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USB host port as 12v trigger 1 year 7 months ago #54977

  • kokoon
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Great to hear you've got it working (great setup isn't it!).

I've asked Audiophonics support if they can help. I wonder if something is wired backwards.

When I mentioned the usb-to-trigger idea to audiophonics rep via email, they were absolutely clueless and confused, don't expect too much help on that front.
Did you say the trigger is always hot, even when SHD is off? That would indicate that you have the older hardware revision, which doesn't turn off the usb... Is it white or blue, the usb socket?

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USB host port as 12v trigger 1 year 7 months ago #54978

  • Harryharryharry
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The usb port has a blue LED. It should be the latest version as it's only a month old..

Luckily I didn't mention usb to them, just that the trigger isn't working as expected.

When the SHD is on, and I plug the trigger cable into the amp, it turns OFF. If I unplug the trigger cable the amp comes back on...

So it's working, but opposite to what I want it to.

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USB host port as 12v trigger 1 year 7 months ago #54979

  • RichB
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The amp off indicates that the amp detected the cable and no current.
The premade cable did not work with my SHD.

I would just make your own, the tip is positive for most amps.

- Rich

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USB host port as 12v trigger 1 year 7 months ago #54985

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Just had a look at how to do that, seems straight forward enough even without any tools or electrical experience. I might start with opening up the cable I have, maybe the ground and + are the wrong way round for this purpose.

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USB host port as 12v trigger 1 year 7 months ago #54998

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For those with the Neo3 hardware, I can confirm that the USB Host port works beautifully with this step up cable and this mono connector to replace the barrel. Couldn’t have been easier to do. My dmm reads 12.7V at the mono jack and I assume it has plenty of current for the simple job.

For those with units before roughly Jan 1, 2021, RichB already pointed to the old issue of the USB port never turning off. The best you can do is insert an audio-sensing device like the Bobwire DAT1. You’d have the cost of the DAT1, and then would need to get a cheap SPDIF to TOSLINK converter on Amazon, and then the associated cabling. Obviously don’t use the DAC inside the DAT1, just send the coax digital out from the SHD into the DAT1 to trigger the 12V function and let the signal dead-end there.

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USB host port as 12v trigger 1 year 7 months ago #55000

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Thanks guys, Audiophonics support have been helpful. They helped me realise the cable I'm using although it's 3.5mm it's not an audio jack plug, so I'll need to replace it.

This is what I was using which didn't work. Will cut the end and splice with a 3.5mm audio jack and see if that works.

www.amazon.co.uk/dp/B077YTCQXD/ref=cm_sw..._encoding=UTF8&psc=1

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USB host port as 12v trigger 1 year 7 months ago #55001

  • RichB
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Most people have USB cables hanging around. It is the mono 3.5mm cable that is needed to build your own cable.
I ended up buying store 3.5mm trigger cables, tailed and USB female plugs. That allows using standard USB cables to adjust the length.

www.amazon.com/gp/product/B081JGZK14/ref...08_s01?ie=UTF8&psc=1
www.amazon.com/gp/product/B082VVPTN6/ref...00_s00?ie=UTF8&psc=1

Unfortunately, it is hard to find onesies so I have extras.

- Rich
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USB host port as 12v trigger 1 year 7 months ago #55002

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Right, unless the amp won’t trigger with something as low as 5V, in which case the step-up cable is necessary. NAD told me that 12V is the only acceptable voltage according to their C298 spec sheet so that’s what I’m using.

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USB host port as 12v trigger 1 year 7 months ago #55005

  • kokoon
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Right, unless the amp won’t trigger with something as low as 5V, in which case the step-up cable is necessary. NAD told me that 12V is the only acceptable voltage according to their C298 spec sheet so that’s what I’m using.

Yeah but the Audiophonics amp will definitely work, I have the same one and it works perfectly with the SHD's hacked USB trigger.
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