Crystal Radio Amplifier
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Posted by Dave.H on May 28, 2008, 6:50 am
Please log in for more thread options (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a little audio amp (Cat. KC5152 @ www.jaycar.com.au), and was wondering if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal radio's high impedance output. Any help on this appreciated. Thanks, Dave | ||||||||||||||||||||||
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Posted by Dave.H on May 28, 2008, 6:57 am
Please log in for more thread options Oops, gave the wrong category # for the preamp, this is the correct one, KC5166 | ||||||||||||||||||||||
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Posted by Dave.H on May 28, 2008, 8:34 am
Please log in for more thread options > This may be a stupid question, but I'm about to build a crystal radio
> (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a > little audio amp (Cat. KC5152 @www.jaycar.com.au), and was wondering > if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal > radio's high impedance output. Any help on this appreciated. > > Thanks, > Dave Would the amp work with a 5 watt 8 ohm speaker? I just dug one of these out of my junk box, and want to use it. Dave | ||||||||||||||||||||||
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Posted by Tom Biasi on May 28, 2008, 6:37 pm
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> This may be a stupid question, but I'm about to build a crystal radio
> (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a > little audio amp (Cat. KC5152 @ www.jaycar.com.au), and was wondering > if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal > radio's high impedance output. Any help on this appreciated. > > Thanks, > Dave Hi Dave, Crystal sets are fun to build and can teach something about radio and electronics. They are meant to 'power' a high impedance headphone. Yes you can amplify the signal. You would need an amp with high input impedance and you most likely would need additional amplification to drive the speaker. Keep in mind that all the noise is amplified also. IMHO: Much more fun with just the phones, but by all means experiment. Tom | ||||||||||||||||||||||
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Posted by BobW on May 28, 2008, 7:53 pm
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>
>> This may be a stupid question, but I'm about to build a crystal radio
>> (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a >> little audio amp (Cat. KC5152 @ www.jaycar.com.au), and was wondering >> if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal >> radio's high impedance output. Any help on this appreciated. >> >> Thanks, >> Dave >
> > Hi Dave, > Crystal sets are fun to build and can teach something about radio and > electronics. > They are meant to 'power' a high impedance headphone. Yes you can amplify > the signal. You would need an amp with high input impedance and you most > likely would need additional amplification to drive the speaker. Keep in > mind that all the noise is amplified also. > IMHO: Much more fun with just the phones, but by all means experiment. > > Tom > Yep, all the fun is knowing that what you're hearing is being directly powered by the transmitter. I remember what a blast it was building my first crystal set -- and that was BEFORE radio had even been invented! Of course, if get into trouble, you can always add an antenna amplifier, and then maybe an intermediate down converter, and I suppose a narrow band filter followed by detector and a high-powered audio amplifier. That would work, too. Bob -- == NOTE: I automatically delete all Google Group posts due to uncontrolled SPAM == | ||||||||||||||||||||||
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> (http://www.bobsdata.com/crystal_radio/index.html) and I want to use a
> little audio amp (Cat. KC5152 @www.jaycar.com.au), and was wondering
> if I'd need the matching preamp (Cat. KC5172 @ Jaycar) for the crystal
> radio's high impedance output. Any help on this appreciated.
>
> Thanks,
> Dave