While I haven't seen any build information; the radio I currently want to know more about is from the same UA-camr that developed the credit card crystal radio. His latest has a printed shell and uses a very basic form of tuning with a loop of wire revolving inside another loop of wire. He's a genius at making small, simple designs. My first was a rocket radio purchased from a comic book ad in the 60's. I never did hear a peep out of it and threw it away. Knowing what I do now I wish I still had it. I got the parts now to try building a UA-cam radio called the almost solderless crystal radio. (I think that's the name) It uses a diode and cheap inductors that look kind of like resistors and ceramic disc capacitors for tuning. It's a breadboard radio and if it works I'll probably solder it together on a piece of perf board and maybe make a small box for it.
Air Core Pipe Tip = I found a very simple way to improve a toilet paper roll to make a robust tube. You will need the first cardboard tube, cut to your desired length. You will also need another similar tube of a longer length - add say 2 inches/50mm. We will be strengthening the original tube, by adding additional cardboard layers inside this tube. This is a messy process. You will want to protect the outside surface of the first tube (the one that will receive the wire windings.) We will be using common liquid white paper glue. We do not want the glue to get on the outside of the main tube, because Mr. Brownie has taught us that any glue bumps will disrupt the wire windings. So, maybe cover it with removable blue painter's tape, or with plastic wrap. Here's the trick... Carefully cut the longer tube along its twisting diagonal seam. Coat the outside with liquid white glue. Twist the tube back together, overlapping the diagonal edges to reduce the diameter of the tube. Slide this assembly into the first tube. Untwist it, to expand it, to fill the inside of the first tube and attach it to the first tube's inner wall. Align the diagonal seam, to make the edges completely smooth. It will self-adjust, in its length. You will find the ends of inner tube that extend beyond the inside of the first tube are not aligned. This is no problem, so long as the diagonal seam is aligned for the full length of the first tube. Let the glue dry, overnight. Trim the inner ends to match the outer ends. Repeat, as you desire. The result is surprisingly strong and the effort is quite satisfying. Practice aligning the dry components, before applying the glue. I hope this helps someone. Ask questions, if the steps are not clear.
Thanks again for your content. Great breakdown of various radio builds. The dual cap with the large coil is very nice looking. I've built two wiper radios since seeing your channel and now I want to experiment with design changes and aesthetics. I went for acrylic tube on my first two and a translucent-green resin printed base that contrasts really nicely with the reddish copper/varnish of the coil. I look forward to your next build.
The data for each radio is in the description under each individual radio video. The links are in this description. You can try the earpiece, but there are many types so I can't say for sure. It's worth a try.
i built a very basic one. only using that old telephone earpiece. fix station. no tuning. i used the crystal diode soldering it across the earpiece terminal. and one terminal connection goes to antenna n one to the ground. and the sound was audiable from the earpiece although low. And now i see so many types and improved one in UA-cam.
A while ago i ran across a crystal radio [on the internet, probably here on yt] that used not 1 but Two 1N34 germanium diodes for full rectification of the audio signal. I have re-searched for it on youtube, but cannot find it now, I just want to see the schematic for it. Can you help? Have you heard of using two diodes? What's your opinion of using a variometer in crystal radio design? can it improve sensitivity for dxing?
@lectrikdog I have not heard of using 2 diodes. I can see where it might be possible, like feeding an amplifier or some circuit that can use both halves of the wave. I have a series of videos on variometers, but they were always less efficient than the designs in this video. Most variometer radios had a tube or tubes.
@@tsbrownie Id like to build a xtal radio that can allow for multiple stations to be heard simultaneously, as well as adjustable for high rejection of neighboring stations. In other words, something that in effect compresses or expands the radio band itself. Wondering how to go about it. have made xtal radios before ...hints appreciated thx❣
@@lectrikdog In the old days, they would have coils that could be changed out for those of different sizes / ranges. They were the capacitor type. If you really want to hear 2 ranges at the same time, just build 2 radios on the same board. Use changeable coils.
for the best radio sounds like the dual wiper would be it? not the dual capacitor? I think I would like to give the best a shot. not sure if I missed them but would you have videos of the build of either like the single wiper step by step you previously had published. keep the videos coming.
I like the dual wiper the best. I have a video on it. The link is in the description. It builds on the single wiper video (also in the description). The dual capacitor is good, but the sensitivity is less and it costs a lot more.
@@ShnitzlHaus I've got some improvements I'm working on. The more interesting ones should make it to a video. I don't make videos, I do stuff that I happen to video. ;)
In theory one could design a hybrid, but I have not done it or seen one. I have tried adding a cap to mine, but there's too much inductance to add any capacitance to. It drops the resonance too low.
@tsbrownie Perhaps I am unable to understand. The way you are reducing the inductance looks as if you are short circuiting the head phone input. Because when wiper will come on right side of the coil, that is the maximum inductance point, it will short circuit the headphones input. The simple way is connect one side of wiper with one end of coil and other end of wiper should slide on the coil.
@@sciencefollower Yes, if it was DC, it would be shorting the coil. But at AC it acts more like 2 coils. One coil is the antenna side, the other is the earphone side. You can make a radio that has individual 2 coils, one that's the antenna, one that's the earphone, but it's harder to find ways to easily tune.
"Hello, it's a pity that it is not possible to translate the subtitles in Polish" You might try copying the transcript from parts of the video you need and use google translate. Możesz spróbować skopiować transkrypcję fragmentów potrzebnego filmu i skorzystać z Tłumacza Google. And there's a summary at the end. You can screen copy and google translate. I na koniec podsumowanie. Możesz skopiować ekran i przetłumaczyć Google.
Wow, an excellent selection of comparison criteria! Exactly the information that is needed to choose a design. Thanks.
Thank you.
While I haven't seen any build information; the radio I currently want to know more about is from the same UA-camr that developed the credit card crystal radio.
His latest has a printed shell and uses a very basic form of tuning with a loop of wire revolving inside another loop of wire. He's a genius at making small, simple designs.
My first was a rocket radio purchased from a comic book ad in the 60's. I never did hear a peep out of it and threw it away.
Knowing what I do now I wish I still had it.
I got the parts now to try building a UA-cam radio called the almost solderless crystal radio. (I think that's the name) It uses a diode and cheap inductors that look kind of like resistors and ceramic disc capacitors for tuning.
It's a breadboard radio and if it works I'll probably solder it together on a piece of perf board and maybe make a small box for it.
Air Core Pipe Tip = I found a very simple way to improve a toilet paper roll to make a robust tube. You will need the first cardboard tube, cut to your desired length. You will also need another similar tube of a longer length - add say 2 inches/50mm. We will be strengthening the original tube, by adding additional cardboard layers inside this tube. This is a messy process. You will want to protect the outside surface of the first tube (the one that will receive the wire windings.) We will be using common liquid white paper glue. We do not want the glue to get on the outside of the main tube, because Mr. Brownie has taught us that any glue bumps will disrupt the wire windings. So, maybe cover it with removable blue painter's tape, or with plastic wrap. Here's the trick... Carefully cut the longer tube along its twisting diagonal seam. Coat the outside with liquid white glue. Twist the tube back together, overlapping the diagonal edges to reduce the diameter of the tube. Slide this assembly into the first tube. Untwist it, to expand it, to fill the inside of the first tube and attach it to the first tube's inner wall. Align the diagonal seam, to make the edges completely smooth. It will self-adjust, in its length. You will find the ends of inner tube that extend beyond the inside of the first tube are not aligned. This is no problem, so long as the diagonal seam is aligned for the full length of the first tube. Let the glue dry, overnight. Trim the inner ends to match the outer ends. Repeat, as you desire. The result is surprisingly strong and the effort is quite satisfying. Practice aligning the dry components, before applying the glue. I hope this helps someone. Ask questions, if the steps are not clear.
Thank you. BTW, the channel is named after my dog. ;)
Thank you so much for going through all this effort! Ive been trying to find a good crystal radio design and this makes it so much easier!
You're very welcome!
Fantastic. I built one as a kid....about 1948....cat whisker....bell wire out the window to a tree
@@kennethblackwell1137 Yep, they were, and are, a lot of fun. Magical.
Thanks again for your content. Great breakdown of various radio builds. The dual cap with the large coil is very nice looking. I've built two wiper radios since seeing your channel and now I want to experiment with design changes and aesthetics. I went for acrylic tube on my first two and a translucent-green resin printed base that contrasts really nicely with the reddish copper/varnish of the coil. I look forward to your next build.
Glad you like them!
Thanks for making the comparison for us.
My pleasure!
Could I use a shorter antenna being on the 15th floor of my building?
Maybe. I've never experimented with that. My highest is only a few stories.
What is the gauge of coil's wire and nos.of turns? Can i use old rotary telephone's ear piece(it has a metal diaphragmas a earphone?
The data for each radio is in the description under each individual radio video. The links are in this description. You can try the earpiece, but there are many types so I can't say for sure. It's worth a try.
i built a very basic one. only using that old telephone earpiece. fix station. no tuning. i used the crystal diode soldering it across the earpiece terminal. and one terminal connection goes to antenna n one to the ground. and the sound was audiable from the earpiece although low. And now i see so many types and improved one in UA-cam.
Thank you, very informative. :)
Glad you enjoyed it!
I am obliged for this video. Hopefully it helps those which ponder whether to construct a diode radio. Why are you trying to make a dimr
A while ago i ran across a crystal radio [on the internet, probably here on yt] that used not 1 but Two 1N34 germanium diodes for full rectification of the audio signal. I have re-searched for it on youtube, but cannot find it now, I just want to see the schematic for it. Can you help? Have you heard of using two diodes? What's your opinion of using a variometer in crystal radio design? can it improve sensitivity for dxing?
@lectrikdog I have not heard of using 2 diodes. I can see where it might be possible, like feeding an amplifier or some circuit that can use both halves of the wave. I have a series of videos on variometers, but they were always less efficient than the designs in this video. Most variometer radios had a tube or tubes.
@@tsbrownie Id like to build a xtal radio that can allow for multiple stations to be heard simultaneously, as well as adjustable for high rejection of neighboring stations. In other words, something that in effect compresses or expands the radio band itself. Wondering how to go about it. have made xtal radios before ...hints appreciated thx❣
@@lectrikdog In the old days, they would have coils that could be changed out for those of different sizes / ranges. They were the capacitor type. If you really want to hear 2 ranges at the same time, just build 2 radios on the same board. Use changeable coils.
What's the smallest circumference coil that you can make?
The "rocket radios" have a pencil size coil, but smaller is less efficient. Those only picked up the very strongest stations.
@@tsbrownie Thank you, sir!
Hello sir, if i explain how i'm building my radio could you let me know if it will work or not?
We can try, but I'm not sure it will work. Deal?
for the best radio sounds like the dual wiper would be it? not the dual capacitor? I think I would like to give the best a shot. not sure if I missed them but would you have videos of the build of either like the single wiper step by step you previously had published. keep the videos coming.
I like the dual wiper the best. I have a video on it. The link is in the description. It builds on the single wiper video (also in the description). The dual capacitor is good, but the sensitivity is less and it costs a lot more.
@@tsbrownie thanks! Will check the description. I will give the dual wiper a shot!!
Do you have more radios in the works?
@@ShnitzlHaus I've got some improvements I'm working on. The more interesting ones should make it to a video. I don't make videos, I do stuff that I happen to video. ;)
For a dual wiper, does the antenna tuner have to share the same coil?
Good question. In my version I have taps that allow me to connect the antenna coil to the tuner coil, but most of the time they are not.
What about a dual wiper and capacitor? Is that counterproductive?
In theory one could design a hybrid, but I have not done it or seen one. I have tried adding a cap to mine, but there's too much inductance to add any capacitance to. It drops the resonance too low.
WHAT IS THE FUNCTION OF WIPER ON THE COIL PLEASE ?
It changes the amount of inductance in the coil. More inductance = lower frequency.
@tsbrownie
Perhaps I am unable to understand. The way you are reducing the inductance looks as if you are short circuiting the head phone input. Because when wiper will come on right side of the coil, that is the maximum inductance point, it will short circuit the headphones input. The simple way is connect one side of wiper with one end of coil and other end of wiper should slide on the coil.
@@sciencefollower Yes, if it was DC, it would be shorting the coil. But at AC it acts more like 2 coils. One coil is the antenna side, the other is the earphone side. You can make a radio that has individual 2 coils, one that's the antenna, one that's the earphone, but it's harder to find ways to easily tune.
Witam,szkoda że nie ma możliwości tłumaczenia napisów po polsku 🇵🇱👎🏻🖐🏻
"Hello, it's a pity that it is not possible to translate the subtitles in Polish" You might try copying the transcript from parts of the video you need and use google translate.
Możesz spróbować skopiować transkrypcję fragmentów potrzebnego filmu i skorzystać z Tłumacza Google.
And there's a summary at the end. You can screen copy and google translate.
I na koniec podsumowanie. Możesz skopiować ekran i przetłumaczyć Google.
I am obliged for this video. Hopefully it helps those which ponder whether to construct a diode radio. Why are you trying to make a dimr