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USB host port as 12v trigger 2 years 10 months ago #46012

  • Ultrasonic
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The idea came from several messages earlier in this thread.

I know :) .

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USB host port as 12v trigger 2 years 3 months ago #50155

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Does anybody know if this was ever implemented? Does the USB port turn off when the SHD switches to standby? I haven't purchased yet, and I really need a 12V trigger option, and this seems like a smart way to do it. Just voltage to go high and low, nothing fancy, my amp will work with as little as 3.3V.

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USB host port as 12v trigger 1 year 10 months ago #53452

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would be a great feature, many have a 12V trigger on their power amp (I know I have B) )

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USB host port as 12v trigger 1 year 10 months ago #53470

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My new SHD turns off the USB Host power in standby but others do not with the same base software.
Though, I have a newer version of Volumio 1.073 from December 16th 2020.

SHD firmware 1.15 firmware 1.21.

- Rich

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USB host port as 12v trigger 1 year 7 months ago #54902

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I've been trying to use the USB port as a trigger. I've got a 5v cable (my amp says it will work 5-12v), however when the 5v cable is plugged into the amp it stays off all the time. If the SHD is on with music playing, if I plug in the cable, it turns the amp off!

Any suggestions? Is it worth buying a 12v cable to check that's not the problem?

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USB host port as 12v trigger 1 year 7 months ago #54911

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what do you mean with "5V cable" or "12V cable"?

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USB host port as 12v trigger 1 year 7 months ago #54917

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My electrical knowledge is very limited but it seems there's a difference between a USB to 3.5mm cable and the voltage it carries.

Like this for example

www.amazon.co.uk/dp/B01F1VT2X8/ref=cm_sw..._encoding=UTF8&psc=1

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USB host port as 12v trigger 1 year 7 months ago #54919

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USB by itself is 5V, so a simple cable will give 5V
there are cables with a "step-up converter" like this one

and in addition to the voltage, there is the current draw, does the amp manual say how much current (in A or mA) it will draw? if that is more than the USB port can supply, it will not trigger

just to be sure: the plug type the amp expects is the same as the one on the cable?
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USB host port as 12v trigger 1 year 7 months ago #54926

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Thanks, I've ordered the setup cable to give that a try. The amp is a Audiophonics built hypex ncore nc252. Not much info on current from Audiophonics but the amp module has a lot of data I don't understand here!

www.google.com/url?sa=t&source=web&rct=j...ttc-47xExloKiGvGGFG9

Will report back with the new cable test

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USB host port as 12v trigger 1 year 7 months ago #54927

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Power Supply Enable needs a voltage between 3.3V and 12V so 5V from USB should be fine.
Current consumption will then be (5-0.7)/22000 A, or around 0.2mA which is well within USB capabilities.

You do need a newer SHD for USB to be turned off in standby though.
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Last edit: by entripy.

USB host port as 12v trigger 1 year 7 months ago #54928

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You do need a newer SHD for USB to be turned off in standby though.


Has there been a recent hardware change that addresses this? I bought mine about 8 months ago, but no idea on the manufacture date.

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USB host port as 12v trigger 1 year 7 months ago #54929

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You do need a newer SHD for USB to be turned off in standby though.


Has there been a recent hardware change that addresses this? I bought mine about 8 months ago, but no idea on the manufacture date.


www.minidsp.com/forum/shd-series/18512-n...sion-hardware-update

The relevant part being:
Is it true that you have determined that the Neo2 units cannot also do the same standby behavior via firmware update? As you know, many of us have been desperate for a 12V trigger solution.
ANS: Unfortunately we can't turn off power to the USB port on the Neo2. We are still thinking of a way for this trigger option but don't have a magic solution. We do not want to state something here until we have a solid/proven solution. Thanks for your patience.

Which if I'm understanding it means it won't work for you.

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USB host port as 12v trigger 1 year 7 months ago #54930

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You do need a newer SHD for USB to be turned off in standby though.


Has there been a recent hardware change that addresses this? I bought mine about 8 months ago, but no idea on the manufacture date.


www.minidsp.com/forum/shd-series/18512-n...sion-hardware-update

The relevant part being:
Is it true that you have determined that the Neo2 units cannot also do the same standby behavior via firmware update? As you know, many of us have been desperate for a 12V trigger solution.
ANS: Unfortunately we can't turn off power to the USB port on the Neo2. We are still thinking of a way for this trigger option but don't have a magic solution. We do not want to state something here until we have a solid/proven solution. Thanks for your patience.

Which if I'm understanding it means it won't work for you.


That sucks, my SHD is from December 2019. Really desperate for a 12v trigger, or even a 5v trigger! I’ll double check on Friday wether the usb outputs even in standby, just to make sure. Got my fingers crossed..

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USB host port as 12v trigger 1 year 7 months ago #54937

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Thanks, I've ordered the setup cable to give that a try. The amp is a Audiophonics built hypex ncore nc252. Not much info on current from Audiophonics but the amp module has a lot of data I don't understand here!

www.google.com/url?sa=t&source=web&rct=j...ttc-47xExloKiGvGGFG9

Will report back with the new cable test

I have that same amp and I'm using the SHD to trigger it via USB, I made the cable myself. So far it's been working flawlessly, I have a Neo3 revision of the SHD (blue USB host socket).
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USB host port as 12v trigger 1 year 7 months ago #54976

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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.

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