Very High Gain Crystal Earphone Amplifier

Published:2012/10/22 22:06:00 Author:muriel | Keyword: Very High Gain , Crystal Earphone, Amplifier | From:SeekIC

This simple, one-transistor amplifier provides a voltage gain over 1000 (60 dB) for driving a high impedance ceramic (crystal) earphone. The high gain is achieved by replacing the traditional collector resistor with an unusual constant-current diode that supplies 1/2 mA yet exhibits a very high resistance to the audio. This amplifier will give excellent battery life, drawing only 500 uA.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Amplifier_Circuit/Very_High_Gain_Crystal_Earphone_Amplifier.html

Print this Page | Comments | Reading(3)