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Tuesday, April 9, 2013

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.

Circuit diagram:
mains-frequency-monitor-circuit diagram
Mains Frequency Monitor Circuit Diagram


Source by : Streampowers

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