为了使高阻信号源与低胆负载匹配,经常利用两极发射极输出器(图1和2).在反馈回路里由第二个晶体管产生的额外放大较之一级电路可以得到更好的参数:较高的输入阻抗和较低的输出阻抗.在两极发射极输出器里晶体管可以按直流并联(图1)或串联(图2).当并联时,可以利用n—p—n型和p—n—p型晶体管的组合把晶体管直接连接起来(在晶体管串联电路里,可以采用稳压管作为连接元件).按照交流并联和串联的电路进行计算是相同的. In order to match the source of high impedance with the low darkest load, bipolar emitter followers are often used (Figures 1 and 2). The extra amplification produced by the second transistor in the feedback loop results in better parameters than the one-level circuit : Higher input impedance and lower output impedance In bipolar emitters the transistors can be connected in parallel in DC (Figure 1) or in series (Figure 2). When paralleled, the n-p-n and p The combination of -n-p type transistors directly connects the transistors (in a transistor series circuit, a regulator can be used as a connecting element.) The calculation is the same in AC-parallel and series-connected circuits.