Crystal Radio Amplifier

[Dave.H]

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

 

[Dave.H]

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

 

[Dave.H]

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

 

[Dave.H]

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.