Audio a/b/c/d Switch for 3.5mm

I needed a way to switch the audio inputs to the speakers in my living room between the TV, phone, etc. After seeing 3.5mm (stereo miniplug) A/B switches online that cost between $25 and $40 — not kidding, look it up — the sensible thing to do was to make my own for about $8 (with 2x the capability).

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