9 pin (External C) and adjust C2 to read exactly 32.786KHz. This is not necessary for our normal projects.

Precision 1Hz clock generator circuit PCB

Precision 1Hz clock generator circuit PCB Layout 1Hz Oscillator Circuit PCB Copper Tracks with Drilling Holes CD4060 1 hertz crystal oscillator pcb Component Side


1Hz Clock Generator Circuit 32.768KHZ to 1Hz CD4060 CD4013 1Hz Oscillator PCB Soldering 1Hz Oscillator PCB Design

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