Cristal Radio

[wmmullaney]

Hi guys, i am building a simple crystal radio. I need a circuit that will boost the output signal to drive regular headphones.

thanks

 

[audioguru]

Many people use an LM386 little power amplifier IC to drive headphones.

 

[Nigel Goodwin]

I've got this strange feeling of 'deja vu'

 

[wmmullaney]

OK, thanks. Can you give me a pinout?

 

[Papabravo]

You need to learn how to do this for yourself.
1. Goto **broken link removed** This is the URL for National Semiconductor, the original manufacturer of the LM386.
2. Enter LM386 in the search box. It will take you to this page. **broken link removed**
3. Download the PDF version of the datasheet. which looks like this: https://www.electro-tech-online.com/custompdfs/2007/11/LM386.pdf

You'll need Adobe Acrobat reader which is also a free download from Adobe Systems.

Now that I've taught you to fish, I expect you'll be able to feed yourself for a lifetime, or some reasonable approximation therof. Good luck and happy fishing.

 

[Roff]

I've got this strange feeling of 'deja vu'

Do you furriners know who Yogi Berra is? If you click on the link, look at some of his other quotes while you're there.

 

[Nigel Goodwin]

Do you furriners know who Yogi Berra is? If you click on the link, look at some of his other quotes while you're there.

Never heard of him!, my quote actually came from 'Monty Python'.

 

[wmmullaney]

Alright, thanks. I guess i should tell you i'm 12. This is not a school project.
I will look at datasheets.

 

[JimB]

Do you furriners know who Yogi Berra is?

Doesn't he live in Jellystone Park with his little friend BooBoo?

JimB

 

[wmmullaney]

Thats Yogi Bear.

 

[stevez]

If you are really interested in a crystal radio I might be able to dig up a schematic from my archives. It's a crystal radio however it has a vacuum tube RF amp that delivers a higher level to the crystal (detector). The author claims the quality of sound is better because the diode is operating more linearly. The higher voltage comes from 9 volt batteries in series - maybe 10 or 12 of them. Along with improved quality is the increase in output - enough for headphone per the author.

Yes, you could the same with a transistor or IC - amplify the RF rather than the audio.

 

[wmmullaney]

OK, thanks. This is the schematic i'm using.

**broken link removed**

 

[audioguru]

Your Fortune City link does not work.
Attach the schematic here to your reply.

 

[Roff]

Your Fortune City link does not work.
Attach the schematic here to your reply.

https://members.fortunecity.com/timevehicle/free_energy/crystal_radio.gif

 

[audioguru]

I get: **broken link removed**

 

[wmmullaney]

Ok, this should work.

**broken link removed**

 

[audioguru]

Please attach the schematic here to your reply instead of posting it at Fortune City where we have denied access.

 

[wmmullaney]

Sorry, I'm using a mac and don't know how to do that.

 

[audioguru]

A MAC? An apple computer?
Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! Hee, Hee, Haw, Haw, Hee! (I am sorry for laughing)

During a reply, click on "Go Advanced" then click on "Manage Attachments". Then click on "Browse" and find and double-click on the file in your pc with the schematic. Click on "Upload".

I did it now with this rectifier circuit.

 

[wmmullaney]

Somehow I'm the one laughing when your computer freezes and won't start up again.