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I am going to be wiring up a custom circuit. Audio is output from two LR audio cables. I am going to wire them up to two mini speakers, one for each LR cord. But how do I add in a part to detect if headphones are plugged in so instead of playing audio from the speakers it would play to the headphones that were plugged in?

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  • \$\begingroup\$ Old headphone jacks have contacts that detect when the headphones are plugged in . \$\endgroup\$ – Autistic Nov 18 '15 at 19:29
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Headphone jack sockets include switched contacts for exactly this purpose. See this schematic of a headphone socket:

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So you would connect your source to pins 2 & 3, and your speakers to pins 4 and 5. As soon as the headphone is plugged in the speakers are disconnected.

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  • \$\begingroup\$ Where can I buy one of these sockets to connect it up? \$\endgroup\$ – butenhjo2018 Nov 18 '15 at 16:34
  • \$\begingroup\$ Depends where you are. Look up stereo headphone jack sockets on Google, 3.5mm are the most common size - used in phones etc. Hi-fi headphones use 1/4" 2.5mm also available, but not often used. Common suppliers are: arrow, maplin, rs components. Farnell, element 14, or digikey. \$\endgroup\$ – Icy Nov 18 '15 at 18:07

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