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.
Found in the 1991 Electronics Experimenter Handbook, this circuit detects voltage variations in...
This well-designed 4-transistor JFET audio oscillator circuit was found in the June 1969 issue of...
This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American...