芯片引脚图
2N3055就是NPN型大功率三极管,测量的时候用数字万用表的二极管档,任选两支管脚测量发现都不通的话就说明两管脚是集电极和发射极,测量任何一个管脚和外壳如果相连(电压为0.1V以下),则这个管脚为集电极,剩下的那个管脚就是基极了。然后用红表笔接基极黑表笔接发射极应该显示电压0.5-0.8V表明发射结正常,同样测量集电结也应该差不多,这样的管子就是好的。
2N3055三极管有三个电极,基极(B),集电极(C)与发射极(E),三极管属于电流型控制器件,基极到发射极的电流控制集电极到发射极的电流,三极管有三种状态,截止,放大和饱和,2N3055三极管内部有两个PN结,发射结(基极与发射极之间的PN结),集电结(集电极到发射极之间的PN结),截止时就是发射结截止,集电极上没有电流,放大时就是集电结导通到完全导通之间,集电极的电流随发射结的电流变化而变化(三极管能放大电流,集电极上的电流等于发射结的电流乘以放大倍数β),饱和就是发射结完全导通,集电极电流最大。根据PN极性,可分为NPN与PNP两种三极管,它们的作用和功能一样,只是电流方向不同。三极管一般在电路中用作信号放大或做开关器件。
型号:2N3055
封装:TO-3(铁封)
极性:NPN
配对管:2N2955
集电极最大直流耗散功率Pcm_W:115
集电极最大允许直流电流Icm_A:15
集电极_基极击穿电压BVcbo_V:100
集电极_基极击穿电压BVceo_V:
特征频率ft_Hz:20K
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。
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.。。
利用2N3055构成的20W甲类暖声功放电路图
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