Does anyone know where I can find a DIY power supply with remote trigger input(s)?
I need a PSU for my subwoofer. I want it to be triggered on when I switch-on a TV, an android tv-box, amplituner or a satellite receiver. That is at least four trigger sources.
It would be best if it had different trigger inputs like HDMI, USB, 5V jack, 12V jack, audio signal sense, etc...
It can be just the control board with trigger inputs and a mains relay output, but it can also be a complete power supply: the trigger board and a high power supply board with soft start etc...
I need a PSU for my subwoofer. I want it to be triggered on when I switch-on a TV, an android tv-box, amplituner or a satellite receiver. That is at least four trigger sources.
It would be best if it had different trigger inputs like HDMI, USB, 5V jack, 12V jack, audio signal sense, etc...
It can be just the control board with trigger inputs and a mains relay output, but it can also be a complete power supply: the trigger board and a high power supply board with soft start etc...
What if it only triggered when audio is present at the sub input? Are there times when you have audio there but don't want the sub on? (Do you really need the other modes?)
I don't really see any ready-made solutions, but you could cobble something together pretty easily using an Arduino and a relay module. That's about the only efficient way to have such a wide range of custom trigger sources.
I don't really see any ready-made solutions, but you could cobble something together pretty easily using an Arduino and a relay module. That's about the only efficient way to have such a wide range of custom trigger sources.
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Is there an off the shelf solution for what you are trying to do? I am going to say probably not. If you want to shop for a product, start with the A/V (the people that sell conference room equipment, projectors and screens, pan and tilt cameras, etc)
The challenge you face is that these days, I do not see where A/V components typically do not broadcast their On/Off status. The tricky part is identifying, understanding (and getting access) the different triggers you want employ. Once you understand how each of you audio components' trigger outputs (if they have one) behaves. They are either going from high to low or low to high. Once you understand the transition of a component, manipulating it and inverting (if needed) is basic solid state state logic.
If this was my project, I would start with seeing what I can do with the audio signal going into your subwoofer. It will take some experimentation and observation. You got an AC signal coing into your sub at exactly the same point our sub to turn on.
I would split off the audio signal, pass the split side through a buffer amp. (aka Op Amp) Pass the buffered signal through a gain amplifier, with lots of gain, in fact too much gain, so much gain we want the output to suffer from clipping. What does a heavily clipped signal out of an op amp look like? Direct Current, or a logic high trigger. You can take it from there.
You might have to do some conditioning of the signal, filter, rectification, etc I would add a sub delay-off stage. Once the sub is on, I want it to take some time to shut itself down.
Recognize that this proposed solution and be done with the most basic and inexpensive electronic components. El cheapo Op Amps resistors, basic capacitors, maybe a 555 timer. You should be able operate this on a single walwort.
The challenge you face is that these days, I do not see where A/V components typically do not broadcast their On/Off status. The tricky part is identifying, understanding (and getting access) the different triggers you want employ. Once you understand how each of you audio components' trigger outputs (if they have one) behaves. They are either going from high to low or low to high. Once you understand the transition of a component, manipulating it and inverting (if needed) is basic solid state state logic.
If this was my project, I would start with seeing what I can do with the audio signal going into your subwoofer. It will take some experimentation and observation. You got an AC signal coing into your sub at exactly the same point our sub to turn on.
I would split off the audio signal, pass the split side through a buffer amp. (aka Op Amp) Pass the buffered signal through a gain amplifier, with lots of gain, in fact too much gain, so much gain we want the output to suffer from clipping. What does a heavily clipped signal out of an op amp look like? Direct Current, or a logic high trigger. You can take it from there.
You might have to do some conditioning of the signal, filter, rectification, etc I would add a sub delay-off stage. Once the sub is on, I want it to take some time to shut itself down.
Recognize that this proposed solution and be done with the most basic and inexpensive electronic components. El cheapo Op Amps resistors, basic capacitors, maybe a 555 timer. You should be able operate this on a single walwort.
Yes. It is usually when the music is on. Sub is really only for films.
Well, in most cases they do not do that. And if they do, there is rarely a dedicated output. The on/off status is encrypted in some digital transmission over HDMI, ethernet or something else. My enigma2 satellite receiver does not have an output transmitting its status, neither has my android tv-box.
They do have USB and HDMI outputs, but not a 3.5mm jack with 0/5V saying "I am on". USB is not always a good indication that the device is on as usb may remain powered even if the deice goes to sleep.
I am looking for a solution that is for exmple in tv soundbars that triggers the soundbar on over HDMI when the tv is switched on. Detectig the signal at the analogue input of the sub is just one way of detecting the status but I would want to have the other ways too.
It is a diy subwoofer so I want to build the electronics myself too and if there was an open source slution I could modify it to my needs.
I have worked in both Broadcast Video and Commercial A/V industries. The A/V teams do lots of programming and automation. "When this display is on, do ABC, when the display is off do XYZ." In the case of a current flat screen displays, about the only to get "into" the display and interrogate the display's status is through the ethernet connection. And from what coworkers tell me, that little bit of code is hit or miss. It seems like it is kind of an afterthought and often the execution is poor.
Take as a given, you manage to figure out how to interrogate the display properly, and you get a valid "I am ON" or "I am OFF" response through your network. How do you turn that IP string response into a signal that your subwoofer recognizes as "Now turn on the subwoofer now" or "Turn off the subwoofer now" will reliably react reliably?
I get the attraction of whizz bang automation,. Pushing a single button and watching several A/V components SPRING into action and configure themselves exactly you programed. That is a challenge and fun stuff to get up and running.
I know this not what you are looking for, yet an extra remote you have hunt around and dig between sofa cushions just to turn on your subwoofers. UGH, who wants that?
https://www.amazon.com/dp/B09WZTK33T?ref_=undefined&th=1
Personally, I would just resign myself to the fact that a couple times each night, I have to go ever and turn on or off a couple subwoofers.
Take as a given, you manage to figure out how to interrogate the display properly, and you get a valid "I am ON" or "I am OFF" response through your network. How do you turn that IP string response into a signal that your subwoofer recognizes as "Now turn on the subwoofer now" or "Turn off the subwoofer now" will reliably react reliably?
I get the attraction of whizz bang automation,. Pushing a single button and watching several A/V components SPRING into action and configure themselves exactly you programed. That is a challenge and fun stuff to get up and running.
I know this not what you are looking for, yet an extra remote you have hunt around and dig between sofa cushions just to turn on your subwoofers. UGH, who wants that?
https://www.amazon.com/dp/B09WZTK33T?ref_=undefined&th=1
Personally, I would just resign myself to the fact that a couple times each night, I have to go ever and turn on or off a couple subwoofers.
Would one of the eco power strips do that? I remember seeing a good few years ago power strips that power up or down depending on another device going full power on vs standby, e.g. a TV.
Found a project on Rod Elliott's site (project 38) that might be helpful, at least for the detecting audio, and delay circuit for controlling a 12V relay. It would be pretty easy to interface digital logic to this, either combinational or from an Arduino, etc.