This circuit was obtained from Popular Electronics of the 1990s. The circuit uses common transistors today and the frequency is given by the crystal.
This 1-transistor reflex receiver was found in a 1963 publication. The coil is for the mid wave...
We found this circuit in an American 80's documentation. The circuit can be adapted to function as a...
This circuit can be used as a shield as long as the power is supplied with voltage equal to that...