Franzis Verlag Course material Metalldetektor zum Selberbauen 65241 14 years and over 65241 Benutzerhandbuch
Produktcode
65241
79
A Appendix
No metal detection
First, the initialization routine is executed correctly
(leDs light up and a tone sequence is emitted). then you
hear a rhythmic clicking sound from the speakers. When
approaching metal with the search coil, one of the leDs
should now light up and the speaker should emit a sound.
hear a rhythmic clicking sound from the speakers. When
approaching metal with the search coil, one of the leDs
should now light up and the speaker should emit a sound.
if this does not happen, there might be a problem with
the connection of the search coil. Check the connection of
the coil wire ends with the appropriate soldering pad. it is
important to tin-coat the wire ends before you solder them.
the coil wire ends with the appropriate soldering pad. it is
important to tin-coat the wire ends before you solder them.
Intermittent LED and sound
signals
When the leDs light up without apparent reason and
when the detector repeatedly emits short tones, you should
check the whole assembly for mechanical stability. are all
check the whole assembly for mechanical stability. are all
Important:
a clearly audible volume can only be achieved by
attaching a suitable resonator to the piezo buzzer.
it is essential to construct a piezo speaker as described
on page 55.
attaching a suitable resonator to the piezo buzzer.
it is essential to construct a piezo speaker as described
on page 55.