Cristal Radio - Page 2 - Electronic Circuits Projects Diagrams Free

wmmullaney · 8th November 2007, 04:41 PM

Ok, this should work.

audioguru · 8th November 2007, 05:20 PM

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

wmmullaney · 8th November 2007, 06:48 PM

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

audioguru · 8th November 2007, 07:09 PM

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 · 8th November 2007, 07:21 PM

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

audioguru · 8th November 2007, 07:48 PM

My computer doesn't freeze. It has Microsoft Windows XP operating sysyem.

You posted a very fuzzy JPG file type instead of a very clear GIF or PNG file type.

Your pic is a tiny thunbnail instead of a reasonable sized pic.
Your pic looks like this:

wmmullaney · 8th November 2007, 08:52 PM

Sorry, this should work. 5.5 kb PNG

audioguru · 8th November 2007, 11:44 PM

Did you make that extremely simple "radio"?
Does it receive many AM stations all at the same time?
Are strong local stations very loud and weak distant stations very low level?
Does it receive interference from everything electrical?
Doesn't AM radio sound awful?

wmmullaney · 8th November 2007, 11:47 PM

I don't know, i need an amplifier to boost the output because i don't have a pizoelectric earphone.

RadioRon · 9th November 2007, 01:13 AM

One temporary way around this problem is to find an old stereo receiver that has a "Phono" input on the back. As a temporary measure, this will give you an easy-to-use amplifier that will drive 8 ohm headphones or speakers. It may seem silly to use a big receiver to help with a simple crystal radio but in our business it is quite common to replace sections of a circuit we are developing with off-the-shelf functional boxes so that we can concentrate on one thing at a time. The Phono input on an old stereo is usually a fairly high impedance and is very very sensitive, so it will interface directly with your crystal radio detector. Once you have the crystal detector working well, you can then get a simple audio amplifier kit such as this one to replace the stereo:

http://store.qkits.com/moreinfo.cfm/FK602
or
http://www.electronickits.com/kit/co...ampl/ck701.htm

I recommend a kit like this for the beginner as you are more likely to get it working than if you build it from scratch.

wmmullaney · 9th November 2007, 01:16 AM

Thanks, I'll try it. I will,(in the future) get a LM386 to drive it.

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8th November 2007, 04:41 PM	(permalink)
wmmullaney	Ok, this should work.

8th November 2007, 05:20 PM	(permalink)
audioguru	Please attach the schematic here to your reply instead of posting it at Fortune City where we have denied access. __________________ Uncle $crooge

8th November 2007, 06:48 PM	(permalink)
wmmullaney	Sorry, I'm using a mac and don't know how to do that.

8th November 2007, 11:44 PM	(permalink)
audioguru	Did you make that extremely simple "radio"? Does it receive many AM stations all at the same time? Are strong local stations very loud and weak distant stations very low level? Does it receive interference from everything electrical? Doesn't AM radio sound awful? __________________ Uncle $crooge

8th November 2007, 11:47 PM	(permalink)
wmmullaney	I don't know, i need an amplifier to boost the output because i don't have a pizoelectric earphone.

9th November 2007, 01:13 AM	(permalink)
RadioRon	One temporary way around this problem is to find an old stereo receiver that has a "Phono" input on the back. As a temporary measure, this will give you an easy-to-use amplifier that will drive 8 ohm headphones or speakers. It may seem silly to use a big receiver to help with a simple crystal radio but in our business it is quite common to replace sections of a circuit we are developing with off-the-shelf functional boxes so that we can concentrate on one thing at a time. The Phono input on an old stereo is usually a fairly high impedance and is very very sensitive, so it will interface directly with your crystal radio detector. Once you have the crystal detector working well, you can then get a simple audio amplifier kit such as this one to replace the stereo: http://store.qkits.com/moreinfo.cfm/FK602 or http://www.electronickits.com/kit/co...ampl/ck701.htm I recommend a kit like this for the beginner as you are more likely to get it working than if you build it from scratch. __________________ RadioRon

9th November 2007, 01:16 AM	(permalink)
wmmullaney	Thanks, I'll try it. I will,(in the future) get a LM386 to drive it.