Power Line Frequency Monitor

60 Hz Frequency Calibration


This low cost module measures the short-term accuracy of 60 Hz sources. A bright bargraph indicator displays variations around the ideal frequency.

Circuit Diagram
The circuit is constructed around a single chip microcontroller with a minimum of external components. The PORT-A output pins are expanded to control twenty LED's through a BCD-to-decimal decoder/driver, with software multiplexing between the two display units. A 2.4576 MHz crystal oscillator also serves as a timebase for frequency measurements.

 

Block Diagram

Prototype Photo
 
 
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