Asked by: Phil Lawton
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- Orders placed online before 3:00pm Monday - Friday (excluding public holidays and our Christmas shutdown period) are always dispatched the same day provided the goods are in stock. If the goods are not in stock we will endeavour to contact you as soon as possible to discuss a dispatch date.
UK Deliveries
- If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost £3.95 (£4.74 including VAT) if you spend less than £40 (£48 including VAT).
- If you spend between £40 and £200 (£48 - £240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, £12 (£14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and £15 (£18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate: remote area list.
- If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.
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- These orders are sent via UPS, and the cost is dependant on the service you choose at checkout. Alternatively you can choose the free collection option and have your own courier collect it from us. International orders can only be shipped to the registered card address. Please note: International orders may be charged import duty dependant on local import laws and duty rates. These charges are usually billed to you directly from UPS.
- Delivery times vary for international orders depending on the service selected and the destination. You can see the delivery time and cost at the shipping stage, or by using the shipping estimator from within the shipping basket.
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- If you would like to collect your order, or use your own courier then there is an option you can select during checkout. We do not charge a packaging or handling fee for this service, and you will receive an email when your order has been processed, you can collect half an hour after receipt of this email.
Further Information
- For information about all of the delivery options we offer see full delivery details.
Q:
Excuse my ignorance but what is the difference between a buzzer with a drive and one without? What does 'drive' mean? Thanks
A:
As you say there are two types of buzzer, with and without drive. A piezo element in its simplest form is without drive and needs to be driven with a square wave. This can be done through a microcontroller such as a PICAXE IC or through a timer chip such as the 555 timer in its astable mode. The benefit of the buzzers without drive is they are both cheaper and the frequency of the tone can be change, so can be used to play tunes. The buzzers with drive have additional circuitry which generates a fixed tone, in effect they are doing the job of providing the square wave and have the element all in one package. Because of the extra components inside the unit they are a little more money, but give you the simplicity of just being able to connect power to the device. The buzzer you are looking at is an electromech
anical buzzer. The way the drive works inside this buzzer, is that there is a coil which when powered pushes the part that moves the air forward, this section is also set up so that it disconnects power to the coil and then a spring returns it. This pulls the part that moves the air back in and reconnects the power to the coil. This then causes it to repeat the sequence, this happens about 400 times a second and results in a fairly low pitch frequency. The piezo buzzers with drive are a much higher frequency about 4Khz compared to the 400Hz of the electromechanical buzzer.
anical buzzer. The way the drive works inside this buzzer, is that there is a coil which when powered pushes the part that moves the air forward, this section is also set up so that it disconnects power to the coil and then a spring returns it. This pulls the part that moves the air back in and reconnects the power to the coil. This then causes it to repeat the sequence, this happens about 400 times a second and results in a fairly low pitch frequency. The piezo buzzers with drive are a much higher frequency about 4Khz compared to the 400Hz of the electromechanical buzzer.
Answered by: Geoff Hampson
17-Sep-12
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