What's the 100 ohm resistor doing?

Hi @robertCM

What’s that 100 ohm resistor (R6) doing? I get it’s controlling the current through the stereo jack but why is that needed? Will add your answer to the notes I publish for the components.

hey @mike.egner, I was drawing the schematics for MAKERbuino.

The resistor is simply needed to limit the maximum volume supplied to the headphones. In other words, the headphone output was too loud when I first made the circuit on a proto board and that’s why I added a 100ohm resistor to limit the volume.

Hope this helps :slight_smile:

1 Like

Brilliant, thanks @albertgajsak. I did some thorough reading on these kind of circuits and there’s so much variation out there and no clear rules / best practices so I was stumped. Thanks for this.

1 Like

No problemo! :slight_smile:

Well, there are some rules, but you’d be surprised by how empirical hardware development actually is :slight_smile:

1 Like