2N3055应用电路（一）
下图是一采用功率三极管组成的线性稳压电源电路图，2N3055可以采用其他相同规格的三极管代换，2N3417可用BD139或其他三极管，二极管1N914也可以采用常用二极管1N4148.
T1采用220V（或110V）转6V到7V左右的变压器。如果变压器的采用1-2A输出电流的，测该电路的输出电流大约为1A左右。
2N3055应用电路（二）
Simple and low cost. The optimal supply voltage is around 50V， but this amp work from 30 to 60V. The maximal input voltage is around 0.8 - 1V. As you can see， in this design the components have a big tolerance， so you can build it almost of the components， which you find at home. The and transistors can be any NPN type power transistor， but do not use Darlington types.。。 The output power is around 60W.
Some comments：
- capacitor C1 regulates the low frequencies （bass）， as the capacitance grows， the low frequncies are getting louder.
- capacitor C2 regulates the higher frequencies （treble）， as the capacitance grows， the higher frequencies are getting quiter.
- this is a class B amplifier， this means， that a current must flow through the end transistors， even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases， the sound of the amplifier gets better， but the end transistors are more heating. But if this current decrases， the transistors are not heating so much， but the sound gets worse.。。
2N3055应用电路（三）
利用2N3055构成的20W甲类暖声功放电路图
