99_s_PROGRAMMABLE

Published:2009/7/13 4:10:00 Author:May | From:SeekIC

Line-frequency-based precision interval timer was developed for use with repeaters or photographic enlargers. Circuit is accurate to within 1/60 s. Two 10-position switches are set to desired interval. Connection to AC line gives 4-V square wave for 60-Hz clock input. Transistor type used as relay driver is not critical.-G.R. Allen, Dependable Timer, 73 Magazine, July 1976, p 84-87.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Remote_Control_Circuit/99_s_PROGRAMMABLE.html

Print this Page | Comments | Reading(3)