Hi! So, I'd like to get some advices on how I could achieve such circuit that reverses the behavior of an NC 3.5mm front panel jack.
Most of you probably wonder why would I want this? Well, this is because, contrary to popular belief, most soundcards today use NO 3.5mm jacks, instead of the HD Audio standard of NC. And so did my case and SoundBlaster soundcard.
Now, the problem isn't obvious until one of those 3.5mm jacks breaks. And, lucky me, one of mine broke. So, I ordered from a local electronics shop some 3.5mm jacks. Obviously, those were NC, not NO. So, they worked the other way around: when I connected my headphones, Windows detected my headphones as disconnected, and when I disconnected them, Windows detected them as connected.
Now, I had a case in my attic that also had some NO jacks, so I took those and replaced my broke jack. All good and dandy, until you realize those NO jacks don't have a way to ground your 3.5mm stereo connection, which is unbalanced. So, noise happens to slip in. And, lucky me, my older, not very sensitive to sine waves, headphones broke too, so I bought a pair of JBL Tune 500, which were far more sensitive. So, that nice noise is now in my ears, as the ground doesn't exist on these NO jacks (as their exterior is made out of plastic, and not out of aluminum or some other conductive metal).
Leaving the story behind, I want to make a circuit to reverse that NC behaviour, or better said, make a circuit on the HD AUDIO cable, such as my SoundBlaster understands NC as the normal jack and NO as the reverse, unstandard jack. I was advised to look into 5V SPDT relays, but I can't figure out a way to power that electromagnet in them.
Now, the final question, how can I power a 5V SPDT relay using connections found in the PC? I'd prefer using connections found on the front panel cables (soundcard 5V, USB 5V, USB GROUND) and not PSU connections.
Most of you probably wonder why would I want this? Well, this is because, contrary to popular belief, most soundcards today use NO 3.5mm jacks, instead of the HD Audio standard of NC. And so did my case and SoundBlaster soundcard.
Now, the problem isn't obvious until one of those 3.5mm jacks breaks. And, lucky me, one of mine broke. So, I ordered from a local electronics shop some 3.5mm jacks. Obviously, those were NC, not NO. So, they worked the other way around: when I connected my headphones, Windows detected my headphones as disconnected, and when I disconnected them, Windows detected them as connected.
Now, I had a case in my attic that also had some NO jacks, so I took those and replaced my broke jack. All good and dandy, until you realize those NO jacks don't have a way to ground your 3.5mm stereo connection, which is unbalanced. So, noise happens to slip in. And, lucky me, my older, not very sensitive to sine waves, headphones broke too, so I bought a pair of JBL Tune 500, which were far more sensitive. So, that nice noise is now in my ears, as the ground doesn't exist on these NO jacks (as their exterior is made out of plastic, and not out of aluminum or some other conductive metal).
Leaving the story behind, I want to make a circuit to reverse that NC behaviour, or better said, make a circuit on the HD AUDIO cable, such as my SoundBlaster understands NC as the normal jack and NO as the reverse, unstandard jack. I was advised to look into 5V SPDT relays, but I can't figure out a way to power that electromagnet in them.
Now, the final question, how can I power a 5V SPDT relay using connections found in the PC? I'd prefer using connections found on the front panel cables (soundcard 5V, USB 5V, USB GROUND) and not PSU connections.
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