SIX_TONE_CHIME_

Published:2009/7/7 3:18:00 Author:May | From:SeekIC

Separate AF oscillators, gated on by six-stage time-delay circuit, generate six different chime tones. Loudspeakers can be mounted so each tone comes from different location in house. When doorbell button is pushed, each tone generator is turned on in sequence for period determined by individual time controls. System operates from 9-V battery, with CMOS logic drawing very little standby current.-J. Sandier, 9 Projects under $9, Modern Electronics, Sept. 1978, p 35-39.



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