untitled

7. Slip the knob on the potentiometer shaft and secure with the set
   screw provided.

The tread on potentiometers is about^1 ⁄ 4 " long, so if the wall of your

wooden box is^1 ⁄ 4 " thick, you won’t be able to use the nut to secure the

potentiometer. Instead, glue the face of the potentiometer to the box,

making sure that you don’t get any glue on the rotating shaft of the

potentiometer.

8. Slip the shaft of the variable capacitor through the drilled hole and
   glue the metal body of the capacitor to the wooden box.

Make sure you don’t get any glue on the shaft or other moving parts of

the capacitor.

9. Slip the knob on the variable capacitor shaft and secure with the set
   screw provided.


10. Secure the speaker with four 6-32 flathead screws and four 6-32 nuts.

Variable capacitor

Potentiometer

Speaker

On/off switch

Figure 8-10:
Box with on/
off switch,
potenti-
ometer,
variable
capacitor,
and speaker
in place.

Chapter 8: Surfing the Airwaves 177