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Sci.Electronics.Basics -> Crystal Radio Amplifier
There are 8 messages in this thread.
You are currently looking at messages 1 to 8.
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Author: Dave.HDate: 06:50 28-05-08
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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
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Author: Dave.HDate: 06:57 28-05-08
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On May 28, 8:50 pm, "Dave.H" <the19...@googlemail.com> wrote:
> 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
Oops, gave the wrong category # for the preamp, this is the correct
one, KC5166
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Author: Dave.HDate: 08:34 28-05-08
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On May 28, 8:50 pm, "Dave.H" <the19...@googlemail.com> wrote:
> 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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Author: Tom BiasiDate: 18:37 28-05-08
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"Dave.H" <the1930s@googlemail.com> wrote in message
news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb@j33g2000pri.googlegroups.com...
> 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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Author: BobWDate: 19:53 28-05-08
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"Tom Biasi" <tombiasi@optonline.net> wrote in message
news:lL-dndLBKIY5Q6DVnZ2dnUVZ_oPinZ2d@giganews.com...
>
> "Dave.H" <the1930s@googlemail.com> wrote in message
> news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb@j33g2000pri.googlegroups.com...
>> 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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Author: Tom BiasiDate: 20:14 28-05-08
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"BobW" <nimby_NEEDSPAM@roadrunner.com> wrote in message
news:2LCdnY3rtvESbaDVnZ2dnUVZ_ovinZ2d@giganews.com...
>
> "Tom Biasi" <tombiasi@optonline.net> wrote in message
> news:lL-dndLBKIY5Q6DVnZ2dnUVZ_oPinZ2d@giganews.com...
>>
>> "Dave.H" <the1930s@googlemail.com> wrote in message
>> news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb@j33g2000pri.googlegroups.com...
>>> 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 ==
>
>
I think you got my point precisely.
Tom
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Author: Dave.HDate: 04:13 29-05-08
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On May 29, 8:37 am, "Tom Biasi" <tombi...@optonline.net> wrote:
> "Dave.H" <the19...@googlemail.com> wrote in message
>
> news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb@j33g2000pri.googlegroups.com...
>
> > 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
So I do need the preamp? I intend on using headphones, most of the
time, but sometimes I like to have a bit of background noise, and
headphones just don't work for that. This amp will probably also be
used with the Hiker's One regenerative radio I'm also planning on
building.
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Author: Tom BiasiDate: 06:53 29-05-08
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"Dave.H" <the1930s@googlemail.com> wrote in message
news:823ca1ca-d17b-4b83-9d97-8cefa107d48d@a9g2000prl.googlegroups.com...
> On May 29, 8:37 am, "Tom Biasi" <tombi...@optonline.net> wrote:
>> "Dave.H" <the19...@googlemail.com> wrote in message
>>
>> news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb@j33g2000pri.googlegroups.com...
>>
>> > 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
>
> So I do need the preamp? I intend on using headphones, most of the
> time, but sometimes I like to have a bit of background noise, and
> headphones just don't work for that. This amp will probably also be
> used with the Hiker's One regenerative radio I'm also planning on
> building.
Use a preAmp.
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