FOXHOLE RADIO FROM THE PENCIL AND THE BLADE / TUTORIAL

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TIMESTAMPS:

This video is made for entertainment purposes. We do not make any warranties about the completeness, safety and reliability.The following video might feature activity performed by our actors within controlled environment - please use judgment, care, and precaution if you plan to replicate.

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[Albrecht]

I am from germany, your video reminds me back in my childhood (around 20 years ago, i was 12-13);
i built crystal radios using a germanium diode (0, 3 V).
It is really amazing that a normal razor blade and a pencil work as a semiconductor.

That was so exciting:
I moved the wire at the coil and hear voices in the hissing.

Thats what am missing at todays childs:
They don´t do handicraft / things with hands, only watching at their smartphone.

[giancarlo]

Mi hai fatto ricordare gli esperimenti fatti a scuola di elettronica negli anni 70
Bellissimo.. bravo

[bkailua]

We made radios like this in the 50's as kids. This is about the first type of radio ever and was first used around 1900. Nice to see people are still into making them. But only thing new here is how many people think this is "amazing"

[mainscotsboii]

I have that old book from my grandpa it was "All About Radio and Television" by Jack Gould

[BlazeABisLive]

This is something mind blowing please continue with the project

[monicamir]

You talk and make things too fast, it's hard for me to follow.

I had an older brother who did a radio like this when we were kids. This was more than 50 years ago.

I will try to do a little radio.

I wish you could teach how to do a walkie-talkie, too.

I don't know how thin the cooper wire must be.

Thank you for the video.

[ahmedkhedr]

fun fact: the most expensive thing is the copper wire

[BaroodGaming]

keep going bro close to 1M SUBS fun watching your videos.. ✌✌✌

[matsudaindustries]

Amazing video and trivia, your videos sure got better 😋

[noproblem]

I made it back in 70´s from a popular mechanics...i t worked as good as my prior 1N34 tuned receiver back in 1960´s

[HundredsScope]

more of these tutorials pretty cool :)

[faizxo]

Educational, keep up the good work man

[mopkrayz]

best video i saw on this channel this year

[clockworkmultiverse]

This wasn’t featured in “The Great Escape”, but it should have been!

[boscoyu_sci]

Hi, great video! Big fun of these DIY project :)

I am an educator and plan to design a lab to ask my students to build this radio in a lab and then, in turn, teach them P-N junction and semiconductor. I am trying to understand the science behind this Razer diode. After a day of google, I end up knowing it is a "metal-semiconductor" junction or a "cat-whisker detector" and it works like a Schottky diode. However, I am still confused about the following:



1) What is the anode and cathode in this razor-pencil diode?

2) If the steel is the metal and the graphite is the semiconductors, what is the reason for having "blue steel", is it related to the oxide? or is it related to the crystal structure and therefore the bandgap changes of steel after heat treatment?

3) If the iron oxide is really needed for it to work, then there is oxide in both side of the iron, why is it diode? it sounds more like a transistor to me.



I will be very grateful if anyone here can give some insight or direct me to the right source. Many thanks! :)

[whoami]

Does the thickness of the wire on the coil make any difference of the results????

[faslaiqbal]

Can we use earphones instead of speaker

[laertbregasi]

how to make a video projector (not a smartphone projector) witch will have mirrors and have a high brightnes
i have done one and they are jus wonderful but i want some better ideas

[kingjames-fnib]

a diy diode .i did not know. how about a diy electronics tutorial on homemade caps, resistors diodes etc

[navidfarhan]

How doest it runs on your soundbox? Doesn't it need crystal or pizeo electric earphone