I have a small children's record-player. I'd like to modify it so that it can also play music from an SD card from my phone from the same speaker. After opening the device I see that the output from the needle which has two wires positive and ground goes into what I assume is an amplifier board. I have a SD card mp3 player board which has audio out that can be attached to speakers running at 5V. Should I hook this to the speaker in the player? or should I run it through the built-in board first?
Is the signal from the needle basically the same as the signal going to the speakers just softer?