Hello,
Would need some help and pointers on how to approach to the power supply for the portable audio speakers I am trying to make...
The speakers will be composed from the d-class amp which (TA2024) which needs 12V, around 2A power supply, which I have solved via the laptop like brick smps I found lying around. Now, I am having some difficulties in finding a proper way to solve the portable part... I need some kind of a battery backup, but as the person who I am making this for is, well, a kid, I am trying to make it as simple as possible. Another words, I need a solution which will be in the sealed box with the speakers and an amp, and will charge the battery when connected to the above mentioned power brick. Now, I want it to be "smart", and that when the adapter is plugged in, it plays and it charges, and to sense when battery is charged, stop the charging and play on. When adapter is unplugged, it uses the battery power.
Now, my knowledge in this field is young and small, and I do not want to experiment a lot, so I would use some pointers. At first I opted for Li-on batteries, but all the drama on the internet with the explosions and so on, kind of scared me away. SLA is out of the question, as it is too heavy.
What would Your proposition be for the battery type, what to use as a charger (batteries not removable from the enclosure), how to solve a dc adapter direct - battery charging and protection circuit, is there some finished circuits of this type to buy (like in laptops for example)?
Many, many thanks for any help.