Synchronized_oscillator_Circuit Diagram World 
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2016-08-30 22:38  
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This circuit shows a line-synchronized oscillator that will not lose lock under noisy line conditions. The circuit is suited to applications that require a reliable 60-Hz line-synchronous clock, and is superior to the usual zero-crossing detectors and simple voltage-level detectors. In this circuit, the basic RC multivibrator is tuned to free-run near 60 Hz, but the line-derived sync input forces the oscillator to lock on the ac line. Linear Technology Corporaton, Linear Applications Handbook, 1990, p. AN12-6.