• Audio Indicator

    Audio Indicator (46)

    Audio Indicators (DC) - Piezo Buzzer & Electro Mech Buzzer

    Audio indicators are buzzer and sounder products with their own internal drive circuits.  They don’t need external circuity to produce a sound and just require a DC voltage.  Our range includes piezo buzzer and electro-mechanical devices from 1.5 to 24VDC.  We also have mains rated audio indicators. The buzzers are available with PCB pins, flying leads, surface mount or panel mount.  The majority of our products are continuous tone however, we also offer buzzers with slow and fast pulse tones.  Sound outputs range from 75dB to 105dB. To help you find the piezo buzzer you need, you can search the products using the following attributes: rated voltage, sound output, diameter and terminal type.  Data sheets are available on each product page and please click on the product enquiry to request a quote or sample.
  • Piezo elements

    Piezo elements (10)

    Piezo elements

    Piezo elements consist of a piezoelectric ceramic mounted on to a bare metal disc.  When an AC voltage is applied across the electrodes of the piezo electric ceramic, it expands and contracts at the frequency applied causing the element to bend, producing sound waves. Design engineers can use piezo elements within their own housing and enclosure designs.  They offer a low cost solution for generating good sound output and also consume minimal power. Our products range from 12mm to 35mm in diameter and can be supplied with or without leads.  The metal discs we offer are predominantly brass however, the ABT-448-90-RC has a stainless steel disc.  We offer customised products so if you have a particular requirement please give us a call on 01258 456360 and we will try to assist.
  • Audio Transducer

    Audio Transducer (41)

    Piezo Transducer

    The dictionary definition for a transducer is “any device that converts one form of energy into another”. It has a very broad meaning and encompasses electric motors, microphones, speakers and buzzers for example.

    Audio transducer definition:

    An Audio Transducer is a device that converts electrical energy into sound. The type of audio transducers we stock at Alan Butcher Components are Audio Transducer Buzzers. These are small audible alarms that use AC voltage to produce sound and can be classified as either piezo transducers or electro mechanical transducers.  Audio transducers are also known as piezo transducer buzzers, sounders, piezo buzzer and audible alarm buzzer.

    What is the difference between a piezo transducer and an electro mechanical transducer?

    Piezo Transducer – A piezoelectric vibration plate is contained within a moulded housing. When an AC voltage is applied the piezo element inside the case vibrates which generates sound.  https://www.programmingelectronics.com/an-easy-way-to-make-noise-with-arduino-using-tone/
    Electro mechanical transducer – By applying an AC signal, the diaphragm inside the buzzer is pulled towards the core by magnets. Current flowing through a coil produces a fluctuating magnetic field which causes the diaphragm to vibrate and therefore produce sound.

    Audio transducer

    This type of audible alarm require additional circuitry to operate as a buzzer. The advantage of this is that design engineers are able to develop their own drive circuit to produce the optimum sound output for their application. This offers more flexibility than an audio indicator which is driven by DC voltage and contains it’s own drive circuit. The lack of drive circuit also means that audio transducer buzzers tend to be slightly cheaper than audio indicator buzzers. The disadvantage however, is that the design process can be more complicated and time consuming.
    Top Sellers at Alan Butcher Components
    We supply a wide range of audio transducer buzzers here at Alan Butcher Components. Below are some of our top selling items. Piezo transducer buzzers: [products skus="ABT-402-RC,ABT-436-RC,ABT-458-RC"] Electro-mechanical buzzers: [products skus="ABT-410-RC,ABT-414-RC,ABT-425-RC,ABT-427-RC "]
    Piezo Transducer Selection
    When selecting a sounder for your application, there are a few things you need to consider:
    1) Fixing – PCB pins, Leads, Screw terminals, Panel Mount or Surface Mount? How you fix your buzzer within your application is important.
    With PCB pins, you need to know the pin spacing required to fix to your PCB board. You can use the search criteria on our website you can select by Terminal Type and also by Pin Pitch.
    Buzzers with leads have various lead lengths and these can sometimes be customised to suit specific applications. Leads may also be fitted with connectors as per our ABT-469-RC audio transducer buzzers. This simplifies the fixing process even further.
    Screw terminals – some of the larger piezo buzzers come with screw terminals.
    Panel mount – the housings have lugs attached to the side to enable panel mounting.
    Surface mount transducers are usually low profile. One of our smallest devices is the ABMT-801-RC, only 5.5x5x2mm. Solder profiles are often provided on data sheets but can be requested if not shown.
    2) Sound Output This varies considerably between products. Typically, the larger the sounder the higher the sound output. One of our smallest buzzers, the ABT-460-RC is only 6.5mm diameter and 3.6mm high. It’s sound output is 70dB which is still impressive considering it’s size. In contrast our ABT-468-RC generates 110dB and is 40mm diameter, 13mm high. This audible alarm buzzer would be suitable for alarm/warning applications for example, in security or hazardous environments. Sound output will also be influenced by the application itself and environmental conditions.
    3) Position of Sound Vent You will probably have noticed that for the majority of audible alarms the sound is emitted from an opening on the top of the device. You can however purchase buzzers with a sound vent on the side. The ABT-408-RC is a popular audio transducer for designers requiring such a product. The ABT-461-RC is a surface mount option with side sound output.
    4) Feedback Option Some Audio transducers are fitted with a feedback pin or lead. This means they can be run using either DC or AC voltage. If using a square wave (AC), the feedback pin or lead does not need to be connected. The feedback line on a transducer is used to create a voltage which in turn creates a simple, self-oscillating circuit. A reference circuit is provided on the data sheets. This enables the optimum sound levels to be produced. Examples of buzzers with a feedback option are the ABT-468-RC, ABT-467-RC and ABT-469-RC.
    5) Voltage Range The voltage range can be found on the product data sheet for each device. Exceeding the operating voltage is not advisable as it is likely to reduce product reliability. Therefore it is important to establish whether the voltage range of the audible alarm is suitable for your application.

    Piezo Buzzers


    Piezo and electro-mechanical buzzers are widely used across a variety of industries for indication or alarm purposes. Typical applications include;

    Medical Household appliances Toys Timers Industrial Weighing & Measurement Office equipment Leisure industry Control panels Safety & Security Automotive

    UK Distributor - Alan Butcher Components We have been distributing Buzzers & Sounders for over 30 years. During this time we have developed strong working relationships with our suppliers. This is essential for us to be able to support our customers with high quality products and technical expertise. We are able to offer customised solutions, working with both customer and supplier to ensure requirements are met quickly and efficiently. We supply to OEMs of all sizes as well as large mainline distributors. Miniature speakers are also a key part of our audio range.  Determining whether to use an audio transducer vs speaker is an important question.  Our blog “buzzer vs speaker” provides an overview of points to consider when deciding between audio transducer vs speaker.  Click on the link and if you have any questions, give us a call.
    In summary, we have looked at Audio Transducer definition, the types of audio transducer, piezo or electro mechanical, points to consider when selecting a product and the decision between audio transducer vs speaker. For more information and technical assistance, contact us today:

    T: 01258 456360 Email: sales@abcomponents.co.uk Website contact form: https://www.abcomponents.co.uk/contact/

    We look forward to hearing from you!

Buzzers and Sounders

Alan Butcher Components has an extensive range of Buzzers and Sounders to suit most applications requiring an alarm or audio signal.  We can supply piezo, electro-mechanical and surface mount devices as well as bare piezo elements.

Our electro-mechanical and piezo buzzers and sounders are divided into the following categories:

Audio Indicators – these products are self-driven and do not require external circuitry to generate sound.

Audio Transducers – require external circuitry to generate sound.  They enable design engineers to use the power of their own drive circuit or processor to achieve the sound required.

Piezo elements – bare discs, useful where space is limited, can be supplied with or without flying leads and feedback option.

Many of our products are available from stock and the lead-times for non-stock items are not extensive.  In addition, we are able to customise devices by adding leads and or connectors.  Please view our products below or give us a call to see how we can help with any new designs or existing applications.