This circuit was found in the April 1970 Radio Electronics magazine. The dual function circuit uses 4 transistors and is connected to the vehicle's contact breaker.
This Nixie pipe circuit was found in 1965 documentation. Note the high supply voltage. Appropriate...
This circuit is from a 1976 publication, but it can be assembled with modern components. For the...
Found in Popular Electronics from the 90's, this circuit consists of an audio oscillator for Morse...