I put together a pcb using a TI TPA3110D2 audio chip. The board works fine, sounds good. I'd like to start playing with filtering circuits and tried putting together a simple low pass active filter on my solderless breadboard. The output signal from the active filter looks okay. But when I feed that signal from the breadboard into my TPA pcb, the chip looses it's mind. Nasty sounds without signals, and hard pops when removing power. (it TI chip works perfect if I just input both channels from the iPad)
I was wondering if it had something to do with the filter cap already going into the chip? That would be C4 on the drawing attached. Did that low pass circuit create a bandpass or notch filter? I questioned how the grounds work being on two separate boards as well.
If anyone is bored enough to throw some knowledge my way with this, I enjoy learning this stuff..
I appreciate your time, thanks!
I was wondering if it had something to do with the filter cap already going into the chip? That would be C4 on the drawing attached. Did that low pass circuit create a bandpass or notch filter? I questioned how the grounds work being on two separate boards as well.
If anyone is bored enough to throw some knowledge my way with this, I enjoy learning this stuff..
I appreciate your time, thanks!
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