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50mv是两个输出管集电极之间的电压,也就是两个0.33大电阻两端的电压。
原贴推荐的静态电流为75ma,所以50mv/0.66 = 75.75ma
Connect a multimeter between the collectors of Q7 and Q8 - you are measuring the voltage drop across the two 0.33 ohm resistors. The most desirable quiescent current is 75mA, so the voltage you measure across the resistors should be set to 50mV ±5mV. The setting is not overly critical, but at lower currents, there is less dissipation in the output transistors. Current is approximately 1.5mA / mV, so 50mV will represent 75mA quiescent current. |
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