UNATTENDED_RECORDER

Published:2009/7/14 5:44:00 Author:May | From:SeekIC

Uses 567 tone decoder in circuit designed to respond to 1-kHz tone, to turn on recorder for taking message when receiver of amateur station is unattended. R6, C5, and 741 opamp U2 form timer that turns on RS-267-20t6 transistor and pulls in relay to turn on tape recorder for recording about 30-s message. Relay then drops out. Use well-regulated 5-V supply. All transmitters using this ser vice must have 1-kHz audio encoders for proclueing required control frequency Article givesconstruction and adjustment details.-R Perlman ,The FM. Auto-StarT. 73 Magazine, April 1974.p 21 and 23-24.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/UNATTENDED_RECORDER.html

Print this Page | Comments | Reading(3)