Thursday, December 1

Piezo Audio Transducer VS Piezo Audio Buzzer

Audio Indicators vs. Audio Transducers

As mentioned earlier in the presentation, piezo and magnetic indicators have the driving circuitry built into the design, creating a plug and play solution. Because of this, engineers do not need to worry about building a complex circuit to drive the buzzer. The disadvantage, however, is that indicators operate on a fixed frequency, reducing the flexibility offered to achieve an alternate frequency as application requirements change. Transducers, on the other hand, do not have the driving circuit built-in, so engineers are offered a greater range of flexibility when designing their circuit. The downside comes in the fact that transducers do require an external driving signal to operate properly, potentially adding complexity and time to the design cycle.

Audio Indicator Characteristics

Built-in driving circuit (frequency generator)
Simple to design-in
Fixed frequency (function)

Audio Transducer Characteristics

External driving circuit required
Complex to design-in
User-selected frequencies or multiple frequencies


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Wednesday, November 30

Piezo vs. Magnetic Buzzers

Piezo Buzzer VS. Magnetic Buzzer

Piezo Buzzer Characteristics

  • Wide operating voltage: 3~250V
  • Lower current consumption: less than 30mA
  • Higher rated frequency
  • Larger footprint
  • Higher sound pressure level

Magnetic Buzzer Characteristics

  • Narrow operating voltage: 1~16V
  • Higher current consumption: 30~100mA
  • Lower rated frequency
  • Smaller footprint
  • Lower sound pressure level




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What is Piezo Buzzer,Piezo audio indicator ?

The heart of piezo buzzers are a piezoelectric ceramic plate. Piezoelectric ceramics generate electricity when they experience mechanical force and, more important to a buzzer’s function, create force when exposed to an electric field. When the ceramic experiences an alternating voltage, the plate extends and shrinks. It is glued to a fixed metal plate so these forces cause the ceramic to flex, creating the buzzing sound.


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Piezo Audio Indicator HP3025XW


Buzzer Datasheet:

HP3025XW  PDF Datasheet Download

Lead wire type 
Internal-Driven (With oscillator circuit)
Dia 30 x25mm  Worked with 12V DC , Output3.5K Hz 90dB at 10cm

Type
UNIT
HP3025AXW
HP3025BXW
*Min. Sound Output at10cm
dB
90
90
Rated Voltage
VDC
12
12
Operating Voltage
VDC
3~20
3~20
Resonant Frequency
Hz
3500±500
3500±500
*Max. Current Consumption
mA
10
10
Tone Nature

Continuous
Pulse 1-4Hz
Operating Temperature
°C
-20~+70
Storage Temperature
°C
-30~+80
Weight
g
13

Value applying at rated voltage 

DIMENSIONS     Unit:mm     Tolerance:±0.5






What is magnetic buzzer ? Magnetic buzzer HCM1212X ,HCM1205X

Magnetic buzzers use a coil wrapped around a pole. A metal plate is mounted a short distance from one end of the pole. The coil creates a magnetic field in the pole which attracts the plate, but since the plate is fixed the center flexes towards the pole. As the electrical signal varies, the magnetic field varies and the plate vibrates.


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Magnetic Buzzer,  Electromagnetic Buzzer HCM12X

Micro Magnetic Buzzer ,Electromagnetic Buzzer :HCM1203X ,HCM1205X ,HCM1206X,HCM1212X ,Applied to  Home appliance,  safety equipment etc for alarm .

Buzzer Datasheet:

HCM12X  PDF Datasheet Download

Pin termina  Type

Internal-Driven (With oscillator circuit)
Dia 12 x 9.5mm. 1.5~12V DC,Output 2.3K Hz 85dB at 10cm

Type
HCM1203X
HCM1205X
HCM1206X
HCM1212X
Rated Voltage        (V)
3
5
6
12
Operating  Voltage  (V)
2~5
3~7
4~8
8~15
Rated Current     (MA)
< 30
< 30
< 30
< 30
Sound Output at10cm(dB)
> 80
> 85
> 85
> 85
Resonant Frequency  (Hz)
2300 ± 400
2300  ±300
2300  ±300
2300 ±300
Response Time     (ms)
< 50
< 50
< 50
< 50
Operating Temperature  (°C)
-10~+50
-25~+70
-25~+70
-25~+70
Storage  Temperature  (°C)
-15~+60
-30~+80
-30~+80
-30~+80
Weight                (g)
2
2
2
2

Value applying at rated voltage

DIMENSIONS     Unit:mm     Tolerance:±0.5


Piezo buzzer Vs. Magnetic Buzzers

Buzzers are a simple and inexpensive way to allow your device to make simple sounds ranging from a click when a key is pressed to a warning tone when readings fall outside of safe ranges. We offer two technologies, piezo and magnetic buzzers, and
it’s important to understand the benefits of each before deciding on the right choice for your device.
How They Work
The heart of piezo buzzers are a piezoelectric ceramic plate. Piezoelectric ceramics generate electricity when they experience mechanical force and, more important to a buzzer’s function, create force when exposed to an electric field. When the ceramic experiences an alternating voltage, the plate extends and shrinks. It is glued to a fixed metal plate so these forces cause the ceramic to flex, creating the buzzing sound.
Magnetic buzzers use a coil wrapped around a pole. A metal plate is mounted a short distance from one end of the pole. The coil creates a magnetic field in the pole which attracts the plate, but since the plate is fixed the center flexes towards the pole. As the electrical signal varies, the magnetic field varies and the plate vibrates.
Which Is Better?
The preferred solution depends on your device’s needs. Piezo buzzers can operate at much higher voltages than magnetic buzzers can. For the same voltage piezo devices use less current. Finally, piezo buzzers put out higher sound pressure than magnetic buzzers. However magnetic buzzers have one big advantage important to manufacturers: size.
Magnetic buzzers have a much smaller footprint than equivalent piezo buzzers. This is a critical feature in mobile devices. Consumers demand smaller and smaller phones, tablets, and other electronics and many modern devices simply can’t spare the room a piezo buzzer needs. A microwave oven might work fine with a piezo buzzer but a device meant to go into a pocket is going to need a magnetic buzzer.
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Tuesday, October 11

USB Mosquito Kill Lamp with led


USB Mosquito Killer Lamp EMK-01U

USB Mosquito Killer Lamp Photocatalyst Flycatcher Zapper with 6 LED Night Light Insect Fly Pest Killing

1. Physical principles

1. Using special led light to attract mosquitoes
2. Through a powerful fan suction the mosquitoes into the mosquito box, then mosquitoes will death because of air dried .

2. Applicability

It can be widely used in crop farming, livestock breeding industry, schools, hospitals, parks, urban greening, garden villas.

3. Advantage

These product series can efficiently trap and kill more than 30 kinds of harmful insects, such as mosquitoes, armyworms, moths, pine sawyer beetles, beetles,mole crickets, locusts, white-winged, and flying ants

USB mosquito killer lamp

1. voltage:5V,USB cable input.220V/5V.
2. power:2W
3. effect area:20SQM(square meter)
4. 6pcs purple Leds+ fan
5. size:160*200mm(H)6:NW:0.55kg

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http://www.kailiec.com/product/Wholesale-USB-Mosquito-Killer-Lamp.html