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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) Jaycar) for the crystal
radio's high impedance output. Any help on this appreciated.

Thanks,
Dave

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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) Jaycar) for the crystal
radio's high impedance output. Any help on this appreciated.

Thanks,
Dave

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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) Jaycar) for the crystal
radio's high impedance output. Any help on this appreciated.

Thanks,
Dave

"Dave.H" <the1930s at (no spam) googlemail.com> wrote in message
news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb at (no spam) 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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) 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

"Tom Biasi" <tombiasi at (no spam) optonline.net> wrote in message
news:lL-dndLBKIY5Q6DVnZ2dnUVZ_oPinZ2d at (no spam) giganews.com...

"Dave.H" <the1930s at (no spam) googlemail.com> wrote in message
news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb at (no spam) 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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) 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.

"Dave.H" <the19... at (no spam) googlemail.com> wrote in message

news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb at (no spam) 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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) 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

On May 29, 8:37 am, "Tom Biasi" <tombi... at (no spam) optonline.net> wrote:
"Dave.H" <the19... at (no spam) googlemail.com> wrote in message

news:7bf4fd01-864f-42ec-b13b-cd5f9c06b3cb at (no spam) 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 at (no spam) www.jaycar.com.au), and was wondering
if I'd need the matching preamp (Cat. KC5172 at (no spam) 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.