May 6th, 2011 | 
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Mу 10 year ancient son worked long аnd hard οn thіѕ thing аnd everlastingly gοt іt effective. Hе іѕ аblе tο pick up іn thіѕ area 15 stations. Thіѕ thing іѕ sweet сοοl. Hе won first рlасе аt hіѕ lecture аnd constituency science fairs. Hе positioned 3rd аt regional. Sweet сοοl tο bе sure.
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25 Responses to “Tunable Foxhole Radio”
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nice work. i’m gonna try and make one
Thankfulness for a fantastic video
@fanoffail Use an amp.
this is the best radio i have seen on youtube, you give reasons for it sooooo well!
how do you glue it to the speakers
marvel if approaching an iron bar into the toilet document roll may maybe find a rank too. b/c the iron bar must chat the reminiscence freq of the path
An simpler method is to add a wavering capacitor to tune stations
I used to build these when I was a kid,I scrounged the tuner thing from and ancient valve radio,that was how I may maybe tune mine,,and used a germanium diode in place of the razor blade…then if i hooked it up to an amp,I had a exact AM radio that elected up all the local stations,my coils were 3inches in diameter and only used 80 turns of wire and worked impeccably.
@LawietStandard I would very to call it, an act of physics.
@cuzuco09 until the metal is a bluish affect.
@davidrodgersNJ If you want to tune a fox hole radio, you need to add either a tuning capacitor, or do what this guy did and make the coil tuner. for a more technical description, google Crystal set radios, and Cats whisker radios, and don’t forget to click the images tab, you’ll find lots of schematics for all kinds of designs,
@davidrodgersNJ In fact, the pencil and razor is a type of crude diode called the cat whisker, the diode or cat whisker in this case is the detector, the mast coil tuner is one method, I used a tuning capacitor from an ancient transistor tube radio. the cats whisker diode, is not in fact the tuner, by moving the pencil nearly you are fine tuning the diode for max detection, sort of like finding the sweet spot on the razor, if you want a tuneable fox hole, you need to-
what kind of razor blade did you use? platinum or stainless?
Can you give reasons for the alteration between the tuner that connects directly to the coil and the tuner that is the pencil connected to the razor blade?
BTW fantastic job! thankfulness for redeployment.
@utahike How long do you let it GLOW for? We did this but were unsure how long to leave the flame on the blade while it glowed red. Thankfulness!
@855h0le You are assess abou t the bridge and halfwave trectifiers but rectifier, but here you aren’t ‘rectifying ac like for a power supply, just detecting thee amplitude modulated”envelope” as the carrier rises and cascade. one “side of the lilt indicate clear or negative “lilt is all you need. so one diode facility.
@Blissterd1 ARe you sure? Cause it takes 4 diodes to make a Full Wave Rectifier..
2 for a half wave when it comes to a/c to DC. I am curious now- Im having a Mental block and the pledge must be ez..
I made a tunable den radio with 120 turns and it facility just fine.
@theMISTERclean Doubtless not. You will doubtless need a high impedence crystal earphone, aka a Piezoelectric headset.
@YoungMillionaire the term “disturb a curfew” in electronics is sweet literal. The term originating from running it into the disturb a curfew literally. If you can find a dyed-in-the-wool disturb a curfew (such as the third pin on US wall outlets) that’s the ultimate way, but any grounded piece of metal will work as well in all-function.
everywhere does the disturb a curfew connect to? What does the yellow wire connect to? How does disturb a curfew work? what would act as a excellent disturb a curfew for that yellow wire that goes out? what do you have it plugged into? thankfulness…
shit
Awesome job son! I like den radios.
ok now lets see you use a piece of galena rock and a protection pin
how bout a home made tuning cap?
I wish I was as smart and curious as him when I was his age.
Fantastic job.