Hey everyone! Currently I’m working on a project that looks

Question

Hey everyone! Currently I’m working on a project that looks

like this. It’s a modified USB hub with all its 4 ports broken out, as well as having its master (can we still call it that?) broken out into a micro USB board. Other than that, it’s currently 3 unwired audio jacks of which the center will be the master, split into the two side jacks.

Given this setup, and assuming that the same source device (a laptop for the sake of argument) will be used for both audio and USB.. is there any way to make an LED light up based on audio source device connectivity? USB has the power while the audio device has the signal. But neither can light the LED on their own in these requirements. Can you think of something?

Personally I’m thinking of abusing the impedance of the audio device as if it were a resistor, but that’d narrow the device compatibility. I don’t expect to run high power devices off this thing, 30-40ohm each would be my target. But still…

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11.02.2024

4 ответов

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Sharuzzaman Ahmat Raslan
Cannot understand the connection based on your des...

Thanks for the reply! I’m currently replying from my iPhone, so a schematic may be.. hard, to say the least. Apple really doesn’t like technical terms it seems. But roughly speaking, I intend to have my 5V positive connect to a resistor like usual, and then to one of the voice coils (Apple, calm down, last warning) to deliver the final resistance.. kinda like a potentiometer (if it were a dimmer) in the chain I suppose. Except in this case it’s a coil that makes up part of a headphone. The way I look at it is that it’s just another resistor we can abuse. While it can do its inductive magic, we can put its resistive properties to use. Granted, it would create distortion if only done from either left or right. For the final result to be something palatable to an end user, it may not be ideal.

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3 месяца назад

SirJoe

If you want to light an led when you have a jack connected, there are jack female connectors that have additional contacts that open or close to gnd when you insert a male jack

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3 месяца назад

Vim Автор вопроса

SirJoe
If you want to light an led when you have a jack c...

Oh, good idea! I remember you telling me about those previously. Maybe I should get some of those and then just light my LED through those contacts.

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3 месяца назад