One KHz Synchronous Detector Circuit

One KHz Synchronous Detector CircuitThis circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude with the 1 kHz signals when a 2nd at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or exhibit. An LED about the board also lights when the measured signal exceeds a preset threshold.This