This circuit that can be activated by light or heat was found in an old American documentation, but the components it uses are perfectly current. The power transistor shall be fitted with a heat sink.
L1 is the secunday wound of a common power transformer with voltages between 6 and 12 V and...
With 12 V of power and 8 ohms in each speaker we have 1.6 W of power per channel. With a 22 V...
This circuit is from the time when seat belts were still being adopted. Obtained from a 1976...