How good an amplifier was your circuit ... thousand times per second, at the transistor’s input. You’ll hear the resulting output through the speaker. 1. Assemble the circuit shown in the ...

implementing as it does a complete simple op-amp with five transistors. Looking at the circuit diagram it follows the classic op-amp with a long-tailed pair of NPN transistors driving a PNP gain ...

Thus the amplifier is only one part of the circuit, and speakers ... Is this £10 Chinese audio kit better than any transistor amp simply because it has a couple of tubes? We don’t think ...