I'll try to set this up neatly;
- [BAT] 3.7V Lithium Battery (freshly charged to 4.2V, capacity is almost 10Ah)
- [AMP] LM386 Based 200 Gain Audio Amplifier (input is 5~12V, schematic)
- [VUP] Voltage Boost Converter (amazon link, datasheet for a similar board)
- [BLT] Bluetooth Audio Board Thing (input is 3.7V, sourced from some random cheap chinese earbuds, can't find the board or a schematic anywhere)
Colorful diagram thingy of setup:
As you can see, the battery is wired to the input terminals of the voltage booster [VUP], and also to the bluetooth board [BLT]'s power inputs. The voltage booster [VUP] is set to output 12V, and is wired to the amplifier [AMP]. The audio output of the bluetooth board [BLT] is wired to the audio inputs on the amplifier [AMP].
This results in an amplified audio signal on the unwired terminals on the amplifier [AMP].
When both [AMP] and [BLT] are on the same source –– [BAT] ––– the bluetooth board [BLT] gets really hot, has pairing problems, and/or powers on and off and restarts (I haven't yet gotten any audio playing at all through the full setup).
I've tested them in every other scenario where they aren't on the same battery, and they work PERFECTLY fine, even together.
Some modifications to the setup I've tried testing that work:
- Take out [BLT] entirely, and just wire a 3.5mm jack to [AMP]'s audio inputs, and plug the jack into something. (no bluetooth, but amplified)
- Take out [AMP] (and/or [VUP]) entirely, and connect test speakers to [BLT]'s audio output instead of [AMP]'s. (bluetooth, but not amplified)
- Disconnect [VUP] and [AMP] from the 3.7V [BAT], and connect it to a separate spare 9V battery, so that the power sources of [BLT] and [AMP] are completely separate (bluetooth AND amplified, but it needs two batteries instead of one)
Do I have to somehow "split" the power coming from the battery into two distinct sources? How would I go about doing this?