Changes

[[File:Capacitor.jpg]]

[[File:Capacitor.jpg]]

The tuned circuit capacitor, two sheets of aluminium foil approximately 10cm x 10cm separated by cling wrap gave a resonant frequency of approximately 1MHz with the above inductor.

The tuned circuit capacitor, two sheets of aluminium foil approximately 10cm x 10cm sitting loosely and separated by cling wrap gave a resonant frequency of approximately 1MHz with the above inductor.

Still required are the diode and the 0.1uF capacitor. It would be possible to construct the 0.1uF capacitor in the same way, the tuning capacitor is estimated at 100pF (10^-10 F) and the coupling capacitor needed is 0.1uF (10^-7 F). Tightly rolling the layers would reduce the plate separation so it might be possible to get a workable coupling capacitor with less that one thousand times the area.

The 0.1uF capacitor can be made in the same way, the tuning capacitor is estimated at 100pF (10^-10 F) when sitting loose. The coupling capacitor needed is of the order of 0.1uF (10^-7 F). Tightly rolling the layers reduces the plate separation and a workable coupling capacitor was made by tightly rolling only 10cm x 10cm plates.

 

The diode is still required. The original cat's whisker was made with galena crystals.

==Links==

==Links==