ACCESS_TONE_GENERATOR

Published:2009/7/20 19:54:00 Author:Jessie | From:SeekIC

Produces audio burst for 0.5 s at frequency determined by R1 and C1, for use with FM transceiver as subaudible tone generator to access repeaters. Provides buffered outputs of square waves as well as triangle waves. Uses NE566 function generator as voltage-controlled oscillator having excellent stability and linearity, R1 should be between 2K and 20K. SCR should be type that triggers at 70μA.-E. Kanter, PLL IC Applications for Hams, 73 Magazine, Sept. 1973, p 47-49.



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