RESPONDER_FOR_13_KC_DOG_WHISILE

Published:2009/7/23 22:35:00 Author:Jessie | From:SeekIC

Tuned stages Q1-Q2-Q3 each having 700cps bandwidth, staggered to give total bandwidth of 1.7 kc for amplifier. Untuned stage Q4 maximizes gain yet prevents operation of device by circuit noise. Diode detector D1 makes Q5 conduct, energizing relay K1 and sounding response bell for 25 sec(controlled by charging of C3).-M. R. McGraw and I. Aleksander, Ultrasonic Frequency Responder Aids Blind, Electronics, 34:43, p 48-49.



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