Mains Frequency Monitor

Here is a simple
frequency counter designed to monitor the 240VAC mains supply. It as a
frequency range of 0-999Hz, so it could also be used with 400Hz
equipment. Standard TTL/CMOS logic is employed
for the counters and display drivers, while an ELM446 (IC1) generates
accurate 1Hz pulses for gating. This device utilizes a 3.579545MHz
crystal for its timebase, as commonly found in TV and video circuits and
even on old PC motherboards.

Mains Frequency Monitor Circuit

Mains Frequency Monitor Circuit Diagram

Copyright: Silicon Chip Electronics Magazine

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