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Transistor performance speed measurement circuit

Transistor performance figure for the speed measurement circuit. The figure, HFC9300 for music integrated circuit, the memory of a song. BL for the speakers, S for the trigger switch. VTx as a transistor under test, insert it into the socket, and insert the pin collector "c", base insert "b", the emitter into the "e". If VTx good pipe, BL will play out a beautiful song; if VTx bad management, then silence.

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Transistor performance speed measurement circuit