This amplifier was obtained from an Electronics Now from the 90s. The circuit has a dual 26V power supply. Power integrated circuits must be equipped with good heat sinks.
In the figure the well-known basic configuration of relaxation oscillator with unijunction...
June 2017 - New high power TVS for high-power retention applications with bi-directional features...
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....