User manual

57 2 Design and Assembly
Alternatively, you can build a speaker with a piece of
thin cardboard, or you attach the piezo buzzer with a strip of
adhesive tape directly to the inside of the flap lid.
Search coil
The included search coil has to be glued to the bottom
inside the flip pack. Place it inside the flip pack, centered
and as far away from other components as possibly. Fix it
with common all-purpose glue. It is important that the coil
leads are on the right-hand side near the circuit board. Aer
gluing in the coil, it is recommended to coat the loops of the
coil generously with glue. This increases the operational
safety of the device. When the glue has dried, the coil loops
can no longer move relative to each other. This significantly
reduces the occurrence of false signals. It is important that
you generously apply glue to fix the individual loops of the
Fig. 2.8:
Attaching the coil