PT8211 headphone out?

bmo

Member
Hi folks, pretty new to working with line level vs headphone levels.

I'm wondering what I'd need to do to get a good volume controllable headphone signal out of the line out signal from the PT8211.

Could I use something like the MAX9722A after the line out signal to get a reasonable headphone signal and then tune the gain with a potentiometer for volume control?

https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9722-MAX9722B.pdf

Maybe there is something even simpler with a simple op-amp circuit?
I'm trying to keep things to a single supply 5v source.


Thanks!
 
Yes, MAX9722A looks like it should work. Use 5V to power it.

You'll probably want to use a dual pot with audio taper as a volume knob for one of the resistors on each channel. Probably set the max gain to about 1.0 to 1.5, since the PT8211 has 2.5V peak-to-peak output.
 
Thank you so much for this info!

Here's my schematic for reference, we'll see how things work :)
Screen Shot 2023-06-11 at 4.48.29 PM.jpg
 
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