RELATED CRYSTAL RADIO VIDEOS: Best/Easiest DIY Crystal Radio - No Batteries, No External Power (4K) kzbin.info/www/bejne/nH25dKSQfNWpabc My New Favorite! Crystal Radio with Antenna Tuner: kzbin.info/www/bejne/o5mYfKt5pceEa7c Crystal Radio, Capacitive Tuning - WORKS GREAT!: kzbin.info/www/bejne/jHubYYGjbrCGoac Crystal Radio & Resonant Coil Design: kzbin.info/www/bejne/fKiclpVjlqdgjrc Crystal Radio Antenna (Shortwave Also): kzbin.info/www/bejne/fWmkpJqQl9OWjZY Good Crystal Radio Connection Points: kzbin.info/www/bejne/fWTUm6WImq2FZ80 Crystal Radio, Connect A DC Audio Amplifier: kzbin.info/www/bejne/iIiWh5ukr8ydqqM Three Upgrades For Your Crystal Radio: kzbin.info/www/bejne/gnaxlKJplM-JldU Crystal Radio Wiper Upgrade: kzbin.info/www/bejne/n2LSpXewaJ6hotk Popular Crystal Radio Design That's a Waste of Time - And Why: kzbin.info/www/bejne/qGqyn6iYZ72jsMU New Crystal Radio Design - "Modified-Pickard": kzbin.info/www/bejne/laLbeZt8gM9_d8k Crystal Electric Generator RF Energy Harvesting Exp 5 - Full Wave Rectifier: kzbin.info/www/bejne/eIXYkHqAgM-Co6M
@jaumemiralles20 күн бұрын
You saved my life. I'm not new on this, I made some crystal radios before, but this time I was getting mad wondering why it wasn't working at all. I made the coil rolling on a metal tube. It's not a wrong coil, but as you said, it was moving me out from the MW where the strong signals suitable for these radios are.
@simonkormendy849 Жыл бұрын
3:48 You can also use Litz Wire as a substitute for enamelled copper wire and it should work, Litz Wire is what they use to make the coils for Ferrite Rods that were used a lot in portable transistor radios from the 50's and 60's.
@Adrian_AdamViolonDiGerma-tm3nq8 ай бұрын
Can i use an 1n34a do-35? I mean this one is a Germanium Diode, written "1N34A DO-35". And if i made my own crystal earpiece (i sanded the metal plate until it lost 50% of thickness) with regular 35mm piezo element, would it works? Can you please tell me average voltage of the audio output of this crystal radio?
@tsbrownie8 ай бұрын
The do-35 is the package type, and that does not matter. BUT I did a quick search and many, many schottkey diodes are being sold under that label. They do not work well. I have a video on how to test for fakes. I have never tried that to make an earphone. Please let us know how well it works. The voltage depends on your antenna and ground, how powerful the radio station is, and how well the radio is made.
@craignehring5 жыл бұрын
It's been a long time since I've had a crystal radio to tinker with, I may need to build one again. Thanks for shedding some light on this
@tsbrownie5 жыл бұрын
I have a couple good designs. This is the one from the boy scout manual (slightly improved): kzbin.info/www/bejne/o6WQpGqmm5KIa7M
@MIKROWAVE15 жыл бұрын
Excellent advice and good listening! Some of mine have been pretty ugly, but fortunately no crystal set ever failed simply for being homely. P.S. Remember your ABC's - Radios fail because of Antennas, Batteries and Connections. And crystal sets have no battery so you are ahead already!
@TheGearhead2223 жыл бұрын
My father, who was a fantastic Chemical Engineer/former Machinist, helped me build a very nice nonworking xtal set back in the 1960's. Looking back, I now realize that not scraping the enamel off of the coil wire can affect performance!;) Those piezo earphones are notorious for not working, even if they are the correct ones. Of course, ANY open in the circuit will affect performance and one MUST have a good EARTH GROUND or the radio will not work. My dollars worth-John in Texas
@tsbrownie3 жыл бұрын
Do you still have the one you built? Or maybe you can rebuild it and make a video. If you do, leave a link here; I'd like to see it.
@TheGearhead2223 жыл бұрын
Good info on coil length also. When I made a tuned loop antenna, it was too long and shortened the reception bandwidth! I had to use a needle attached to one of the tune loop lead ends to short out the antenna until I reached (roughly) 16 kilocycles-John in Texas
@tsbrownie3 жыл бұрын
Good stuff, thanks!
@simonkormendy849 Жыл бұрын
2:28 Those crystal earphones are high impedance devices, because they are high impedance devices they don't load-down the circuit they're connected to, that's why they work, a crystal-set radio circuit is a high-impedance RF circuit that is, it operates at very low currents maybe a few micro-amps or so, most modern iPhone earphones and etc are low-impedance devices and need to be driven by a low-impedance circuit in order to operate correctly.
@beatlesadeye49126 ай бұрын
Can an old rotary telephone earpiece(that has a metal diaphragm coil ans a magnet)be used as a ear phone for audio sound of this crystal radio?..
@tsbrownie3 ай бұрын
I have heard they work, but I have never tried it.
@Davefinney3708 сағат бұрын
I just made this simple radio. My antenna is 22 awg stranded, about 100 feet. For a ground am connecting to the ground in an electrical recepticle. The radio has pretty good sensitivity, but really bad selectivity AND it works better WITHOUT the ground attached. What am I doing wrong? Oh, one more thing. Reception improves when I lightly place my hand on the coil over the wiper.
@tsbrownie8 сағат бұрын
There are several things that can go wrong. I made a video on the most common: kzbin.info/www/bejne/oXTbgmufhbaratU It is not unusual for it to work without a ground. I don't recommend using the ground in an electrical box. There's the obvious danger, then there are things like some grounds are not connected (I had several in my last 2 houses). And since it runs along with AC, there's noise. If there's one really strong station in the area (like my current house), then selectivity can become an issue. Here is a video on a selectivity upgrade: kzbin.info/www/bejne/boObfn2mr5aAr6c
@RayZ78344 жыл бұрын
On one of my crystal radios I built I added a rotary switch that selects from 4 different diodes to demonstrate the differences in how loud each different diode is. I intend on adding 2 more - a D311 and a D311A. My loudest crystal radio uses a Russian D311 diode. Also installing a simple coil between the antenna and my crystal radio also increases volume. Unfortunately I can only pick up either one station at 1590 or that one and another one simultaneously
@tsbrownie4 жыл бұрын
That's an interesting experiment. You should post a video on it. Leave the link here. I'd like to watch it!
@RayZ78344 жыл бұрын
@@tsbrownie I might try that. I posted some music I played under my name Ray Zaballa ( not so great ) I will try to do as you suggested.
@RayZ78344 жыл бұрын
I can no longer post videos from my phone to KZbin . I used to be able to do that and then some changes happened and it's now no longer available. I will try to link up to them
@joebidet13302 жыл бұрын
Ive tried numerous and found the d311 the best too vf is just .150 very low
@arthur_stve3 ай бұрын
5:03 So that means i can replace it with a variable capacitors? So i don't have to use the resistor?, my big confusion is can i add a variable capacitor to that single wiper Crystal Radio?
@tsbrownie3 ай бұрын
If you use a old style earphone from before 1960s, you use a capacitor. If you use a newer one it has to be a resistor. If you use the wrong component, you will get a very low volume sound.
@beatlesadeye49126 ай бұрын
Can an old rotary telephone earpiece(that has a metal diaphragm coil ans a magnet)be used as a ear phone for audio sound of this crystal radio?
@barrykelly27225 жыл бұрын
Excellent suggestion. This is a huge help. Now to rebuild the radio so I can place it in the machine I built that allows me to travel through time....I call it my...." " " time....machine " " "
@bobhs16059 ай бұрын
I’m curious, you mentioned how using bare copper would essentially be like using a copper tube. Once you sand a strip for the wiper, how is that not also a solid connection?
@tsbrownie9 ай бұрын
There is still insulation between the each wire. Only the top of the wire is bare.
@southernexposure123 Жыл бұрын
Thank you. I've made crystal sets in the past and they worked OK just not loud like yours even with my radio station running a kW and just 4 air mikes away. At oue point way back then I bought one already put together. It was OK, just not really loud. Recently it took me 2 weeks to get a crystal oscillator to work on 7 mHz. I'm learning to never take anything for granted. Lately just about everything that can go wrong does go wrong. lol I now have transistor testers, LCR testers set. Maybe I need some tester testers. Thanks for the tips.
@tsbrownie Жыл бұрын
Good on ya! Oscillators can be tricky, and higher frequency makes it exponentially so. I made my first one by accident by feeding the output of an op amp, through an old TV coil, back into the input. After that I was hooked on resonance. Coils are important. I know I keep advertising myself, but here's a video on some coil sizes/wire sizes where I've already run the calculations and in the case of 19 AWG, already made several radios. kzbin.info/www/bejne/m5urnGiqe8p-fs0 It's worth the hour+ and cramped hands it can take to beautifully hand wind one. Oh, BTW, I have another video on adding an amplifier to a crystal radio, if you do want them louder. Personally I'm a purist and don't mix power with my crystal radios! ;)
@southernexposure123 Жыл бұрын
@@tsbrownie lol I'm already watching some of your other videos. 😁 So your self promotion is a good thing and helpful. When I get my diode going I'll make the one with the L match. 30 years ago I was heavily into making home brew projects. I read after Doug DeMaw and Wes Hayward and made a DC (direct conversion) receiver for listening to morse code. I made a contact in Canada and a few more with the VFO only. It measured 140mW on an oscilloscope. I didn't realize how much anyone can forget when they get out of practice. I'll keep on piddling and I'll get there with perserverence and your tips. I watched your video on bad crystal radio designs and it hit me like a slecge hammer. Almost every one I made used the variable capacitor. I'll wind the coils like you suggest and can leave out that cap. Good on resonance and crampped hands. I'm thinking about making a jig so I can use a variable speed drill to turn the PVC pipe for wingind coils. I suspect the jig can't be harder to make than the piece you made to mount the variable capacitors on the 1979 radio.
@tsbrownie Жыл бұрын
@@southernexposure123 Wow, I'm impressed with your DXing! I hear you on forgetting. I had to relearn a bunch of stuff before I made my first video. (I actually reviewed the original boy scout handbook I made my first one from!) I'm putting together a winding jig and a video (of course). It's just 2 wood cones (I've seen them online for about $1) with a threaded rod through it. You can mount it in a cardboard box of the right size. Cranks are good, but you can just turn the core by hand. I won't use a drill, because it's easy to kink/bend the wire, and tightly spaced turns are not just beautiful, they make for a better radio. I'm also going to start experimenting with "natural" diode replacements like galena, etc. The 1n34a is starting to get hard to find, then there's the fake factor. Let me know if there's anything I can help with.
@southernexposure123 Жыл бұрын
@@tsbrownie I didn't know winding jigs were already offered so cheap. The reason I thought of a variable speed drill was so I could run it slowly at a set speed and control OFF / ON with a toe or a knee. A few years ago I used a battery fpowdered drill and set the speed just about like rock polisher to make black powder. I made it only once. It's too scary and easy to get an explosion. I set my ball mill outside a few hundred feet from my house. Then I hesitantly approached it for stopping the mill. I likely wouldn't have thought about wood for cores, although I have seen some coild wound on forms that weren't round. I don't think I have the patience to try setting up a galena. Oh earlier tonight I saw a video show and tell how to detect whether the 1N34A is real or fake. Under that video was a comment telling how Skotchky diodes have some sort of benefit over the 1N34A. I think it was something to do with better selectivity. I was going to reference that specific vileo with a link, but a seatch yielded that there's more than one video on that subject: kzbin.info?search_query=how+to+tell+if+a+1N34A+is+real+or+fake The one I watched was made by a fellow with a heavy accent, maybe indian. I appeaciate all the chat and tips. My next undertaking will see how big the wire is inside a microwave transformer. I suspect it might be too small for our purpose. Have a good night and I definitely will get in touch with any more mysteries or discoveries. Thank you.
@southernexposure123 Жыл бұрын
I've reserched microwave ovens for wire. I knew people were saying you could get killed by the high voltage. I thought I knew how to avoid that. But my research online tells me there's more stuff inside those ovens that can cause severe health issues if it's breathed into your lungs. I think I'll just buy my wire for coils...
@Slowly_Going_Mad4 жыл бұрын
I have an interesting problem. I'm using a 1N914 diode, a 120' long steel electric fence wire for antenna, and a regular earpiece. Every thing works except I only get the Spanish church channel on 1140 AM. I have tried nearly every configuration of tuning possible and it just stays at that band. Thank you and nice videos on these nifty old radio receivers.
@tsbrownie4 жыл бұрын
The antenna and low sensitivity diode will "work" but will only the the strongest signal(s).
@Slowly_Going_Mad4 жыл бұрын
Thank you for the good input. The antenna on its own is capable of lighting LEDs six in series. Guess I need to find a better diode.
@waltschoenly33265 жыл бұрын
Can you use copper, multi-strand wire -or- is solid necessary for your antenna?
@tsbrownie5 жыл бұрын
Most that I've seen / used are just single strand wire. It's almost always bare wire, so multi-strand would hold water longer and corrode faster. In theory, multi-strand may also deliver a less sharp signal if the different strands receive / send signals at even slightly different speeds / distances.
@waltschoenly33265 жыл бұрын
@@tsbrownie Okay, thanks for responding. :-)
@Colaris992 жыл бұрын
Does the diameter of the plastic tube you coil the copper wire around matter as the tube I have is about half of yours?
@tsbrownie2 жыл бұрын
Yes, it matters a lot. Changing any of the dimensions changes the frequency range of the radio. If you get outside the AM band, the radio will work badly or not at all.
@lomgshorts34 жыл бұрын
Either use all brass or all stainless or solder your connections. Mixing two dissimilar metals causes a galvanic action that will corrode your connections. Never use a combination of aluminum screws and brass/copper washers as they react the strongest with each other. This goes for any radio you may construct. I have a question: can you use a 4 pin tube base to wind coils on so you can change bandwidths? Thank you.
@tsbrownie4 жыл бұрын
Yes, older radios used to use changeable coils or tapped coils to reach different parts of the band they wanted to receive. But back then all bands were AM, so one could do that. Today many bands are FM or other and this radio won't work for those.
@brianmorris80452 жыл бұрын
I have trouble getting 1N34's here down under. I have to try get them from eBay.
@qwertykeyboard59015 ай бұрын
1:10 Eh.... I'm currently using a germanium transistor wired as a diode. It's working fairly well.
@tsbrownie5 ай бұрын
They "work", but a much quieter. You lose faint stations. Try comparing it to a D9K or 1N34A, the difference is significant.
@qwertykeyboard59015 ай бұрын
@@tsbrownie Yes, but I don't have a proper diode. Would like one though...
@qwertykeyboard59015 ай бұрын
@@tsbrownie I get a forward voltage drop of about 200mV, and with the questionable antenna I have I can receive the two most powerful stations with good volume. You could definitely do worse!
@qwertykeyboard59015 ай бұрын
@@tsbrownie So as it turns out, I DO have germanium diodes! 1N60's to be precise. (Thought they where silicon or something, datasheet says schottky, and the MTester says Vf=~720mV) Yeah, the actual diode is better. But I will say, the germanium transistor thing isn't that far behind.
@tsbrownie5 ай бұрын
@@qwertykeyboard5901 OK, is it working better? I have heard about the germanium transistor and will have to compare against a 1n34a or d9k.
@RayZ78344 жыл бұрын
I really like your videos and I'm very thankful for all the information you provide.
@tsbrownie4 жыл бұрын
Thank you. I'm glad you find them useful.
@alexismas52653 жыл бұрын
On the right side of the radio, was the wire, earphone, and resistor between the 2 brass washers or under the 2 (between the 2 washers and the wooden base?
@tsbrownie3 жыл бұрын
In between 2 washers is best. If you have only 1 washer, put the wire between the wood and washer.
@alexismas52653 жыл бұрын
@@tsbrownie Thank you for the help
@adnacraigo65903 жыл бұрын
Your videos are easy to follow and are very informative. Thanks.
@tsbrownie3 жыл бұрын
Glad you like them!
@Magnetic5814 ай бұрын
Really appreciate your information thumbs up
@mohammadalfauomey34435 жыл бұрын
Nice Why did you use a resistor connected to the coil , & what is its value? Thanks
@tsbrownie5 жыл бұрын
The specifications of all the parts are in the description. The resistor is to dissipate charge on the piezoelectric earpiece.
@tsbrownie5 жыл бұрын
@Kirk Rundstrom Science is all about observation. Sounds like you were a natural born scientist!
@beatlesadeye49126 ай бұрын
What's the guage of the coil's wire guage?
@tsbrownie6 ай бұрын
All of my videos on different radios have the specifications in the descriptions.
@beatlesadeye49126 ай бұрын
@@tsbrownie yes I see now lately.
@Mr.PauloSica2 жыл бұрын
Thank you so much for the tips!🙏 Could you make a version of this crystal radio with a speaker and a battery? It would be amazing to have this device playing without the earphones...
@tsbrownie2 жыл бұрын
I have a video like that. I show how to connect this to a speaker and amplifier.
@gordthor53513 жыл бұрын
I long time ago I made a crystal radio very similar to yours without any resistor and the signal came in crystal clear (no pun intended). Even when hooked up to a 30 watt amplifier. Now I can't get nothing but a little static sound. At the time we had a local AM station, but I could also get a few other stations (al be it not as clear). I can still get a few not so clear stations on a cheap junk clock radio which was never very clear. I expected some oxidation after 20 years of sitting and I cleaned up the connections and checked for continuity, but I can get it to work. Maybe the signal is too weak, but I should be at able to hear something. I'm using the same diode as you are. Is antenna length super critical, because who knows if I cut off a piece of the antenna over the years for another project. My antenna is about 15 feet long. I used a 3/4 " plastic tube with very fine enameled wire with excellent results.
@tsbrownie3 жыл бұрын
I have a video on when things go wrong: kzbin.info/www/bejne/oXTbgmufhbaratU You say you don't have the resistor, which is OK if you are using a 1950's type crystal earphone, BUT, if you are using the newer piezoelectric earphones then without the resistor you will just hear static and popping. AND, with the newer style earphone, you absolutely don't want to add the old capacitor they used to use.
@gordthor53513 жыл бұрын
@@tsbrownie Thank you very much for that info. I must have a crystal earphone. I think the diode I have is old school too, because it looks more like a resistor with black, brown and red bands, instead of the modern glass type.
@tsbrownie3 жыл бұрын
@@gordthor5351 Give it a try and let me know.
@davidanderson4986 ай бұрын
I once tried an LED, and it gave me the best signal of all the diodes I tried. It was one certain LED, I'll do some experimenting, maybe try a blown LED.
@bobhs16059 ай бұрын
If you ever run out of ideas for more crystal radio videos (I doubt that’s possible), can you do a video showing us soldering shorter lengths of copper wire to make the coil-and how to minimize the problems involved with disrupting a perfect coil?
@tsbrownie9 ай бұрын
I just did that, but did not make a video. I drill a hole in the tube. I push both ends of the bared wire into the hole. Then I twist the 2 ends of the wire together inside the tube (it's a bit tricky) and solder it.
@marynollaig41243 жыл бұрын
What is the optimum diameter fo the coil tube?
@tsbrownie3 жыл бұрын
The details are in the description under each different radio video. Rules: 1) The system has to resonant in the range of the AM radio band. 2) Generally speaking a larger tube has a higher Q (more efficient) to a point. (See rule 1). 3) I have a video on the factors involved in the coil. This is important. Guessing won't work.
@alial-fj6ob3 жыл бұрын
My brother How many the coil turn Thanks
@tsbrownie3 жыл бұрын
I put all the information in the description for you.
@Adam-qd8jh4 жыл бұрын
My crystal radio only works when I have my hand on my variable capacitor or on the coil. When I remove my hands it stops. I know I’m picking up a station because I can hear music. But when removing my fingers it just stops. any solutions to this ? And also a few bits of info, I’m using a plug in usb speaker then attaching my heads to the speaker jack.
@tsbrownie4 жыл бұрын
The signal on mine often increases when I put my hand near the coil. That is normal. It sounds like the station you are getting is very faint. I can only guess, but I think your USB speaker requires too much power and is interfering with the radio circuit. It is BEST to use a crystal earphone. Next choice is to use a battery powered amp connected via a small cap in serial. 3rd option, try putting a small capacitor in between your USB speaker (in serial) to cut down on the power draw. That **might** help. Let me know if that helps.
@Adam-qd8jh4 жыл бұрын
@@tsbrownie alright thank you, I’ll let you know how it goes later. I ordered a crystal earpiece a few days ago and it should actually be arriving today or tomorrow. I also might try to move the radio around, my house is very electrically loud and might be causing interference.
@Adam-qd8jh4 жыл бұрын
@@tsbrownie still no luck, I ended up adding a 0.1 UF capacitor and a 43k resistor onto the radio. The good news is that I hear a light buzzing coming through the speakers “Which is very faint”. And I don’t even have to have my hands on any of the metal now. The bad news is I can’t hear any radio channels. I think my last options are to wait for my High Impedance ear phones to arrive. And also increase the intenta now that I have added those components on.
@tsbrownie4 жыл бұрын
@@Adam-qd8jh if you can take a video and post it, put the link here and I can take a look. You might also watch my video on antennas. How far is the nearest AM station from you?
@Adam-qd8jh4 жыл бұрын
@@tsbrownie I have a few radio towers that broadcast AM around me. One is 6.4 miles away from me, and the other one is about 7 miles away. There are more but they are in the range of about 14/24+ miles away.I was actually going to make a 75+ foot antenna as the one I have now is a measly 10 to 15 foot antenna. I will upload and send the video link within a few hours.
@joel62212 жыл бұрын
Why would paint affect the coil's performance?
@tsbrownie2 жыл бұрын
Any paint that contains pigments is a problem. Pigments are chemicals that contain metals. Metals react with the electromagnetic field of the coil. Colored paints would be similar to covering the coil/tube with aluminum foil. Clear acrylic spray paint is not a problem.
@joel62212 жыл бұрын
@@tsbrownie THANKS SO MUCH, could be a problem on one of my recent builds. It's a pretty build, just isn't working. :)
@tsbrownie2 жыл бұрын
@Joel Ohmer If you post a video of it leave a link. I'd like to see it. Also, I have a video on common reasons they don't work.
@grs62625 жыл бұрын
a good ground is of most importance--it is the return or completion of the antenna circuit--i once had a poor ground and it worked sort of--when i replaced my poor ground with a good 8' ground rod the difference was day and night--
@grs62625 жыл бұрын
sorry--the strike through seems to always happen on utube--not sure why--
@tsbrownie5 жыл бұрын
I did a search on youtube and strike through and they said it's the use of hyphens that does it. Let's try. hyphen -this is a test- hyphen. And it works. The hyphen has to have no space between the character and itself.
@grs62625 жыл бұрын
@@tsbrownie --thank you sir.. i will try to avoid the hyphen from here on..my old english teacher would be upset with me if she knew i was doing that anyway..
@grs62625 жыл бұрын
it worked.. thanks again..
@SpaceCatty-i2l4 жыл бұрын
I’m in Europe here is fm stations, that will not work here ?
@tsbrownie4 жыл бұрын
No, it will not work with FM. AM only.
@SpaceCatty-i2l4 жыл бұрын
@@tsbrownie thank you for the fast reply :)
@daisydaysbotanicals12913 жыл бұрын
Would a old telephone handset work
@tsbrownie3 жыл бұрын
Good question. The really old ones were crystal type, and they will work. It's worth a try, and it it does not work you go with the crystal one.
@beatlesadeye49126 ай бұрын
And how to connect a metal gang for tuning?
@tsbrownie6 ай бұрын
I don't understand the question. Do you mean a variable capacitor? This type does not use a capacitor.
@beatlesadeye49126 ай бұрын
Yes. I mean dielectric metal gang condenser.
@MiiMaker4 жыл бұрын
do you need an electricity for this?
@tsbrownie4 жыл бұрын
No, the power comes from the signal itself.
@MiiMaker4 жыл бұрын
@@tsbrownie :O awesome! But is it possible to tune into 108 MHz FM with this?
@tsbrownie4 жыл бұрын
@@MiiMaker FM works very differently and requires much more complex decoding.
@YusupYusup-ez8qn6 ай бұрын
I make it work but it have to use mini ampli..if not no sound.
@tsbrownie6 ай бұрын
Something is wrong. If the station is within 15 kms, you should hear it clearly with just the earphone. Here is a video on common problems: kzbin.info/www/bejne/oXTbgmufhbaratU
@richardsmith7783 Жыл бұрын
Hello my friend? what size capacitor, is the one in this video?
@tsbrownie Жыл бұрын
Only 1 of my crystal radios uses a capacitor (and it uses 2). kzbin.info/www/bejne/jHubYYGjbrCGoac Crystal radios from when I was a kid 60 years ago had a small capacitor, BUT they used a different type of crystal earphone. The new crystal earphones are piezoelectric (with built in capacitance), and if you add a capacitor instead of a resistor you will get static.
@richardsmith7783 Жыл бұрын
@@tsbrownie Thank you so much for your reply back, lol lol I'm going to let my grand kids make one Like i made 60 years ago lol lol
@tsbrownie Жыл бұрын
@@richardsmith7783 Very cool! It's a bit of magic shared between generations. Have fun!
@sgit12 жыл бұрын
Great information _ thank you.
@yusup31993 жыл бұрын
Hard to proove the diode is correct. Thats my big problem hard to find this diode and trusty saler.
@huckfin86665 жыл бұрын
Yep, i built this one myself and i ant get that thing to work, I made a tesla coil for wireless got that to work but this radio, not so much !
@tsbrownie5 жыл бұрын
If you have an AM station within 30 miles, it should work. Give it a check again and compare it against this video to see why it's not working.
@huckfin86665 жыл бұрын
@@tsbrownie will do, I'm going to try one more time and i will also try with a varible tuning block i had from old radio, but not sure what side is am !, but thanks
@davidj.lebaron7094 жыл бұрын
You did not ever give the value of the resistor!!!
@tsbrownie4 жыл бұрын
A 10k is usually good. The specs are in description of the actual radio builds.
@davidj.lebaron7094 жыл бұрын
@@tsbrownie Wasn't sure where to find it. I plan to use a ferrite rod antenna, with VTC ( 365 pF ) as I need to be mobile. Thank you very much!!!
@tsbrownie4 жыл бұрын
@@davidj.lebaron709 That's interesting. Please post a video when you are done. I'd like to see it.
@davidj.lebaron7094 жыл бұрын
@@tsbrownie Thank you, will do!!!
@smug85673 жыл бұрын
When ours don't work, Pa just spits in the back of it and whomps it.