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TC7136/TC9400 Digital Readout Frequency Meter

From Microchip Technology, Inc.
 

 
Two low-cost integrated circuits can be combined to create a simple digital frequency meter. The combination of a frequency-to-voltage converter (FVC) and a dual-slope, analog-to-digital display converter (ADC) makes a small 2-chip frequency meter that can be run from one 9-volt battery.
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