How does the DAC/amp circuit behind a headphone jack detect

Question

How does the DAC/amp circuit behind a headphone jack detect

that a device is plugged in? At first I assumed that it would be the impedance of the device (e.g. 32 ohm for my Samson SR850), but then I modded the cable on that thing and made an interconnect in between the headphone and the audio jack with DuPont jumper wire connectors. When I connect just the wire to the audio jack, it is detected. However, when I disconnect the headphone from the wire, that is not detected. Maybe it's something with the rings on the headphone jack temporarily shorting while it's being connected/disconnected? There isn't much else I could possibly think of to be honest.

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31.10.2023

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SirJoe
Some jack sockets have an additional pin that i no...

Thank you for the reply! This could be the case yeah. How common is this though? Usually I see jack plugs fitted with only 3 contacts to the board — tip (left), ring (right), and ground. For jacks that have microphone functionality, part of the ground is split up into yet another ring for the microphone signal. I have yet to take my laptop for its next internal cleaning where I'd have the opportunity to observe its headphone jack arrangement, which could still take a little while. And my iPad Air 2 that I used for some of my observations is.. well, let's just say that I don't want to even try to disassemble it. Thank you Apple for making your devices that repairable. Anyway, the observations were consistent across both the laptop and the tablet, so they must use something common. I wonder what that common method is...

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01.11.2023

SirJoe · Accepted Answer

SirJoe

Some jack sockets have an additional pin that i normally connected to gnd and it disconnects when you insert a plug

0

31.10.2023

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How does the DAC/amp circuit behind a headphone jack detect

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