Well, I have two links in the video description but one no longer works and the other one's store is closed for maintenance. www.midnightscience.com store.scitoys.com/radio-kits-and-parts.html

You could try but there's not a lot of current here to run a transformer. I think you'd want to step down the voltage though, not up. But that just means turning the transformer around.

If they're germanium diodes then they should work. Are you sure they're germanium diodes though. Most diodes that you see these days are silicon diodes and those require a more power signal from the radio waves, usually meaning an antenna a hundred or more feet or being very close to the radio station so that you get a strong signal..

Yes. You can connect it to an amplifier (powered speaker) like I did with this homemade one in this video kzbin.info/www/bejne/gKWzqKuYhMx1ftk .

It's around 4.5cm in diameter.

Already done. Here's how to make it kzbin.info/www/bejne/m3rHeaagm8eWodk and here's how it works kzbin.info/www/bejne/lWWQhKtjiZuJeMU

I'm not sure that would have been any better, probably just as good. The diameter of my circular cardboard piece varied a lot, it was pretty rough. A line across the longest diameter may not even have crossed the center. But similarly, when I measured the diameter, I also may not have found a line across the center. With an ideal circle, both methods would work. (That's assuming I understood correctly what you described.)

The voltage is around 5 volts and the current is just under 1 amp. You can see me measuring is in my video about how to make it kzbin.info/www/bejne/rXzSlGpjdrV5qc0

I don't know. But it can be made smaller by putting a ferrite core inside the coil, then the coil can have a smaller diameter. The capacitor can be made smaller too, there are smaller commercially made variable capacitors you can buy. You'd still need a good antenna though. I made a bigger, portable one using a pizza box here kzbin.info/www/bejne/mnOQaGmEmcuHmLc

Haha. I was on the research for ‘magnetic field paper’ in an instant. It looked amazing against the new iPad 👍

Nice.

I'm busy with other projects right now but out of curiosity, what type of shield are you thinking about?

Thanks! I'm not sure which other symbols would be common other than maybe the transistor and inductor. I do have this webpage rimstar.org/science_electronics_projects/electronic_symbols_for_schematics.htm that lists the one I went into in this video plus a few more, including some uncommon ones.

I can hear it, but using earbuds. You can't make out what the guy on the radio is saying but you can tell someone's speaking. In this video kzbin.info/www/bejne/gKWzqKuYhMx1ftk I make and connect it up to an amplifier so you can certainly hear it there.

It sounds like you're using a much too powerful soldering iron. 50 or 60 watts should be enough. 30 watts is usually too little. You could also be holding the tip of the iron on there for too long, only a second or so should be needed.

I'd recommend looking at some videos specifically on soldering to breadboards. There's is some technique to it.

Thanks! I don't know about the genius part but I certainly have a strong curiosity and a love of learning!

@@RimstarOrgthe fact you feign humbleness is all the more proof, you understand objective progress is more important than superiority, if you don’t feign humility progress in this society is impossible.

I'm with you there. The key is to actually do something, make progress. One step at a time works for me. Many small steps combined together makes something great.

No crystal is needed. In the early 1900s, the diode was actually a chunk of galena crystal and you'd touch it with the sharp tip of a wire but these days you use a diode like the one I show in this video.

I don't have any precise specs, it's all from parts I could easily obtain. However, I do go over the parts and how to make it in this video kzbin.info/www/bejne/r4uagaWNiruKhpo

That's a lot of questions. This video kzbin.info/www/bejne/e6S9goZofLSAh6c shows how I made it and has all the dimensions for the capacitor and coils. This one has another way of making the variable inductor (coil) kzbin.info/www/bejne/mmXcnoZ9fZVggNE using taps. There are many ways to make a crystal radio, but the basic idea is to have capacitance and inductance to tune into a specific frequency (preferably) and that capacitance and inductance can be in the antenna, coil and/or capacitor. In my radio I use an inductor (coil) and capacitor in parallel (there are also series circuits). This video one goes into how the crystal radio works kzbin.info/www/bejne/fqbTd4yVZ5miY5Y and I have specifc videos for how the parallel circuit works but they're best viewed from my webpage which also has calculators rimstar.org/science_electronics_projects/coil_design_inductance.htm and rimstar.org/science_electronics_projects/lc_circuit_aka_tank_or_resonant_circuit.htm .