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TOPIC: SHD + Arduino to generate a 12V trigger signal?

SHD + Arduino to generate a 12V trigger signal? 6 days 8 hours ago #51825

  • Bolduque
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With corona I have a bunch of spare time on my hands I was looking to see if I can solve my "issue" of not being able to trigger my monoblocks on/off. My amps are connected to my SHD via XLR, which leave RCA 1 and 2 available. Would it be possible to connect RCA1/2 to an Arduino which listens for imput and then, after recieving sends a 12V signal to my amp? (arduino being powered separately). My amps only have on/off switches on the rear so turning them on and off every time is a bit of a hassle so now they're just always on, though the power draw is very low.

This project has "ground loop" written all over it but it seems like a fun experiment.
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SHD + Arduino to generate a 12V trigger signal? 6 days 6 hours ago #51828

  • entripy
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That seems feasible. Ground loops are obviously a potential problem as you say but you could probably solve that either with an audio isolation transformer on the audio signal to the arduino and/or an opto-isolator on the digital signal to your amps. Then again perhaps a low voltage relay would be better, the contacts could switch the 12V which the arduino might not otherwise be able to generate and the coil is galvanomically isolated from the contacts. I've never used an arduino but most microcontrollers seem happier with 3.3V or 5V.

So the hardware doesn't seem to need any complicated or expensive parts, then it's just a matter of writing the firmware :)
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SHD + Arduino to generate a 12V trigger signal? 6 days 6 hours ago #51829

  • Bolduque
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I've also never worked with Arduino before but this seems like a nice and feasible project. Indeed a relay might be a better idea than from the Arduino directly. I'm going to dive into this and post updates here if I actually get around to doing this!
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SHD + Arduino to generate a 12V trigger signal? 5 days 14 hours ago #51847

  • wayneloeb
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how about this?
www.bobwireaudio.com/
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SHD + Arduino to generate a 12V trigger signal? 5 days 12 hours ago #51850

  • Bolduque
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This is exactly what I would be building! Could you trigger two separate amps with one device you think? As having to drop 200 for such a small project seems a bit extreme to me :)
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SHD + Arduino to generate a 12V trigger signal? 5 days 11 hours ago #51854

  • entripy
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It has two 12V trigger outputs but they function differently. Even a single 12V trigger out can be connected to many different destinations though, as shown in the manual, so as long as you can sort the cable splitting out it should work fine..
Last Edit: 5 days 10 hours ago by entripy. Reason: typos
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SHD + Arduino to generate a 12V trigger signal? 5 days 5 hours ago #51857

  • wayneloeb
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just use a mono Y-cable
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SHD + Arduino to generate a 12V trigger signal? 5 days 5 hours ago #51858

  • wayneloeb
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just use a mono Y-cable to split to two amps
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SHD + Arduino to generate a 12V trigger signal? 4 days 23 hours ago #51862

  • notman
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This BobWire thing is new to me but seems like a great option. One thing: it apparently only works off a toslink signal. That’s not your use case, and the SHD doesn’t have toslink out. Looks to me like you’ll have to use either a cheap RCA-to-toslink ADC if you want to use RCA out, or you could use the SHD’s spdif digital out and a cheap spdif-to-toslink converter. Either of those would be about $15 on Amazon. Obviously you just let the digital signal die inside the BobWire and use it for the 12v trigger.
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