Thrifty 2Hz Clock

Posted on Feb 5, 2014

CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often require quite a bit of current. We therefore propose this oscillator circuit that has a very low current consumption (about 3 µA). The circuit is powered from a type LM334Z current source. The cu

Thrifty 2Hz Clock
Click here to download the full size of the above Circuit.

rrent has been set with R4 to about 3 µA. This is sufficient to power IC1 and the oscillator circuit around X1. The oscillator generates, with the aid of a cheap watch crystal and a few surrounding parts, a signal that is subsequently applied to the divider in the 4060 and results in a frequency of 2 Hz at pin 3 (output Q13). The level of the output pulses is a lot lower than the nominal 5-V power supply voltage (IC1 is after all powered from a current source with very low current). That is why the signal on pin 3 of IC1 is amplified and inverted by T1. IC3a finally turns it into a proper square wave with acceptably steep edges.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Buffer Lc Data And Clock Lines Circuit
    Logic Probe With Sound
    Wingfoot 813 Circuit Description and Schematic Diagram
    White Led driver circuit diagram using LM3404
    CS51227 by the output of 28V 5A DC power supply circuit
    A circuit diagram of a danger zone warning device
    Milliammeter table circuit composed of resistance
    Wireless microphone circuit diagram consisting of transistors 9018