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參數(shù)資料
| 型號： | KBS-20DB-4A-22 |
| 廠商： | AVX Corporation |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | BUZZER PIEZO 4KHZ 20MM |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 系列： | KBS, Kyocera |
| 驅(qū)動(dòng)器電路： | 傳感器，外部驅(qū)動(dòng) |
| 技術(shù)： | 壓電 |
| 輸入類型： | 峰值-峰值信號 |
| 電壓 - 額定： | 10Vp-p |
| 頻率： | 4kHz |
| 聲壓級： | 70dB @ 10V，30cm |
| 可清洗： | 無 |
| 安裝類型： | 底座安裝 |
| 端子： | 導(dǎo)線引線 |
| 尺寸/尺寸： | 圓形 - 23.00mm 直徑 x 4.40mm H |
| 包裝： | 散裝 |
| 電容 @ 頻率： | 17000pF @ 4kHz |
6
Piezoelectric Acoustic Generators
NOTE: Wherever possible, the piezo devices should be
capacitive coupled to avoid permanent DC bias and possible
long term damage.
Amplification Type Circuits
Oscillation Type Circuits
BZ
Vcc
L1
L2
Q1
R1
Blocking Oscillation Type
This is the most effective circuit when loud sound pressure
is required, and the supply voltage is low. This circuit
operates in the same manner as the Load Inductance type.
The duty factor will be large and the spurious oscillation will
increase if the inductance of the transformer is small.
L1=550T (30mH)
L2=150T
Bz=KBS-27DB-3A
Vcc
Current
Frequency
R1
1.5V
2.2mA
3kHz
38.9k
3.5V
4.1mA
3kHz
63.7k
4.5V
6.0mA
3kHz
74.8k
CR Oscillation Type
It is easy to generate a sine wave when the high
frequency component is small, which will result in good tone
quality. However, sound pressure is low. The larger the h
FE
of the transistor is, the more stable the oscillation.
Vcc
Current
Frequency
15.5V
7.7mA
2.25-3.3kHz
12.5V
6.0mA
2.25-5.1kHz
9.5V
4.6mA
2.15-3.0kHz
6.5V
3.0mA
2.15-2.9kHz
-4.5V
2.2mA
2.05-2.8kHz
The transducer is connected between the collectors of
two transistors of a multivibrator which generates a stable
square wave. The shoulders of the square wave are
rounded due to this, but V
pp will be double Vcc.
Vcc
Current
Frequency
1.5V
3.3mA
2.8kHz
3.5V
7.1mA
3.2kHz
Multivibrator Type
Vcc
580
7.5k
7.5k
580
0.02
F
0.02
F
BZ
Q1
Q2
Vcc
Q1
2k
1k
BZ
2k
150k
1k
0.01
F
0.01
F
0.01
F
Load Resistance Type
This is the simplest circuit. Applied voltage V
pp will be Vcc.
Loud sound pressure cannot be achieved. For example,
Vcc=5V
B2=KBS-27DB-3A
f=3.3kHz
R1=30k
R2=15k
R3=1k
Two-step amplification using transistors: The transducer is
connected between the collectors of each transistor making
the applied voltage (V
pp) 2xVcc.
INPUT SIGNAL
R2
Q1
Q2
BZ
R5
R1
R3
R4
Vcc
GND
Vcc
INPUT SIGNAL
BZ
R3
Q1
R2
R1
Complementary Type
In this example, the sound pressure level is relatively
low. It is effective for reducing current consumption, and
when a highly efficient circuit is the goal.
Vcc
INPUT SIGNAL
GND
Q1
R1
BZ
Load Inductance Type
High voltage can be applied to the transducer by using
load inductance. The smaller the “L” is, the higher the peak
voltage. However, the current consumption will increase,
also increasing the spurious oscillation, which results in
degradation of the tone quality.
Vcc
Q1
INPUT SIGNAL
GND
R2
L
R1
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