Skip to main content

Questions tagged [crystal-set]

A crystal set is a very basic AM receiver that can be used without batteries.

Filter by
Sorted by
Tagged with
1 vote
1 answer
64 views

Crystal radio antenna question

I am trying to make crystal radio. I have almost everything I need (magnet wire, high impedance headphones, germanium diode.) The only thing I am missing is the antenna. I know that if I want to ...
LaCalienta's user avatar
-1 votes
1 answer
141 views

Is this circuit for attaching an amplifier to crystal radio going to work? [closed]

This is a circuit I created and I was wondering if its going to work, by the way I am new to electronics so if you see any obvious mistakes please let me know.
Mr.Ananas's user avatar
2 votes
1 answer
250 views

Would this crystal radio circuit work?

Would this crystal radio circuit, that I came across, work? If it would not work, I would like to know which part of the circuit could be the likely cause and why. The speaker shown is actually a ...
Mr.Ananas's user avatar
3 votes
2 answers
339 views

Crystal Radio Troubleshooting

I am learning radio starting with the basics, and I had a question about the behavior of my set up. I made a crude schematic below, the antenna is a 14 AWG random wire that I hung from a tree (using ...
user284206's user avatar
0 votes
1 answer
127 views

Is this radio receiver/transmitter plausible?

Previously I have created a simple radio receiver using the schematic below (based off a crystal radio), and I was wondering if the modified circuit which is also below would work for a simple morse-...
Luke Campbell's user avatar
0 votes
1 answer
186 views

Using the earth pin on a power outlet as the earth for a crystal radio

Would there be a way to safely use the earth pin from a power outlet as the earth connection for a crystal radio?
kene02's user avatar
  • 538
-1 votes
2 answers
423 views

Alternatives to a monopole antenna for a crystal set

In my last post, @Andy aka recommended that I use a 100 ft (30 m) tall monopole antenna for my crystal set (see diagram below; it has a frequency band of 890 - 1453 kHz). However, I don't have the ...
kene02's user avatar
  • 538
0 votes
2 answers
202 views

Touching the antenna of a crystal set

I built the crystal set shown in the diagram below and I find that the signal it receives is clearer when I touch an uninsulated part of the aerial (i.e. the node labelled "green" on the ...
kene02's user avatar
  • 538
1 vote
3 answers
195 views

Crystal radio receiver

Why is a parallel LC circuit used to filter out the right frequency from the antenna? Shouldn't it be in series? We have a maximum impedance at resonant frequency if we connect in parallel, so why isn'...
William Carlstedt's user avatar
1 vote
1 answer
1k views

Why do so many crystal radios have big coils?

I've been looking at crystal radios recently, and I noticed that many of them had quite big coils (maybe around 5cm on average from what I can see), but wouldn't they want quite a low value inductor ...
Luke Campbell's user avatar
1 vote
3 answers
373 views

How does a crystal radio headset act as a lowpass filter to remove the carrier wave.?

I saw a similar question " How can a diode act as a detector in a crystal receiver" but one of the comments said "after the diode splits the wave form to the top half ...the carrier must still be ...
Sedumjoy's user avatar
  • 729
1 vote
3 answers
390 views

Crystal oscillator application

(Note: I am aware that crystal and oscillators are two different things but a lot of people use them interchangeably so I am using it in the title.) My question is about oscillators, all oscillator ...
Curious KP's user avatar
20 votes
4 answers
7k views

What does the rectifier do in a crystal radio?

I have been reading up on semiconductors and all of the references that I have found say that the first practical application of the semiconductor diode was in crystal radios, and that semiconductor-...
vy32's user avatar
  • 451
4 votes
1 answer
1k views

How can a foxhole radio tune in on a frequency without a capacitor?

A primitive foxhole radio only consists of an antenna, coil, diode and headphones. There doesn't seem to be an LC-resonator, so how does this radio tune in on a carrier frequency?
Axel Boldt's user avatar
5 votes
7 answers
3k views

Can unpowered radio work without ground connection?

One feature of the Crystal radio is that it needs no other power source but that received solely from the power of radio waves received by a wire antenna. But it also requires good ground connection ...
SF.'s user avatar
  • 1,212
2 votes
4 answers
4k views

Having a series instead of parallel LC circuit in a crystal radio

I've been drawing the circuit diagram for a crystal radio I am going to build. (This is my first real electronic project). By using the theoretical knowledge I have, I figure I should have to have an ...
Anthony B's user avatar
  • 127
2 votes
4 answers
7k views

Can I only use a crystal earpiece for my crystal radio?

I am building a crystal radio for my science fair project, and I am having some issues. For my earpiece, I am using a telephone receiver which may be the issue. For my ground, I am using a water ...
Nick Madoff's user avatar
1 vote
2 answers
2k views

How to connect 3.5mm Stereo to crystal radio

I'm attempting to build a crystal radio according to the following schematic: Rather than attaching a piezo electric earphone as shown, I would like to hook the radio up to a stereo amp using a 3.5 ...
WHY's user avatar
  • 115
0 votes
2 answers
1k views

Will four wires work for crystal radio coil?

I'm attempting to build a crystal radio, and I have an old telphone cable with four copper wires, similar to the one pictured. I would like to use it to build the coil for the set, and I was ...
WHY's user avatar
  • 115
7 votes
4 answers
3k views

Why would I use a transformer instead of one inductor in a crystal set?

I'm reading up on A Simple Radio Receiver. I have a question about this image: The signal from the antenna (perhaps a few tens of microvolts, or hundreds for a nearby transmitting station) is ...
user avatar
1 vote
3 answers
688 views

Help troubleshoot my crystal set

My attempt at building a crystal set has resulted in failure. The circuit I used is the simplest one I could find: I tried without a ground and with the ground from the power outlet (I heard that ...
howard's user avatar
  • 297
5 votes
2 answers
338 views

Crystal radio as user interface problem

If I built a coil like the one in this crystal set. How could I use a micro to detect which point the alligator clip is on? Basically I want to use the crystal set as a user interface for an audio ...
user avatar