Introduction To Crystal Radio Receivers
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- Опубликовано: 2 авг 2024
- Introduction To Crystal Radio Receivers
Crystal Set, Diode, Capacitor, Crystal Radio Receiver, Antenna, Germanium, Inductor, Build, Tuned Circuit
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Gear I use:
Multimeter: OWON B33+ amzn.to/3UkTJOo
Oscilloscope: KIPRIM DS1202 amzn.to/3gfJGMN
Signal generator: Junctek JDS8080 shorturl.at/ehTZ1
Component Tester: T7 Multifunction amzn.to/3AYY03v
Soldering Station: Sealody ??????? 
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Blast from my long back past, Ahh the memories. the start of my fascination with electronics in the 60's, Thank you
A kit just like this one was what got me into electronics when I was 6 years old. I strung the antenna out of my first-floor window to a tree in the backyard, about 5 feet in the air above the back gate. Nearly strangled my 6-foot-tall father when he came home that night!
Another great kit, and the one that confirmed me as an "electronics addict for life" was the "50 in 1" electronics kit that I received on my 7th birthday, with some components mounted on a board similar to what you show here and the same "spring" connections. I built far more than 50 projects with it and eventually repurposed the box a few years later when I built my first record player.
Great video Paul!
My first (and best) was built off the design from the old radio shack books by Forest Mims. I used a thread spool for the coil, the antenna was about very long and went along the back field behind my home. I picked up signals from all over the world. Now my nephew is interested in making one. His dad has ordered the parts and we will be building it in a few weeks. Thank you for taking us back down memory lane!!
That is such an awesome way to introduce a child to the world of electronics. Congrats to you guys for doing that
Brings back old memories. Excellent video, nice kit.
Very cool. I loved those old Science Fair Kits. I had the 150-in-1 set when I was a kid.
Thanks Paul! My first crystal radio was a little rocket, with a pull out rod in the nose to tune it.
Later years my best friend used to get the Tandy kits with springs, and we built and tweaked all kinds of circuits.
Found your channel a while ago, looking for 'how to restore my soldiering iron tip' and have been enjoying your videos ever since.
I built a few crystal radios when I was a child. It was my first experience in electronics and it has been a joy to find that the device you built work well. One of this radios was staying near my bed so I was able to listen a local music station before falling asleep.
Thank you very much for this nostalgic video!
Brings back Memories of a long time ago I was out Camping with uncle and friends listened to Crystal am with a slide to Change channel & earphone
I also built one of these back as a teenager, it picked up so much and amazed me that it didn’t need a battery. I also discovered it picked up the signal from our cordless home phone and I could happily listen to any phone call and could hear both sides of the conversation - some unpleasant things were heard. Still, I could also pick up far away stations during the early hours. Mine was earthed via the mains water and a 25m length of 0.25mm singles made the aerial slung out the window and attached to a tree at the bottom of the garden
I had that exact same Tandy crystal set back in the 80's. I think I was about 7 or 8 when I got mine and it turned into a life long interest in electronics.
Thanks for another interesting video. You must have grown up about the same time I did: I used to build lots of those Radio Shack kits. I wonder if back then, "Made in China" meant Taiwan?
The pure simplicity of crystal radios has always fascinated me. It's always seemed like magic that you can demodulate an AM signal with just a diode. And also that there's enough power in radio waves to drive an earphone. I've often wanted to try to make an actual cat whisker radio, using a wire and galena crystal. I hadn't thought about it before, but I guess that would be equivalent to a Schottky diode, as you suggested.
But I definitely never knew that a rusty razor blade is a semiconductor. I learn something every day. Take care. 🤓
Thanks for the memories. My dad bought me the radio shack 150 in one project kit, back when I was about 10. That began my love of electronics. Built a foxhole radio and that was pretty cool. Besides the safety aspect, keep your antennas away from power lines because of interference and induction. One does not want 7.2/7.5 KV smoking radio gear.
I had a crystal radio kit when I was about 11. About 53 years ago. Mine wasn't as fancy as the 2 you had.
My 1st Crystal radio had a real quartz crystal and "cat's whisker". Then I learned that an 100' antennae wire would capture about 1.5v of RF power! Very good video!
This made me smile ! Back in the age of dinosaurs ,when I was a kid , another kid I knew I came about on the street ,and he had one of these things hooked up to a fence . I asked if I could have a go and he said yes ,then promptly scarpered : ( Anyway years later I saw a 'Ladybird' book about this very subject on ebay ! Why it makes me smile is that I never yet have made a set ,but it set me on a hobby in electronics where I have completed lots of quite complex projects and own a lot of equipment . Goes to prove ' From little acorns ' !!! Thanks for making another great video 🙂🥃
You owe it to yourself to build a crystal set. Every time I hook it up I'm just awed that it sucks signals out of air with no power. I know how it works but I'm like a child every time!
@@learnelectronics Thankyou for answering so quick : ) I will get moving on this ,I will make one with my grandsons . Thanks for the spur !🍕🍺
I have always loved these silly little things!
Love your style of presentation. Addicted to these videos.
This crystal radio started my journey. I totally forgot about it until I saw this video. I’d love to get one for my son. Thank you for explaining the mysterious device I played with as a kid.
I remember finding a book in my local library which started with the basic crystal radio all the way up to a hetodyne receiver. It was enough for me to work through to the ARRL book and learning about IF strips electronics in general. This was all in primary school so it set me up for a lifetime. All thanks to the humble crystal radio.😊
Hot damn, I had one of those Radio Shack crystal radios too. Sad to say I don't have it. It was still at the old home place that burnt down last November, sister got out ok. I do remember having some other kind too but don't know which one. I was going through some junk box's the other day and found 2 crystal ear piece's and I thought that's weird... Lol Now a video! 🤔
Good Stuff...
LLAP 🖖
Thank you for doing this video! I remember my dad gave me a crystal radio (believe this exact one, i recognize the ear piece) and as a young kid really amazed me how I would get radio with no power source. Remember listening to this at night in bed probably when i was 7 or 8. Blast from the past! Thanks Paul.
Paul, As many have said, Radio Shack provided the start for my interest in the physics of electronics and electromechanical systems and more than 40 years in communications in my military and civilian careers. The toilet paper tube crystal radio was a big step in my understanding of the electromagnetic transfer of data through the ether. I like that we have a push for STEM/STEAM in our schools, but we need the hands on of vocational schools providing training in the teen years so that we can promote all of the trades. (I had three years of Vocational electronics in High School.) We need to build our Guilds back up, because everyone does not need a degree in basket weaving, but we do need someone with the proper tools and knowledge to fix our plumbing, HVAC, Electrical Systems, etc.. Thank you for providing one of those channels that might spark someone's interest enough to want to learn and make electronics, and maybe take it to the next level, a career.
That's a really nice old kit. Many thanks for showing us, Paul.
I had the crystal radio with the large tuning coil that one would wind on a form. I could pick up the local AM stations. I eventually graduated to the Sinclair Micromatic miniature AM radio. But, that's another story.
☮️ brother.
Local oscillators actually produce carriers, that’s how they were detectable. Tune in a local AM radio station on a modern radio and you will hear a blank carrier at 455 KHz above the station’s frequency on another radio that’s close by. The same thing happens with FM radios, except the carrier shows up at 10.7 MHz up. They can actually be modulated as well by introducing audio and the RF signals can also be amplified.
I've used the copper pipe for ground before but on modern houses that doesn't work as modern houses now have plastic pipes
Awesome, learnt alot
Fantastic 🥰👍
I remember making one with my son when he was like 5 or 6. We had to sit in the bathroom to get to a good ground.
Speaking of RadioShack stuff, I also had that 200-in-One electronics kit back in the day. You could build a crystal radio with that one, too. There's nothing like that spring-in-cardboard technology. As frustrating as it could be at times, I actually liked it.
I also found my old RadioShack frequency counter a couple of weeks ago. Would you believe it still works even though I was young and stupid enough to leave the batteries in it all those years? That's solid construction you don't see anymore right there.
I had the exact same set. I say around the late 70s.
By changing the coil you can get shortwave stations assuming you can actually find one that still running. Try a ZN414 with a AA battery for more POWER !🙂
Mine was an old stereo i was told to fix cause I was always messing with everything electronic at 7 years old
You might be interested in two books by H.Peter Friedrichs: "The Voice of the Crystal" and "Instruments of Amplification" He shows you how to build a crystal radio ENTIRELY from scratch (even the earphones!) And how to make your own transistors and even vacuum tubes. THE definitive book on Foxhole radios is: "Foxhole Radio" by Brian Carusella. 73 DE W8LV BILL
The band on the cover of the box looks very much like "The Jam" who were a British "punk/new wave/mod" group that hit the music scene some time around 1976 to 1977 - even the guitar designs seem identical. Someone has just "traced over a photo" to get that box art!
So that definitely ages the box cover as The Jam broke up in 1982.
The date on the box is 1980
@@learnelectronics That's probably about right then.
What were the coil and cap measurements? Did I miss that?
Also, if one wanted a speaker could you hook the crystal circuit up to something like LM386 or an op amp with output transistors to drive a speaker?
Could you follow up on external antennas. I am thinking for the cheap portable sw-mw-lw radios. There are so many options. 3.5mm input jacks, clip on the extension antenna, some loop that just sits next to the radio... How do we optimise an antenna for a certain sw frequency?
Thank you...the crystal radio video was great.
You want a single piece of wire that is a multiple of the wavelength. So if your wavelength is 100 ft, you would want an antenna that is 100 ft or 10 ft or 1 ft. If your wavelength is 500 ft, you want an antenna that is 500 ft, 50 ft, or 5 ft.
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Omg I had one of them six million dollar man kits.. wow.
That makes you the only other person to have ever told me they owned one.
I'm playing with FM radio. i made a transmitter from a kit. It's a 5W output but it doesn't go very far. 2 city lots it's mostly static. If there is anything in the way no signal. Short of boosting the wattage what's the best way to get it to transmit over a larger area? Higher bigger antenna? Type of broadcasting antenna? I'm just trying to play streaming stations over my property. I need a strong short range signal. I'm not interested in broadcasting to the whole community yet. We have one radio station on the dial.
If your transmitter is indeed 5 watts and it’s connected to an antenna, then the range should be a few miles rather than two blocks.
I had a crystal rocket radio
Be cautious about using cold water lines for ground. Many (or maybe most) homes now are plumbed with PVC lines. Plastic does NOT make a good ground!!
AM will soon be removed from radios.
so build a home transmitter kg6mn