Here is a simple frequency counter designed to monitor the 240VAC primarys provide. It as a frequency range of 0-999Hz, so it may be used with 400Hz equipment. Standard TTL/CMOS common sense is employed for the counters and display drivers, whereas an ELM446 (IC1) generates accurate 1Hz pulses for gating. This instrument make the most ofs a 3.579545MHz crystal for its timebase, as usually found in TV and video circuits and even on previous PC motherboards.
Mains Frequency Monitor Circuit Diagram
Copyright: Silicon Chip Electronics Magazine
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