This audio amplifier circuit delivers up to 200 W of top-class quality for loudspeaker from 4 to 16 ohm. Operating voltage is between 24 and 36 V, max 5 A. The frequency response is from 20 to 20000 ...

Graphene has been used to create a triple-mode, single-transistor amplifier that could potentially replace many traditional transistors in a typical integrated circuit.

A single-transistor amplifier, which consists of one transistor and one resistor, is one of the most basic building blocks in analogue circuits. There are three types of single-transistor amplifiers: ...

9.4 Basic Junction Transistor Circuit Configurations As in the case of the thermionic valve, there are a number of layouts, in addition to the simple single transistor amplifier shown in Figure 9.4 or ...

If there were no such thing as an LM386, you could take a very nice op-amp for the voltage gain stage and wrap up the output transistors in the op-amp’s feedback loop to handle the current demand.

A cursory examination of this circuit might indicate that this amplifier uses a conventional composite npn-pnp transistor arrangement, which is nothing new . What is new is the value of R4.

So, all dead transistors replaced with appropriate equivalents, and the amp was reborn. Success, and very much worth the effort! We’ve covered a lot of amplifiers here in the past.