SUBAUDIBLE_TONE_ENCODER

Published:2009/7/20 4:50:00 Author:Jessie | From:SeekIC

Simple crystal-controlled oscillator drives CD4020 CM0S divider to give output frequency below normal voice range, for providing tone access to repeater. With 1.120-MHz crystal and division ratio of 8192, output is 136.7 Hz. Output circuit is RC filter that converts square wave to triangle, with pot setting level. Article tells how to choose crystals for other output frequencies and division ratios.-C. Haines, Jr., Go Tone for Ten, 73 Magazine, Dec. 1976, p 22-23.



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