The OTL Earphone Amplifier composed of double triode ECC822 electronic value circuit diagram

Published:2011/6/2 21:11:00 Author:Sophia | Keyword: Double triode, ECC822electronic value, OTL Earphone Amplifier | From:SeekIC

As shown, the curcuit is using the double triode equivalent of E802C、E82CC and North American12AU7 and domestic 6N10as amplifier, This kind of transistor is characterized by excellent indicator and long service life. HD head Amplifier will produce enough signal amplitude to drive earphone. Audions of base pin 1,2,3 amplify signal. Input signal arrives circuit board through 50kΩvolume control logarithmic potentiometer p1(p1 is not shown in the diagram), and pass C1、R1 to input to pre-amplification. meanwhile,R1、C1l must provide indispensible negative grid bias. Gain is decided by R8, and maximum input voltage is determined by R2. R9 is to determine that static anode current is in utmost linear part of characteristic curve. The input signal amplified by phase reversal in positive pole arrives the second stage grid through C2 coupling.The second stage cathode resistance is divided to R5 and R6. R5 and R6 connect in series to form load resistance.



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