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标题: 3V工作的便携耳放寒 [打印本页]

作者: sadeness 时间: 2002-11-8 00:00
http://users.auth.gr/~mixos/projects/nopcb/audio/010/

作者: 自由的风 时间: 2002-11-8 00:00

以下是引用sadeness在2002-11-8 20:44:00的发言：
http://users.auth.gr/~mixos/projects/nopcb/audio/010/

没什么价值

作者: sadeness 时间: 2002-11-8 00:00
标题: 3V工作的便携耳放寒

R1_____________10K 1/4W Resistor
R2____________100K 1/4W Resistor
R3_____________68K 1/4W Resistor (see notes)
R4______________1K5  1/4W Resistor
R5______________3K3  1/4W Resistor
R6____________330R 1/4W Resistor
R7______________4K7  1/4W Resistor
R8______________2R2  1/4W Resistor

C1______________1礔 63V Polyester Capacitor
C2____________100礔 25V Electrolytic Capacitor
C3____________470礔 25V Electrolytic Capacitor

Q1____________BC239C  25V 100mA NPN High-gain Low-noise Transistor
Q2____________BC337 45V 800mA NPN Transistor
Q3____________BC327 45V 800mA PNP Transistor

J1____________Stereo 3mm. Jack socket

SW1___________SPST Switch

B1____________3V Battery (two 1.5V AA or C cells in series)

Notes:

Can be directly connected to CD players, tuners and tape recorders.
Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohms.
Schematic shows left channel only.
B1, SW1, J1 & C3 are common to both channels.
R3 value was calculated for headphone impedance up to 300 Ohms. Using 600 Ohms loads or higher, change R3 value to 100K.

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