This circuit from a 1970s General Electric publication applies to motors of the series winding type. SCRs support current equivalents and must be equipped with heat sinks.
This simple circuit is from a Radio Electronics from July 1965. The circuit can be assembled with...
This 6-transistor transistor radio was manufactured in Japan in the 1960s. It is a portable...
This 3-transistor circuit was placed inside a doll, as indicated in the text in Radio Electronics...