Philmore with Galena
Home Made Crystal Stand
Razor Blade and Pencil Lead
Carbon Edges with Sewing Needle
Beam with Pencil Lead
Razor Blade Edges
Home Made Base to Match Xtal Set
Home Made Razor Blade and Pencil Lead Stand
If you have built crystal sets in the past, then
I will be preaching to the choir.
If you are new to this let me say a few things about detectors.
These are passive
detectors. They rectify the ac signal into pulsating dc. It
is easy to build a crystal set.
It is not easy to build a good crystal set. Many variables
complicate our task. Every
Part of the crystal set play an important part, from the antenna to the
The detection can be performed by many simple items. A good diode
be best. That said you must play with detectors, they are
amazingly fun. Take notes
as you learn. If all else in your crystal set is good then the
detector will control
how loud and sensitive your set is. When you have a good working
set sort through your
diodes by trying them one at a time without re-tuning
your set. One or more will be
the best diode for volume. Use this diode as your standard for
testing detectors. Do not
use a audio amplifier when testing detectors, use head phones.
The first stage of your
audio amp can act as a detector giving you false results. When
testing detectors use German
Silver or Phosphorus Bronze for your cats whisker. Cut the tip of
your cats whisker with scissors
not side cutters. You want a flat end. Try all the rocks in
your collection. Pressure is important
too little or too much changes the results. Rectification can
occur by the fact there is a natural
semiconductor or dissimilar materials and or imperfect contact.
I like my double razor blade detector with the edges up, you can
place many objects on the
blades and see what happens, it is quick and easy. I like the
beam detector using pencil
lead, it is quick and easy to change materials to see what works.
When it crackles in your phones just move it a little or bang on the
table to make
it come alive. Have fun.