My computer at work didn’t have a 1/4″ headphone jack, so I built simple box that did. It allows me to switch between headphones (1/4″ or 1/8″) or speakers. I also added a volume control for the headphones.
I was emailed by “Nathan” about how a simpler version could be wired that only had one headphone out, and didn’t have a volume control. Here’s a quick sketch for that.
Also, if you want the front always on, and only the back switchable. See the following.
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