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Performs function of switch by means of relay contacts when SCR is triggered by placing finger on touch plate. Values shown keep relay energized for 5-10 s after touch. Developed as replacement for switchtype controls on amateur radio receiver. Once SCR has fired, it conducts until charge on 1000-μF capacitor decreases enough to drop SCR current below minimum for conduction.-J. J. Schultz, Rapid Receiver Control Switching, 73 Magazine, Dec. 1973, p 67-69.

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