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A_C_POWER_INTERLOCK

2017-01-07 23:08  
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A_C_POWER_INTERLOCK
Any device drawing over 5 W (up to amount allowed by D2-D3) will produce 60-cps square wave at base of 01 when device is turned on, to energize relay through Q1 and apply power to receptacle 2.-C. J. Ulrick, AC Power Interlock, EEE, 13:6, p 65.