Schematic diagram of operational amplifier output current expansion circuit

Schematic diagram of operational amplifier output current expansion circuit

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　　Figure 1 shows three integrated operational amplifier output current expansion circuits , Figure (a) is a bipolar expansion circuit; Figure (b) and Figure (c) are unipolar expansion circuits.
0r3N!LF:X2824 In the circuit shown in Figure 1 (a), when the output voltage is positive, the BG1 tube works and the BG2 tube is cut off; when the output voltage is negative, the BG1 tube is cut off and the BC2 tube works. The role of diodes D1 and D2 is to provide appropriate bias voltages to the BG1 and BG2 tubes to eliminate crossover distortion.
FF t"M5@ C2824 The output current of the above three circuits can usually reach about 100mA. When a larger output current is required, one or two more emitter followers composed of high-power tubes can be added.