it's the first time I encounter this in a schematic, and I'm wondering at how to reproduce this in Eagle.
So first number 1. As per description, the volume pin is "Internal Gain Setting Input Connect to VDD which Set Max. Gain = +20dB ", this is the first part I didn't get along with that schematic symbol. Do I have to connect a button there? If so, how to connect a pair of buttons to increase/decrease volume? My educated guess is that it means it's a potentiometer? (Maybe I could use a digital pot here then if that is really the case)
Now, number 2 seems to me even more strange, there isn't a node connecting the lines, and again that arrow. Is there a button here again to switch modes from BTL to SE? (If that is even possible to be switched like that...) and as the arrow goes through, is it still a pot? What is that? Also it's description is "Output Mode Control Input High for SE Mode and Low for BTL Mode ", so it pretty much is a pot right?
Thanks everyone! Tried to be as clear as possible here, let me know if I forgot something.
PAM8900's datasheet here:
Looks like BTL are speakers and SE are headphones, so how exactly is that part of the schematic going to be hooked up to choose between the two of them? At first I thought that simply by hooking up the headphones the IC would switch to SE mode...
I think I may be overthinking this, would a simple jack like this and the PAM 8407 I was using do the trick of disconecting audio from speakers?