Cristal Radio

wmmullaney

New Member

• Nov 7, 2007

• #1

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

Well-Known Member

Most Helpful Member

• Nov 7, 2007

• #2

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

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Nov 7, 2007

• #3

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

 

wmmullaney

New Member

• Nov 7, 2007

• #4

OK, thanks. Can you give me a pinout?

 

Papabravo

Well-Known Member

• Nov 7, 2007

• #5

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.

 

Last edited: Nov 7, 2007

Roff

Well-Known Member

• Nov 7, 2007

• #6

Nigel Goodwin said:

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

Click to expand...

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

Super Moderator

Most Helpful Member

• Nov 8, 2007

• #7

Roff said:

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.

Click to expand...

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

 

wmmullaney

New Member

• Nov 8, 2007

• #8

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

 

JimB

Super Moderator

Most Helpful Member

• Nov 8, 2007

• #9

Roff said:

Do you furriners know who Yogi Berra is?

Click to expand...

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

JimB

 

wmmullaney

New Member

• Nov 8, 2007

• #10

Thats Yogi Bear.

 

S

stevez

Active Member

• Nov 8, 2007

• #11

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

New Member

• Nov 8, 2007

• #12

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

**broken link removed**

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 8, 2007

• #13

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

 

Roff

Well-Known Member

• Nov 8, 2007

• #14

audioguru said:

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

Click to expand...

Code:

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

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 8, 2007

• #15

I get: **broken link removed**

 

wmmullaney

New Member

• Nov 8, 2007

• #16

Ok, this should work.

**broken link removed**

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 8, 2007

• #17

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

 

wmmullaney

New Member

• Nov 8, 2007

• #18

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

 

audioguru

Well-Known Member

Most Helpful Member

• Nov 8, 2007

• #19

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.

 

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wmmullaney

New Member

• Nov 8, 2007

• #20

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

 

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