It has 5V stepdown converter and Li-Po charger as well as amplifier integrated on board. Cheap USB-C Li-Po chargers lack neccessary 5.1kOhm pull-downs and therefore work only with USB-A->USB-C cables. Soldering them onto charger PCB is borderline impossible, while adding them to most USB-C sockets is fairly easy (usually there are free pads to solder 5.1k SMD resistor). You then connect 5V and GND from USB-C socket to BT module and it handles charging the battery that is connected to separate pads.
I don't really understand why article recommends board without amplifier, I tried using CSR8675 board without one and it was waaay too quiet.
With 500mAh battery salvaged from old BT speaker I get over 20h of loud playback, which is fine for me.
I don't understand why article recommends board without amplifier, I tried using CSR8675 board without one and it was waaay too quiet.
It depends on the drivers; if they're low impedance, the result may be deafeningly loud. Yours seem to be available in 32, 80, and 250 ohms, the ones in the article are 32.
Thinking of doing a similar mod to my shp9500. Have you tried pairing this with an android phone yet? I'm also curious how it sounds on aptx instead of aac.
It has 5V stepdown converter and Li-Po charger as well as amplifier integrated on board. Cheap USB-C Li-Po chargers lack neccessary 5.1kOhm pull-downs and therefore work only with USB-A->USB-C cables. Soldering them onto charger PCB is borderline impossible, while adding them to most USB-C sockets is fairly easy (usually there are free pads to solder 5.1k SMD resistor). You then connect 5V and GND from USB-C socket to BT module and it handles charging the battery that is connected to separate pads.
I don't really understand why article recommends board without amplifier, I tried using CSR8675 board without one and it was waaay too quiet.
With 500mAh battery salvaged from old BT speaker I get over 20h of loud playback, which is fine for me.
[1] https://www.reddit.com/r/headphones/comments/r32ru2/yet_anot...