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Questions tagged [crystal-radio]

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1 vote
1 answer
108 views

trying to make a crystal radio, it doesn't work right

issue: trying to make a crystal radio, doesn't work right components: diode pulled from a working crystal radio set variable air-gap capacitor gang (VC), 125/250/250 pF in parallel, 40-625 pF total ...
Fyodor's user avatar
  • 31
2 votes
2 answers
168 views

Type of Ground Wire for an AM Crystal Radio - I'm using a longwire antenna

I have way too many choices for ground wire. I am using a crystal radio so I need the BEST not just what will 'get by'. I've seen solid copper 10gauge, aluminum wire etc. I've also seen wide ...
randy k's user avatar
  • 21
6 votes
2 answers
372 views

Why does capacitive loose coupling increase selectivity?

There are multiple ways to couple antennas. It is said that an antenna is capacitive loose coupled if a small capacitor is used between the antenna and the parallel resonant circuit (like C2 in the ...
dudekowsky's user avatar
1 vote
1 answer
398 views

What is an expected sensitivity of a crystal radio for 7 MHz band?

I'm learning to build radio receivers and transmitters. I've successfully build some oscillators, amplifiers and filters before and decided that to build a simple crystal radio would be a logical step ...
Aleksander Alekseev - R2AUK's user avatar
3 votes
1 answer
504 views

Multi-band Crystal Receiver?

I'm just getting into radio (inspired by YouTube videos), and like many, I plan to start by building a crystal set (or multiples) before moving up to vacuum tubes (which I prefer over transistors). ...
Zeiss Ikon's user avatar
  • 4,147
4 votes
2 answers
161 views

Can I create a functional crystal radio using a plastic coil filled with seawater as the inductor?

Pex is cheap and comes pre-coiled, 3/8" pex is 0.360" ID. 1/2" is 0.485" ID Fill with "sea water" using distilled water and sea salt to proper concentration. Use for AM and/or Shortwave coil. ...
Aerothorn's user avatar
3 votes
1 answer
2k views

Air Coil AM & Shortwave Crystal Radio Using 1/4" Copper Tubing

Looking to build a crystal radio, need help with the coil. I'm looking to get something to work with 1/4" thin wall copper tubing. Already have some nice diodes and whatever capacitors/resistors I ...
user13773's user avatar
3 votes
3 answers
596 views

How do I get my crystal radio to receive?

My 8 year old and I are trying to figure out how to get this crystal radio we made working. It's based off this youtube video. We get clicks when we put the crystal ear piece either side of the ...
Agent Zebra's user avatar
4 votes
1 answer
3k views

Building a crystal radio with my brother. How does this circuit work?

I'll be visiting home soon after school lets out, and I want to build an AM crystal radio with my little brother. This is the design we'll use: http://crystalradio.net/beginners/ I'll be doing my ...
BitPusher16's user avatar
3 votes
1 answer
139 views

feasibility of wireless passive crystal earphones

I just learnt about such a thing as a crystal radio receiver and the following idea came to my mind. I have no background knowledge on electronics nor anything related. What if battery-less earbuds ...
user2464424's user avatar