The integrated circuit of this amplifier is not very common today. The output transistors can be TIP31 and TIP32 in heat radiators. The circuit is from the 1977 National Semiconductor Audio Handbook.
This circuit for incandescent light bulbs was suggested by General Electric in a 1980s...
This circuit acts as a VU-meter when connected at the output of any audio amplifier, triggering a...
The circuit shown in figure 3 uses a programmable unijunction transistor (PUT) of the BRY39 type...