Phillips Speaker
Philips Fidelio SoundAvia Wireless Speaker - AD7000W/37
Objective
The sound from this speaker is amazing and I wanted something more portable with great sound. So, a few years back I wired in a USB bluetooth receiver and added lithium ion batteries to this speaker to make it portable and bluetooth enabled.
I ended up powering it with a 2S2P battery pack for a power output of around 3.7v x2 ~= 7.4v
After using this for a couple of years, I noticed that sometimes the bluetooth would not connect. My current theory is that the voltage eventually gets too low to power the USB. I think this is because I opted to to power it with only 7.4 volts.
I think it is time to update this speaker with a 3S2P battery pack for a voltage of about 11.1v which should give it the longevity it deserves. The upper voltage would be 12.6v while the low voltage would be 6v.
Power Consumption
Idle | 19 mA |
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Running | 260 mA |
Bluetooth Module
- 【Upgraded Bluetooth Adapter】: High Bluetooth V5.0 makes your non-Bluetooth devices Bluetooth-Enabled, easily transmit audio wirelessly. It's compatible with a variety of Bluetooth devices.
- 【Low Delay】: With aptX lantency technology, this adapter provides fast, stable and smooth transmision without audio delay. You will get a rich and clear sound experience and enjoy comfortable audio-video synchronization.
- 【2-in-1 Function】: Transmitter Mode: Plug into your non-Bluetooth device like TV, PC, CD player, MP3/MP4 and pair to your Bluetooth speakers and headphones. Receiver Mode: Plug into your non-Bluetooth Home/Vehicle Sound Systems and pair to your smart phone.
- 【Plug & Play】: Mini Bluetooth adapter, no need any drivers, plug in the USB port to use. One-button switching mode, red light for transmitting mode, blue light for receiver mode.
- 【USB Power Supply】: Charge it on the USB port, never worry about running out of power when you use it. Enjoy 1 year warranty.
I confirmed that the last mode is preserved after powering off/on.
Current Pictures
Revision
The biggest problem with updating the battery will be space but we CAN DO IT!
Battery Build
We are building a 3S2P 11.1V (12.6v Max) Lithium Ion battery.
Testing shows a capacity of 3.20Ah or 33.77Wh.
Question: Can we safely charge this with our 14.6v 20A Charger?
Answer: No, charger toggles between charge and standby and battery shows 13+ volts.
Perhaps we can add a voltage regulator with the output set to about 12v?
BMS
Module name: 3S 12.6V Li-ion Lithium Battery 18650 Charger Protection PCB BoardSuitable range: For nominal voltage 3.6V 3.7V lithium battery(Including 18650,26650, lithium polymer batteries)
Specification | Value |
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Charging voltage | 12.6V |
Maximum output current | 20A |
Maximum output power / charging power | 252W |
Low Voltage Disconnect | 9V or 3V/cell |
Size | 59 x 20 x 3.4mm |
Installation
And voila, all done and running on battery and it sounds amazing!
References
Reference | URL |
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User Manual | |
Service Manual |