BATTERY_OPERATED_DICTATING_MACHINE

Published:2009/7/24 4:47:00 Author:Jessie | From:SeekIC

Amplifier voltage is regulated by Q5 and zener diode. Q6 functions as on-off switch controlled either by microphone switch or by metallic coating at both ends of two-track tape.-L. Hannemann, Pocket-size Dictating Machine, Electronics, 33:44, p 73.



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