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Uses two sections of 7400 quad NAND gate. Will accept input voltages of 10-50 V P-P with values shown, but can use line voltage directly if input resistor is 22K and feedback resistor is 220K. Diode in DC supply limits positive-going input to 5.7 V forprotection of input circuit. Used as interface between 60-Hz line and frequency divider having TTL logic, when 1-s time base is required for timing applications.-W. A. Palm, Connect a 7400 Gate as a Schmitt Trigger, EDN Magazine, Aug. 20, 1976, p 84.
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