Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be replaced with equivalents. MOSFET is the critical component of the circuit.
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...