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.
Sounds and ultrasounds can be generated with the circuit shown in the figure. What we have is a...
This simple MAT generator circuit was found in a 1986 documentation. The Q2 transistor can be...
The two circuits are from Motorola's Linear Databook from 1990. The resistors depend on the gain...