Crystal Radio Tuning

This radio pulls in two stations, China Radio International which transmitted from DC, and another from Annapolis I believe.
I used one antenna coil and one trap coil with two variable capacitors.

Category:

Science & Technology

Tags:

• Crystal Radio
• DIY

[mdnghtrdrr]

Do you have a schematic of your radio?

[lai2ke4]

@mdnghtrdrr No, since I don't do that based on a single schematic but do modifications all the time. Just search the net, there are hundreds of them.

[fishtankbank]

is it possible to make one without enameled wire?

[lai2ke4]

@fishtankbank  Yes.

[Munkki345]

I've recently built same the kind of crystal radio as yours. I tried adding two different kinds of variable capasitors between the coil but both of them don't work. The radio channels keep changhing by itself. Could you please tell me what should I do?

[lai2ke4]

If you look closely, there are actually two coils. One antenna and one trap. The two variable capacitors connected in parallel with these two coils.

[yrtuag]

What an alternative to enameled wire? 

[AcePilot101]

A crystal radio does not use batteries. It draws electric power from the radio signal.

In theory, a Tesla generator draws electric power from the sun by connecting a circuit between the ionosphere (magnetosphere) and the earth.

Remember, light is just the visible spectrum of electromagnetism.

[rockangel1967]

@mdnghtrdrr i found some kits at xtalman d o t com

they even have one with a tube. i think im going to buy one there

[fishtankbank]

@lai2ke4 is a thinner or thicker gauge more beneficial? does it matter?