Triggering pro audio sub amp on/off for HT - diyAudio
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Old 30th October 2012, 08:58 PM   #1
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Default Triggering pro audio sub amp on/off for HT

How would you trigger a pro amp on/off with your receiver that doesn't have a 12v trigger? I thought the receiver had one, and was going to use a 12v solid state relay, but turns out it doesn't.

I want my sub amp to come on off with just remotely turning on the receiver.

I have:
Marantz sr5006
Qsc mx1500 quiet fan mod for HT use
Mini DSP

The mini DSP is powered off the USB of the receiver, so that comes on / off with the receiver.

I pulled the power switch from the QSC and ran wires to the back for the switch, so I can mount a relay in the future if that will work. It's 120VAC switch

I'm thinking a 5V solid state relay which grabs power from the mini DSP, which would be powered up when the receiver turns on. I'm just not sure if there is enough power from the USB to operate a relay, and if I can find a relay that will have a high enough amperage rating for the QSC amp. (As far as I can tell, the power comes in through the main power switch first on the QSC, so it needs to be able to handle 15amps or so)
Any suggestions for good solid state relays?

I Also don't know if the external power connection and the mini USB in on the mini DSP are connected in parallel without a diode?


Any other CHEAP solutions for simply getting the amp to power on when I turn the receiver on?
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Old 30th October 2012, 09:05 PM   #2
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I guess I could use this, but for future setup I'd like my sub amps on a separate circuit (outlet) from the receiver...
ZuniDigital ZG10222B-27 10 Outlet Digital Smart Green Surge Protector (Black):Amazon:Electronics
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Old 30th October 2012, 09:48 PM   #3
tb46 is offline tb46  United States
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Location: Texas
Hi,

A simple somewhat brute force method is a simple contactor (120VAC coil voltage):

Mars GE 18002 Magnetic Line Contactor 3ARR8 2 Pole 30A | eBay

http://www.ebay.com/itm/DEFINITE-PUR...item2ec238edfd

Regards,
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Oliver

Last edited by tb46; 30th October 2012 at 09:51 PM.
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Old 30th October 2012, 11:20 PM   #4
Djim is offline Djim  Netherlands
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Location: 'Ollanda
Hi mRgSr,

You can use the USB output from the receiver to power a LED that is attached to a light sensitive relay-switch.
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Old 31st October 2012, 12:11 AM   #5
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Link to any that can handle 120VAC 10-20a?
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Old 31st October 2012, 12:12 AM   #6
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Tb that's a 120vac coil?
I've used contactors before in heavy duty applications three phase machine powering etc but never saw as low as a 5v coil on them...

Last edited by m R g S r; 31st October 2012 at 12:36 AM.
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Old 31st October 2012, 12:36 AM   #7
Djim is offline Djim  Netherlands
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If you have a 12V system link connection on your receiver you can use:
Simple Relay Board
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Old 31st October 2012, 01:35 AM   #8
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That would have made all this easier. There's no 12v trigger of any kind on it.
I originally thought there was and was about to order the relay i had picked out (12v, zero cross, 120V 20amp) but I decided to double check And there is no trigger. Grrr
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Old 31st October 2012, 01:43 AM   #9
Djim is offline Djim  Netherlands
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Lol, yeah I know how it works. For the last 25 years they always has such trigger.... and now after 25 years you need it for the first time and now there ain't...
I guess you are still under the warranty period, I guess, so getting internal 12V is not really an options either. Well, the photo/light sensitive switch + USB-led is still an option.
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Old 31st October 2012, 01:46 AM   #10
Djim is offline Djim  Netherlands
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Light/Dark Relay Switch Kit with TR
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