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原帖由 晗晗 于 2008-7-1 14:20 发表 
开声有段时间了,感觉声音不错,低频控制力也很好。中点电压110MV,4R负载温度很高,连续满载工作4小时也没烧掉。
在功率管发射极的0.22欧电阻两端测电压6MV.怎么在下臂另外的0.22电阻两端测不到电压呢?????/ ...
that means your upper output device is idling at 6mv/0.22ohm=30ma.
the current going through the 4ohm load is 110mv/4ohm=30ma.
thus, all of the idling current is going through the 4ohm load and nothing through the lower output device.
you should adjust the dc offset first and then the idle currrent. and repeat the process.
BTW, I typically idle my amp so that the voltage drop on the resistor is about 25mv. |
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