Expensive and complex base drive circuit hence not

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Expensive and complex base drive circuit. Hence not popular in new products. I C V CE I B v-i characteristics V CE (sat) BJT: symbol (npn) + V CE _ I C I B C (collector) B (base) E (emitter)
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19 BJT Darlington pair Normally used when higher current gain is required 2 1 2 1 1 2 1 1 1 1 2 1 1 2 2 2 1 1 2 1 1 1 2 1 1 1 b b b b b b b b b b b b B c B B B B c B c B c B c c B c I I I I I I I I I I I I I I I I + V CE _ I C2 I B2 C (collector) E (emitter) I C I B1 B (base) I C1 Driver Transistor Output Transistor Biasing/ stabilising network
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