Description
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.
Circuit diagram:
Mains Frequency Monitor Circuit Diagram
: Silicon Chip Electronics Magazine
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