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 circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals...
This circuit that appears in similar versions on this site was found in a Popular Electronics from the...