I built a audio amplifier with lm386 .i have to total working circuit running. now i want to add a 3.5mm port to my sounddbox

jyotisoftwares · Jun 30, 2015

I built a audio amplifier with lm386 . i have to total working circuit running. now i want to add a 3.5mm port to my soundbox .
I need the circuit diagram so that when i successfully connect the port with the sound box and when my earphone is plugged in, the sound from sound box is switched off automatically, whih gets activated upon removal of earphone.

americanaudiophile · Jul 3, 2015

You need a specific kind of 3.5mm headphone jack that will interrupt the ground to the speakers. These are not as common as they once were. There needs to be an additional pair of connections that are normally closed and are open when the headphone is inserted.
This breaks the common ground connection for both speakers when the headphone is inserted.
If you can't fine one just use a switch instead.

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I built a audio amplifier with lm386 .i have to total working circuit running. now i want to add a 3.5mm port to my sounddbox

jyotisoftwares

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americanaudiophile

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