– 55 –
2. Buzzer Circuit
Fig. 2-1 Buzzer Circuit
Sound wave
Metal diaphragm
V
Pizoelectric element
V
Fig. 2-2 Buzzer Operation
Microcomputer
Buzzer output
BZ
12V
0V
R722
Q722
30
BZ
●
When the buzzer sounds, an approx.
3.9kHz square signal is output from buzzer
output pin of the microcomputer. After
the amplitude of this signal has been set
to 12Vp-p by a transistor, it is applied to
the buzzer. The piezoelectric element in
the buzzer oscillates to generate the
buzzer’s sound.
30
Summary of Contents for RAC-50DH7
Page 30: ... 29 CIRCUIT DIAGRAM Wired Remote Control ...
Page 31: ... 31 CIRCUIT DIAGRAM MODEL RAD 50DH7A RAD 60DH7A RAD 70DH7A ...
Page 32: ... 33 CIRCUIT DIAGRAM MODEL RAC 50DH7 RAC 60DH7 RAC 70DH7 ...
Page 35: ... 39 51 53 53 55 57 49 29 66 Heating ...
Page 76: ... 86 SELF DIAGNOSIS LIGHTING MODE MODEL RAC 50DH7 RAC 60DH7 RAC 70DH7 ...
Page 79: ... 89 2 Outdoor unit does not operate but receives remote infrared signal ...
Page 82: ... 92 CHECKING THE REMOTE CONTROLLER ...
Page 87: ... 97 16 ...
