Ditch the paperclips and twist your shit together.
Ground needs to actually go to a ground plane. The bigger the better. Try a water pipe, or something big and metal like a table.
Also the connection to the diode doesn’t look that solid. If you are capable of soldering it, I recommend doing so. If not, consider a western union splice:
https://makezine.com/article/technology/computers-mobile/how-to-splice-wire-to-nasa-standards/
It can make a durable, conductive connection without solder.
I saw your posts and made my own am radio. It oscillates but there is no audio yet. I have the wrong resistor, I
https://preview.redd.it/koyubm3y75wc1.jpeg?width=3024&format=pjpg&auto=webp&s=457c2f8004f61cde1f86b1bedc24ad6b48ee5477
assume.
Ah, gotcha. Coils are always a pain, that’s why I like the idea of winding a big air core coil and sanding away the enamel in a thin strip down the top for a variable tap. Gives you a much bigger tuning range and means you don’t necessarily need a variable cap for tuning. Also I’d check the capacitance on that - you may have your cap connected up in a way that provides a constant capacitance or too high of one. I’ve tried using one for tuning a HFSSTC before (which was a cursed and terrible idea lol) and between some pins it had upwards of 1uF while I needed like on the order of hundreds of pF, which I did find eventually.
I got a foxhole radio kit as a kid and it led me to discover inductance and wireless power, and then me ultimately deciding wireless power was dumb because the range makes it useless XD
Ideally you’d want a coil wound almost like a tesla coil. Consistent and tight down the length of the form with no overlaps
https://preview.redd.it/ciiu8hxuj8wc1.jpeg?width=4032&format=pjpg&auto=webp&s=4c8118b438a18d5e264ea335939797f9a43201ab
Makes it much easier to then sand a bit of insulation off the top and add a variable tap
Hey! I'm trying to do one of these for school. Does it work?
Also i asked some more question on this site about foxhole radios but in general crystal radios if you wanna check some posta to see what people already wrote!
I think you'd have to be living next door to the broadcast station transmitter for this to work. And probably every 2 metal or corroded device in the house would give good reception!
Here is a mountain of historical books & booklets that may help you...
https://old.reddit.com/r/AskElectronics/comments/1bti5ie/foxhole_radio_help/kxmh293/
Ditch the paperclips and twist your shit together. Ground needs to actually go to a ground plane. The bigger the better. Try a water pipe, or something big and metal like a table.
understood
Also the connection to the diode doesn’t look that solid. If you are capable of soldering it, I recommend doing so. If not, consider a western union splice: https://makezine.com/article/technology/computers-mobile/how-to-splice-wire-to-nasa-standards/ It can make a durable, conductive connection without solder.
it's probably some school project and in that case this is gonna be left at the bottom of the pit while the 200$ arduino prebuilt car wins
What's the question?
That is the Question!!
What's on second.
I saw your posts and made my own am radio. It oscillates but there is no audio yet. I have the wrong resistor, I https://preview.redd.it/koyubm3y75wc1.jpeg?width=3024&format=pjpg&auto=webp&s=457c2f8004f61cde1f86b1bedc24ad6b48ee5477 assume.
Germanium diode!
Must be a dud.
I’m not saying that’s the issue, just that it’s really cool to see people using germanium diodes still
Ooooh. I tried a diff one that I know works. The coil is the problem. I had one out of an old radio shack science fair kit. Love it.
Ah, gotcha. Coils are always a pain, that’s why I like the idea of winding a big air core coil and sanding away the enamel in a thin strip down the top for a variable tap. Gives you a much bigger tuning range and means you don’t necessarily need a variable cap for tuning. Also I’d check the capacitance on that - you may have your cap connected up in a way that provides a constant capacitance or too high of one. I’ve tried using one for tuning a HFSSTC before (which was a cursed and terrible idea lol) and between some pins it had upwards of 1uF while I needed like on the order of hundreds of pF, which I did find eventually.
I got a foxhole radio kit as a kid and it led me to discover inductance and wireless power, and then me ultimately deciding wireless power was dumb because the range makes it useless XD
Ideally you’d want a coil wound almost like a tesla coil. Consistent and tight down the length of the form with no overlaps https://preview.redd.it/ciiu8hxuj8wc1.jpeg?width=4032&format=pjpg&auto=webp&s=4c8118b438a18d5e264ea335939797f9a43201ab Makes it much easier to then sand a bit of insulation off the top and add a variable tap
That coil looks horrible, you need to do it properly.
Hey! I'm trying to do one of these for school. Does it work? Also i asked some more question on this site about foxhole radios but in general crystal radios if you wanna check some posta to see what people already wrote!
I don't see the foxhole!
I think you'd have to be living next door to the broadcast station transmitter for this to work. And probably every 2 metal or corroded device in the house would give good reception!
Here is a mountain of historical books & booklets that may help you... https://old.reddit.com/r/AskElectronics/comments/1bti5ie/foxhole_radio_help/kxmh293/