- Tue Aug 21, 2018 12:29 pm
#200090
All,
I'm attempting to design and build an AM/FM tuner/amp board utilzing the Silabs Si4731 tuner, and TI TPA2016D2.
Long story short is I'm on my second PCB as I found the TPA2016D2 amp (class D) created a lot of interference in the FM range, and learned the need to add some ferrite beads on the amp output and power input...
Well, I thought this would fix things, but unfortunately it did not...even with the amp completely off, I'm observing poor reception (SNR values of mid to upper 20s).
I'm controlling this board with a Raspberry Pi 3, and my best guess is I'm getting interference/noise from the RPi. Any thoughts on this? I know that's a pretty broad question.
I tinkered with the Sparkfun Si4703 board in the past and had good luck with it connected to an RPi...I just noticed the Sparkfun Si4703 board has series resistors on the Si4703 inputs, whereas my design does not. Does anyone know if Sparkfun added these resistors (330ohm) to deal with this?
I'm attempting to design and build an AM/FM tuner/amp board utilzing the Silabs Si4731 tuner, and TI TPA2016D2.
Long story short is I'm on my second PCB as I found the TPA2016D2 amp (class D) created a lot of interference in the FM range, and learned the need to add some ferrite beads on the amp output and power input...
Well, I thought this would fix things, but unfortunately it did not...even with the amp completely off, I'm observing poor reception (SNR values of mid to upper 20s).
I'm controlling this board with a Raspberry Pi 3, and my best guess is I'm getting interference/noise from the RPi. Any thoughts on this? I know that's a pretty broad question.
I tinkered with the Sparkfun Si4703 board in the past and had good luck with it connected to an RPi...I just noticed the Sparkfun Si4703 board has series resistors on the Si4703 inputs, whereas my design does not. Does anyone know if Sparkfun added these resistors (330ohm) to deal with this?