Mains Frequency Monitor

Posted on Feb 5, 2014

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 i

Mains Frequency Monitor
Click here to download the full size of the above Circuit.

ts timebase, as commonly found in TV and video circuits and even on old PC motherboards.

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