Homemade Foxhole Radio - Plans in the Description.

This is my Foxhole Radio, i built it for less than 5€ , it's very easy to make that's why i put the plan so you can make one at home too, if you want :D .. This radio works with radio waves transmitted by AM transmitters received through the antenna, the coil then the Germanium diode. The coil and the diode transform the signal to audible waves, send to the speaker and to your ears.

What you need to make it :

- An earphone ( or some computer speakers but you have to build a lil' adaptator to plug it, that i did)... mines comes from an old phone, it's about 2000 Ohms.

- A variable capacitor, mines' from a children AM radio, but you can use a razor blade and a pencil instead of this, just google it to know more ;) ...

- Some electric wire to make the antenna and connection to the ground ( or to a radiotor, that is connected to the ground )

- Copper wire, we don't care about the diameter .. it only has to be coated. Do about 100 joined loops around a ..

- 4 centimeters (about) diameter pipe.

- A germanium diode, i think every kind of those diodes'll do.

Here are the plans :
http://img689.imageshack.us/img689/7461/p16021015240001copiecop.jpg
and
http://img708.imageshack.us/img708/9278/p17021016290003.jpg

Good luck ! If you have any question about it, just ask it, i'll be glad to answer it :D ... Don't forget to comment and rate !

Category:

Science & Technology

Tags:

• foxhole
• radio
• free
• energy
• no
• diy
• coil
• poste
• galène
• galene
• how
• make
• AM
• electricity
• germanium
• plan

[eljer55]

You should hook up a light bulb in place of the speakers and see if it lights up. If so you have just replicated Nickola Tesla's free energy circuit. Speakers need electricity to work and so a low circuit light bulb should burn steady from the power recieved from the radio waves. Try it.

[elektron300]

@eljer55 I've just tried it now and it doens't work :/ i tried many kinds of low energy Led but there's not enough power to light them.

[mtdeezy]

you mean variable resistor?

[elektron300]

@mtdeezy : No, it's a variable capacitor ;)

[prankmypants]

@elektron300 You need a coil tuned for every ambient source of energy you want to harvest. I managed to get a led to flash for a split second after charging a capacitor for 10 mins.

[powermaks]

@elektron300 you are going to need something very efficient like a power led of more than 80 lm per watt, (cree xml t6 or u2, xp-g r5, the new line of luxen leds, etc.) a MUCH longer antanna, (at least 7 foot streched out) and tuning to a powerful station.

[co2isgoodal]

It's cool to be so close to a lot of different countries.

I make my own detectors from iron pyrites and razorblades. I've heard stations 300 miles away with a razorblade detector, variable condenser, homemade coil and a piezo earphone.

Last night I heard a local station using an old penny as a detector. It wasn't nearly as loud as the razor.

[CyberSword10]

@elektron300 Did you try an actual Light Bulb?

[Diegor1901]

@cekpi7 Thought that was only for batteries...never investigated much about it...but you really think so?... :) I'm going to google it right now, thanks for the idea, and sorry for the intromission xD

[Diegor1901]

@elektron300 It'd work if you were really near a radio station... :D

[MediaHoax]

Nice radio ! I have build one myself and it works great !

I used only a diode and a coil.

[cekpi7]

@elektron300 i think you should try with joule thief maybe it will work

[lukepavlovic]

you know i am 7 years old and it only picks am signals