This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.
This 15 W power stage was found in Radio Electronics magazine from August 1959. The transistors are the...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
This article is old, from 1994. But, for those who have an old PC and want to use a joystick from...