1Hz Generator

Posted: June 27, 2010 in Digital Electronics, Tutorials
Tags: , ,

When doing a project that needs a 1Hz clock source, we usually use  LM555 configured as astable mode as a clock source. The circuit above is an alternative 1Hz source.  Since we are using 60Hz in the Philippines, the circuit is designed to divide the frequency to 1Hz.

The input is connected to the secondary of the transformer of the power supply section of the project. The zener diode clamps the voltage to 5V since we are using TTL glue logic. The CD4022 divides the clock input of 60Hz to 10Hz, its output is then connected to a decade counter which further divides the 10Hz to 1Hz thus providing a clock source to your glue logic digital clock project or anything that needs a 1Hz source. The circuit can be used with countries using 50Hz by changing the connection to CD4022’s Q6 transferred to Q5. Credit to Redskin of elab

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