小弟想要DIY音响声控电路图装在一粒没有volume control/variable resistor的amp。
输入/输出=stereo
我试过用variable resister来调，可是不行
我看到几个电路，可是有些不明白，想请各位给点意见
电路1
(http://www.electronic-circuits-d ... es/audiockt11.shtml)
Digital Volume Control
This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls reverse (volume decrease) operation of both channels.
A readily available IC from Dallas semiconductor, DS1669 is used here. FEATURES: - Replaces mechanical variable resistors
- Electronic interface provided for digital as well as manual control
- Wide differential input voltage range between 4.5 and 8 volts
- Wiper position is maintained in the absence of power
- Low-cost alternative to mechanical controls
- Applications include volume, tone, contrast,brightness, and dimmer control
The circuit is extremely simple and compact requiring very few external components. The power supply can vary from 4.5V to 8V.
这里的输入/输出只有一条线，而stereo却有三条线，如何接呢？
电路2
（http://www.nxp.com/#/pip/pip=[pip=TDA1524A_CNV_2]|pp=[t=pip,i=TDA1524A_CNV_2]）
The device is designed as an active stereo-tone/volume control for car radios, TV receivers and mains-fed equipment.It includes functions for bass and treble control, volume control with built-in contour (can be switched off) and balance.All these functions can be controlled by d.c. voltages or by single linear potentiometers.
- Few external components necessary
- Low noise due to internal gain
- Bass emphasis can be increased by a double-pole low-pass filter
- Wide power supply voltage range.
请问还有什么电路比较合适呢？
谢谢大家 | 
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发表于 19-1-2009 01:37 PM
变色卡
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