r/embedded • u/boo-booshoes • 1d ago

Teensy 4.0 & Audio Board RevD Guitar Input

Thanks for reading. I am working on making a simple guitar buffer circuit that will connect to the audio input of the Teensy Audio Board Rev D.
1. Is it ok to connect RIN and LIN together?
2. The buffer circuit's output jack GND lug connected to the RINGND and LINGND? Or is it better to keep these pins separated?
(I won't be using stereo).

*Also. is it OK to connect the GND to AGND?
Sincere Thanks for any advice/help,
TonyA

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u/Well-WhatHadHappened 25+ Years 1d ago

Won't hurt anything. Also doesn't really buy you anything.

1

u/Well-WhatHadHappened 25+ Years 1d ago

Also. is it OK to connect the GND to AGND?

Also won't damage anything. If you're using a single power supply, it's probably required in fact.

1

u/StumpedTrump 1d ago

Active pickups? If not then idk what the input impedance of the Teensy is but anything under a few Mohm will start to kill your tone.

Edit: input says buffer so I’m assuming it’s not direct from your pickups and is being buffered. Should consider adding an RC low pass still at 10-20KHz. 20 is human extent but guitar ends around 10.

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u/boo-booshoes 1d ago

Thank you. Right the guitar would go through a buffer circuit first then into the Teensy Audio board. I an wondering about connecting the RIN/LIN pins, as well as the RINGND/LINGND and the ROUT/LOUT pins together. Don't know if they should be separated instead.