Can USB port be used to provide constant voltage out?
Answered
Hello,
I'm thinking of buying a node 2024 but want to ensure I can turn my amp on and off with it. My amp is an old Denon, sounds great but has no trigger in's and the power uses a latch switch, therefore could be left in on position. I looked at the Iot Relay but it seems to require a constant voltage to keep the relay on. I would assume the trigger coming out of the node is only a pulse therefore wouldn't work.
I thought the USB port might work that it could provide constant voltage to the relay but only if the usb turned on and off as the node came out/in of standby. I would appreciate any thoughts on this or if anyone has solved the problem else wise.
As a general note, this should be a use configurable feature in bluOS where one can send a pulse or constant power. I imagine there are many others out there that have spent thousands of dollars on vintage amps and won't use something like a node because they need to turn the amp on and off manually.
Thanks,
RP
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Official comment
Hi Remo,
The USB port for the NODE is not designed for your use case scenario. Unfortunately, you will have to manually turn on your third party amp.
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I get it's not designed for that but a little less cryptic answer would have been appreciated. Customer support is supposed to be about helping customers, not jet reading spec sheet.
How about this: "hey, I can understand how someone might not want to sell their highly invested equipment nor want to go downstairs to fire up the amp. Maybe I'll add this as a feature request with a couple options:
1) User settable trigger to allow a pulse or constant voltage
2) Maybe allow integration with HomeKit or Google home, etc where the node can trigger a smart switch and turn on the amp."
Is this too much to ask for?
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I think you could use the trigger out on the Node to a trigger relay that will provide mains power to your amplifier. These modules cost around 10 €.
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Thanks for your reply. The models out there all require constant voltage since the they are not a flip flop type relay. In other words, it would just turn it on and off within a second.
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Some time ago I asked in this forum whether the trigger was pulsed or continuous. One member of this forum stated that the trigger was continuous and the answer was marked as an "official comment", so I guess it was vetted by Bluesound. (https://support1.bluesound.com/hc/en-us/community/posts/19771224917911-Trigger-out-Node2-N110)
Even if the trigger were pulsed there are plenty "bistable" or "pulse" trigger relay modules out there, try that in a search.
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Thanks for your reply.
I really don't understand how vague some of Support's answers are. If in fact the 12v trigger is constant, why wouldn't Support just state that in my OP. The answer implies that it's not a constant voltage. There is also no spec anywhere that clears that up. I guess I have to wait for mine to arrive and test it myself.
Regarding bistable relays, they are plentiful on the market as just relays, but not in finished products like a triggered outlets. All the outlets or power bars I'be been able to find are constant voltage.
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Responses by BS are sometimes utterly inconsistent, confusing and obscure
1. Alain's link above shows an official comment saying it is constant.
2. Link below shows a BS comment saying it is a trigger.
https://support1.bluesound.com/hc/en-us/community/posts/26548007929751/comments/28327528214423
Only thing I can confirm is constant 12V on Node 2i, measured by multimeter. The 12V drops to 0 after not being used for 15 minutes.
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I use trigger out on my 2i and can confirm what Pinot says above - it is constant, not a pulse.
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