2N3055應用電路（一）
下圖是一采用功率三極管組成的線性穩壓電源電路圖，2N3055可以采用其他相同規格的三極管代換，2N3417可用BD139或其他三極管，二極管1N914也可以采用常用二極管1N4148.
T1采用220V（或110V）轉6V到7V左右的變壓器。如果變壓器的采用1-2A輸出電流的，測該電路的輸出電流大約為1A左右。
2N3055應用電路（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應用電路（三）
利用2N3055構成的20W甲類暖聲功放電路圖
