Hello
ISD1600B is a record and playback IC that also has internal amplifier so you can connect a speaker directly to it . And also has an output to drive an external amplifier.
The output is single ended current ouptut .
I have an external amplifier with PAM8403 (that GF1002 pcb) .
On the ISD signal output I have put a resistor to ground and fed the resistor's voltage to PAM4803 inputs.
When I connect these 2 ICs together, the audio is very low, worse than with internal amplifier.
If I fed signal from my phone to PAM4803, the volume is good, loud.
Power supply is both 5V
What are the incompatibilites between these 2 ?