6. ADD AN ENCLOSURE
6a. Remove the power switch
(S1) and the speaker on/off
slide switch (S2) from the
counter PCB, replace the
slide with another toggle, and
wire the 2 toggles offboard
using 6" lengths of wire.
6b. If you added an analog
meter, also remove its SPDT
toggle switch and connect it
offboard with wire leads.
6c. Use a Dremel or other tool
to cut holes in the enclosure’s
front panel for mounting the
toggles and the meter, if used.
If you’re using the GMT-01
or another tube with a
window for alpha particles,
cut a matching window in the
side of the enclosure.
6a
6d. Mount the toggle and
meter (if used) to the front
panel. Secure the circuitry
and tube inside using your
preferred method.
For the PCB, you can drill
holes in the board and lash it
down inside the case using
insulated wire anchored
around machine screws,
washers, and nuts.
For the GM tube, run
4 machine screws longer
than the tube’s diameter up
through the bottom of the
case to surround the tube,
secure the screws with washers and nuts, and lash the
tube underneath with wire.
Align the tube to its window
if it has one. Enjoy your new
Geiger counter!
6d
6d
NOTES: The plastic will not
block much beta or gamma
radiation.
Label the panel components
and decorate the enclosure
as desired.
TEST BUILDERS:
Brian Melani and
Dan Spangler, MAKE Labs
109 Follow us @make
