找回密码
 -注册-
查看: 3592|回复: 2

3V工作的便携耳放 寒

[复制链接]
发表于 2002-11-8 00:00 | 显示全部楼层 |阅读模式 来自 辽宁省大连市


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.

--------------------------------------------------------------------------------
 楼主| 发表于 2002-11-8 00:00 | 显示全部楼层 来自 辽宁省大连市
http://users.auth.gr/~mixos/projects/nopcb/audio/010/
回复

使用道具 举报

发表于 2002-11-8 00:00 | 显示全部楼层
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
回复

使用道具 举报

您需要登录后才可以回帖 登录 | -注册-

本版积分规则

Archiver|手机版|粤icp备09046054号|耳机网-耳机大家坛

粤公网安备 44030602000598号 耳机大家坛、www.erji.net、网站LOGO图形均为注册商标

GMT+8, 2024-3-29 06:35

Powered by Discuz! X3.2

© 2001-2013 Comsenz Inc.

快速回复 返回顶部 返回列表