Bring your amplifier case design projects up to date with our new Bluetooth Amplifier Kit and play music from a phone, tablet or computer wirelessly. The kit is available in 3 different formats; on its own with no speakers, with 4ohm 65mm speakers included or with 8ohm 100mm speakers included. For the two speaker options, the speakers are supplied unconnected to allow for cable lengths and cable routing to be personalised to specific enclosure designs. The power switch for all three options is supplied unmounted so an alternative power switch can be used.
The amplifier at the heart of this kit is a 3W Class-D amplifier which not only delivers excellent audio quality, it is also very light weight and doesn't require the use of a heat sink. This greatly reduces the factors that need to be taken into account when designing your own enclosures.
The user interface is a simple on/off switch. When powered on, the Bluetooth module has been programmed to automatically try to reconnect to the last device it was paired with and where this is not possible it will instead enter pairing mode. After testing various iterations, we determined that automating this process led to a much more satisfying user experience.
You can power the Bluetooth Amplifier Kit using either a 1A USB supply or LiPo battery(with JST connector). Both available separately. It also features an integrated LiPo battery charging circuit, for battery capacities between 400mAh to 1000mAh, for those who also want a portable mains free solution, with automatic battery charging and switch over between PSU and battery (when battery present). A 1000mAh LiPo battery can provide up to 28 hours of continuous operation at ‘normal’ volume.
The board features an LED and sounds which are used to indicate status information, such as pairing status. There is also an optional connection point for an off-board LED, for designs where the USB power and LED want to be on different enclosure faces.
- As the speakers and the power switch are supplied unconnected, some soldering is required .
- Speaker wire is supplied with all three buying options.
- 3W audio amplifier with Bluetooth link (based on a fully CE compliant module).
- Play music from a phone, tablet or computer wirelessly.
- A simple user interface, via single on / off switch.
- Auto-reconnect or enters pairing mode on power-up.
- LED and sounds indicate status information such as paring status.
- Optional connection point for additional off-board LED.
- Can be powered from a 1A micro USB supply or LiPo battery (both available separately).
- Includes automatic LiPo charging for battery capacities between 400mAh to 1000mAh.
- Speakers supplied unconnected allowing cable lengths and cable routing to be personalised to specific enclosure designs.
This is an enclosure that we designed and 3D printed to serve as an example.
|Buying Option.||Pre-built PCB.||Power Switch.||Speaker Wire.||2 x 65mm 4 ohm speakers.||2 x 100mm 8 ohm speakers.|
- PCB Length: 64mm.
- PCB Width: 53mm.
- PCB Max Height Without Switch: 7mm.
- PCB Max Height With Switch: 8.5mm.
- Either a 1A USB supply or LiPo battery (with JST connector).
- Soldering Iron.
- Wire Cutters.
- Wire Strippers.
This product is designed and manufactured in the UK by Kitronik.
Same Day Dispatch
- 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.
- 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.
Rest of the world
- 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.
- 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.
- For information about all of the delivery options we offer see full delivery details.
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Hello Tom, Although we haven’t tried this ourselves it should in theory be possible. You would need to ensure that you don’t provide any more than 5.5V to the board and you also use a blocking diode to stop current flowing back into the solar cell. A solar cell such as this and a diode such as this should be suitable, 3605-50v-200ma-polycrystalline-solar-cel and 1n4001-diode You could use a micro USB lead to connect this to the micro USB port on the board. The time it would take to charge the battery would vary depending on how much sunlight the circuit gets and a 200mA output from the solar cell is the best case situation.
Thank you for your email, you could do but the amplifier will not last very long at all.
Thank you for your email, in theory you could if you put a resistor between the 9V battery and the Blue tooth amp to account for the additional voltage. You would also need some sort of converter to plug into the board.
however this is likely to increase the current draw of the kit and most 9V batteries do not hold much charge so would probably be about 20% of the run time as the Lipo.
In addition I would recommend against having the power plug and the battery in at the same time as you could then loop the power into the battery which could over heat the battery.
Finally this may affect the reliability of the blue tooth with the power it needs. So in theory yes, in practicality I would not recommend it.
It can be pretty loud, its probably similar volume to a radio or music players.
Thank you for your question, in theory potentially yes but you would need to have quite a powerful resistors as the kits rated for around 5V not 12V. It would also depend on how much current you are supplying to other parts of the dolls house and how you have set up the circuit to divide current and voltage.
So yes you could in theory but it would depend on the circuit and you adding powerful resistors in before the amplifier.
Thank you for your question, this is not currently a functionality this kit has and we are not currently looking at adding it as functionality.
Thank you for your email, assuming you are charging from a 500mA power supply and the kit is drawing it's maximum current of about 120mA then you would be looking at 380mA an hour so about 3 hours all told.
Thank you for your question, it will play while charging that's not a problem.
The kit contains a charger controller to prevent over charging being an issue.
Thank you for your question, I believe the easiest way of doing this is to power cycle the board (this basically just means switch it off and on again) As this should reset the pairing if the devices it is connected too are not in range or are also switched off. You can either use the provided switch or you could add a push button switch to interrupt the power to achieve the same effect.
Thank you for your question, I would not recommend it as you would need to SMT mount the wire to some of the pins on the board before the amplifier as a custom job.
Thank you for your question, they are all back in stock this afternoon.
Thank you for your question, realistically no. With most products they will draw the amount of current they need from a power supply. So even if you have a 3A power supply the kit will draw less than 1A.
The time you are more likely to damage something is when you do not have enough current as the kit trying to draw more current than is possible can cause damage.
They can be in close range without damage however, there is every chance that you may experience some interference.
Thank you for your question, provided the JST plug on the battery is identical to the one on the 1000mAh battery we supply this should be fine. It would just have more current available and the kit would draw the current as required.
Thank you for your question, so the short answer is it is complicated.
The longer answer is that the Ohms of the Speaker is basically their resistance. 4 Ohm speakers draw more current than 8 ohm speakers if they were electronically the same otherwise. This means you can run an 8 ohm speaker well from a lower wattage amplifier.
Watts of the Speaker and amplifier also play into audio quality a bit but are more relevant for the top end volume and power consumption.
What is most relevant is the Sensitivity / Mean Sound Pressure Level / SPL / Volume Response ( It gets called a lot of things). This will basically be a value that will look something like 1W/1m 94 dB. The bigger the number in front of the dB the better as the speaker is more sensitive.
Hope that helps!
Thank you for your question, we do sell them on the link below, our product code 4154.
Thank you for your email, we have finished our latest batch today so should be available to buy tomorrow.
I was hoping to receive also some insight into the speaker box volume or dimensions but there was nothing. Is there some recommendation for a sealed enclosure for the 100mm 20W 8ohm speakers? I plan to build these speakers into 1960s vintage Bang Olufsen speaker boxes.
Thank you for your question. So I would strongly recommend using both speakers. Because of how stereo amplifiers work they divide up the sound file and send it through separate speakers. If you only had one speaker you would lose a portion of the sound file. How much this would be would depend on how the sound file is mixed but you are best off using both speakers or if you only want one speaker buying a mono amplifier.
Thank you for your question, you would need to purchase the power supply separately to this kit. If you wanted it to be powered by a rechargeable battery I would get the 4652 polymer lithium battery for £4.25 ex VAT. This would plug into the JST connector on the board. You could either charge this separately if you already own a lithium charger or you can connect a micro USB such as is commonly found in phone chargers to the micro USB port and this will charge the Lipo battery while it is plugged in.
If you bought the most expensive variant of the kit 2160-B along with the lipo battery this would be 34.25 ex VAT or £41.10 inc VAT.
Can a larger capacity than 1000mAh Li-Po battery be used with this kit? And can it then be charged via the micro usb port? In my country (Estonia) I have only seen 3.7V Li-Po batteries that are only 400mAh or 1200+mAh. I'm worried the capacity of the 400mAh isn't enough
The only issue you might encounter is you need to make sure the JST for your battery is also a 2mm JST as otherwise it will not fit the socket on the board.
A 1000mAh LiPo battery can provide up to 28 hours of continuous operation at normal volume. Obviously these are then rechargeable.
Hi Jerry, The kit hasn’t been designed to enable a volume/mute control feature to be added as this could all be done from the device that is connected to it. It would be quite difficult and complex to alter the kit to enable you to reduce the overall gain as such we don’t recommend trying to alter the kit to do this.
Hi Fergus, You could technically add a third speaker by connecting it in parallel or series with one of the other speakers. However you need to ensure the impedance doesn’t go below 4 ohm’s and is the same as the other output. For instance, if you had an 8 Ohm speaker on output 1, you could connect two 4 Ohm speakers in series to output 2 giving a total impedance on 8 ohm’s on that channel. If you wanted them in parallel you would use two 16 Ohm speakers. If you were wanting to add a third channel to the kit it wouldn’t be possible as it is a two channel amplifier.
Hi John, without knowing the reason for wanting to add a potentiometer it is difficult to say. However it is likely that it may not be simple to alter the kit, as such we wouldn’t recommend making changes to the kit.
Hi Morgan, The weight of the kit by itself is approximately 25g, if you went with an option with speakers it would weight more depending on the speaker type you picked.
Hi Shivam, Did you mean does it come with speakers? This product has three possible buying options, without any speakers would be product code 2160, with 65mm speakers would be product code 2160-A, and with 100mm speakers would be 2160-B. If you scroll down on the product page there is a table showing the buying options, it can be found past the photos and product description, just before the dimension information.
Hi Noah, The board hasn’t been designed to allow you to do this, as such you would have to modify the board to allow a microphone to be added, even then the Bluetooth module hasn’t been programmed to work the same as a hands free device.
Many thanks, Steve
Hi, i would just like to follow up regarding the below. I have now been informed that unfortunately the output can't be fed into anything else even if attenuated. This is because it uses a differential output and not a line out style output. I apologise for any confusion caused.
Hello Jeroen, We have tested the kit here and it can handle 10 meters, with a wall as an obstacles, however certain conditions may reduce this range and 10 meters did appear to be the limit before it started to loss connection.
Is this available yet or just out of stock?
Hi Dave, We are currently processing the first build of this kit and are looking at placing a small number into stock in the next day or so. We will then finish the build and add the remaining stock in the near future.
Hi Richard, those are the only two items that would requiring soldering, all the other components are pre mounted onto the board.
Hi Chris, as this is a Bluetooth amp kit you wouldn’t connect an iPod lead to the kit, you would connect via Bluetooth. This kit should be available in stock in the next few days as we are just finishing the first batch of manufacturing.
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