Equivalent transistors can be used in this circuit for automotive applications in the 1980s. The frequency is given by the capacitor and the current of the lamp depends on the LM195 transistor.
This stage of low power audio amplification was very common in devices powered by the 60's and...
This different circuit was found in a Radio Electronics from August 1965. It works with a voltage of...
This circuit was found in a 1980s documentation from the manufacturer of the integrated. The...