Joule Thief

[Koen1]

I was thinking about making a fox hole radio.
And replace the head set with a rectifier and see if I could get enought voltage to run a JT.

Here is a link that shows how to build one.

http://bizarrelabs.com/foxhole.htm

Yes, that should be doable.
Although, if I recall my crystal radios 101 correctly, such a foxhole/crystal radio
actually uses a fair part of the collected potential to actively filter out the
other radio frequencies...
And if I am not mistaken in that, then it would seem to produce only
a specific selected frequency output signal.
Would removing the frequency filter LC circuit and using only the
sensitive germanium diodes (or rectifier) not result in the accumulation
of all available charges, instead of only those that match the selected
frequency?
In other words, would a "Tate Ambient Power Module" aka "energy from thin air"
circuit, basically a very sensitive diode rectifier with collector capacitor,
not produce more usefull potential than a crystal radio?

Regards,
Koen

[gadgetmall]

I was thinking about making a fox hole radio.
And replace the head set with a rectifier and see if I could get enought voltage to run a JT.

Here is a link that shows how to build one.

http://bizarrelabs.com/foxhole.htm

Yep Slayer its possible to put a transformer on that output to boost it . I understand that if you can't find a Crystal earphone (60's 70's) you can use an old telephone ear set and put a transformer  on it to hear thru the piezo tele ear piece so i guess this is enuff to put a diode and and see what it produces.

[nievesoliveras]

@all

I did not want to say anything yet, but I am having a tremendous success!!!!!!
http://www.overunity.com/index.php?topic=6362.msg158838#msg158838

Jesus

[nievesoliveras]

About the foxhole circuit.
That was what I had on my mind a few days ago.
Look at this photo I found!

Jesus

[WilbyInebriated]

I was thinking about making a fox hole radio.
And replace the head set with a rectifier and see if I could get enought voltage to run a JT.

Here is a link that shows how to build one.

http://bizarrelabs.com/foxhole.htm

hi slayer, jesus and i talked a bit about this back at the start of the thread. i had showed an aircore coil from my crystal radio in a jt circuit to demonstrate that a ferrite core was not needed. jesus thought i was powering the jt from radio waves at first. he expressed a desire to be able to light an led with a non battery powered crystal radio. the idea was mulled over and i suggested he use a led in place of the germanium diode as well as using a bifilar crystal radio coil so the voltage/current could be stepped up or down as needed. i like the idea of using the output to power a jt, i think a bifilar crystal coil would work best in this case also.
red leds and schottky diodes work well in crystal radios in place of the germanium. i can repost the crystal radio circuit with the bifilar coil if you want, the coil can be wound on an empty toilet paper roll. it works very well.