Experimenting with various circuits, and using the Mystery set as a
starting base, I wanted to create a receiver with a double-ganged (oder
döppelganger) capacitor. This turned out to be not as
simple as it first seemed. Simply replacing the two variables with a
döppelganger made the set untunable, because the two rotors
are connected together and are inseparable. So, I began tinkering with
the circuitry, trying this and that. The circuit that worked best
seemed impossible. Indeed, some who see this will probably proclaim it
be impossible. To the contrary, it is not only possible, but a fine
I call this weird circuit the Crazy Crystal Set. Notice that
there is not a single resistor or fixed capacitor. The astonishing
the dead end coil, L2, connected to an antenna but going
nowhere! I have never seen such a circuit in print before. However, it
works beautifully! Here are some of my photos.
Another back view all the way to the front.
This view is from the left side.
This is a closeup looking down into the coil, showing how the crystal is mounted.
A fisheye view of the same.