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    Here is one basic circuit of a simple but accurate 1Hz timebase generator built around a standard Quartz clock circuit board. Just lift the clock PCB from any cheap quartz clock and carefully remove all extra components like the drive coil, buzzer, alarm switch and clock mechanism (quartz movement), etc.

    Next wire the circuit as shown in the schematic diagram, observing correct connection points and polarities, and power it from a 5VDC supply. Precision 1Hz clock signal generator is now ready to serve you. With suitable modification(s) at the output you can use this circuit to drive blinkers, beepers and microcontroller based ciruits.


    • 1. Stable 1.5-1.6 VDC supply for the clock PCB is derived from the 5VDC input supply with the help of componets R1, D1 and C1. Only use a 10mm Red color (Vf=1.6V) LED for D3.
    • 2. Drive coil outputs (L1&L2) of the clock PCB are joined together to get one second pulse output with the help of two schottky diodes (D1&D2). Such low-drop diodes are crucial for this circuit.
    • 3. The circuit is inverting output type and hence, the output is normally at high level,and pulses low once a second.By adding a second (optional) transistor, this can be reversed, ie non inverting, so that the output is normally at low level, and pulses high once a second.

    Quartz 1Hz Timebase Generator Circuit Schematic

    quartz 1hz timebase generator circuit schematic

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    5 Responses to "Quartz 1Hz Generator"

    1. Why the need of SL100 ?

    2. SL100 is not a crucial component.Any low-power npn type can be used.I’ve tested my prototype with a number of general purpose npn transistors.Thanks for your comment.

    3. mujawar Abrar says: on March 5, 2011 at 5:27 pm

      It is a very interesting part of electronics engg.department

    4. Redundant watch recycle

    5. Domagoj Jamičić, Croatia says: on October 21, 2014 at 5:25 pm

      I made a “Quartz 1 Hz Time Base Generator Circuit Schematic” according to the instructions from this site and now I am interested in schemes to “adding a second (optional) transistor, this can be reversed.” The first transistor, which I used is “BC107”. Can I use it in another place? So he prayed to the scheme in order to add this transistor.
      thank you,

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