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600_Hz_CLAMP

2016-08-03 10:58  
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600_Hz_CLAMP
Polar clamp was developed to provide overvoltage input protection for ±6 VDC teleprinter signals at 10mA. Circuit will withstand input transients up to 120 VDC at 20mA. When input exceeds emitter-base break-down voltage of Q1, Q2 becomes forward-biased for clamping of input. With excessive negative input, Q1 is forward-biased and emitter-base path in Q2 completes clamping action.-R. R. Breazzano, A Polar Clamp, EDN|EEE Magazine, June 15, 1971, p 59.