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Overview
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.
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Power consumption recording while idle and while listening to some tunes.
Off ( ToggleMomentary Switch) - disabled now | 15 mA / 0.19w |
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| Idle | 30 mA / 0.38w |
| Running | 280 mA / 3.5 w |
Off Time (33.8Wh / 0.19 W) | ~7.5 days |
Standby Time (33.8 Wh / 0.38 W) | ~3.5 days |
Run Time (33.8 Wh / 3.5 W) | ~9.5 hours |
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I confirmed that the last mode is preserved after powering off/on.
Pictures
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of Initial Conversion V1
Revision V2
As part of this revision, we are going to add a bigger battery to the speaker.
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Perhaps we can add a voltage regulator with the output set to about 12.6v ?
When using the supplied AC/DC wall plug (output=12.2v), the buck converter outputs about 11.5v. This is above the nominal voltage which should still charge the battery.
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And voila, all done and running on battery and it sounds amazing!
Revision V3
Going to rework this so I don't need the buck converter or I replace the buck converter with a buck/boost converter.
At present it doesn't seem like it is charging to full capacity with the buck converter. Could also just be the battery level monitor. We shall see.
I opted to use a buck boost converter. Tested it out and it holds the voltage steady with varying input voltage. Seems like it is the best option.
Buck/Boost Converter
https://www.amazon.ca/gp/product/B0CCHPPKW4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
XL6009 buck boost converter
- With automatic voltage boosting and bucking function.
- ⚡【Input Voltage】：3.8~32V.
- ⚡【Output Voltages】：1.25~35V.
- ⚡【Input Current】：3A (max), no load 18mA (5V input, 8V output, no load less than 18mA. The higher the voltage, the higher the no load current.)
- ⚡【Conversion efficiency】：<94% (the higher the differential pressure, the lower the efficiency)
Wiring
Using Buck/Boost Converter
Additionnel Changes
I also cut the power toggle trace since I always seem to accidentally hit this. When powering on with the switch, the unit defaults to always power on.
I also ended up replacing the speaker connector since it broke apart.
References
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| User Manual |
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| Service Manual |
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