The schematics show the circuit with a 2N3906 general-purpose PNP transistor, but the 2N2907 and 2N4403 have also been used successfully. In circuits 1, 2, and 3, the LM386 inputs are connected ...

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Even cooler, with Collin's video under your belt, you can now take a look at the schematic for the Intel 4004 (pictured below the video) -- the world's first single-chip CPU -- and (very roughly ...

Shown in (a) and (b) are schematic diagrams (left) depicting the operating principles and experimentally measured output resistances (right) of a p-type pass-transistor (a) in the ON state, that ...