Gnd problem please help me

paldep

Member
2016-03-18 3:33 pm
Hi guys, i'm new to the forum.
I have some problem to Connect this device with one single battery. I think the problem is on the connection of the max4466 electret. It has a common ground and it make me impossible the connection with the pam 8403 that have separate ground. Audio- and battery -. How can i Connect it properly? Maybe a diode? i attached an image. when i use these chips with two different batteries it works very well. Please help me
 

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paldep

Member
2016-03-18 3:33 pm
Sorry guys. Unfortunately it seems that gndin and gnd of the pan8403 are not equipotential. The electret has 3 pin vcc out and gnd.. The pam 8403 has leftin gndin rightin and + -. If i Connect gndin and -, pam8403 stop to work. If i Connect the electret amplifier i have to Connect gndin - and gnd of electret. And it doesnt work Like that.