Although i don't know anything about electronics i decided to build my first arduino project.
Only because i can see this absolutely great community that is involved and actively share knowledge
So thank you in advance for your help and have patience with this noob
Idea is simple. Play sound in house when someone open the door in back yard.
What i did so far:
Arduino uno R3 with MP3 player shield.
Amplifier is Y148.
I use one power source for both arduino and amp, 12v/3a.
I soldered wires on +/- barrel jack on arduino board and connected to +/- on amp (red/black wires)
Audio out from mp3 shield is connected to audio in by this brown mic cable. (I soldered wires to
appropriate pins in 3.5mm jack).
There are speakers connected and also relay switch as input.
However, the problem is this strange noise i hear that i can't identify...
It appears only when audio source is connected. Amp it self is really quiet without source in.
NO buzz or any other sound, other than some murmur when volume potentiometer is turned...
The sound is kinda higher frequency, not deep buzzing usually related to amp...
Also, it may work for say two days without any noise, than suddenly it appears.
I really don't know where to look. Please point me in right direction, but also be specific.
I don't know how to read schema... I can clarify more if needed.