XPA Gen 1, 12 volt trigger

[loupy]

Hi Everyone

I have 2 XPA amps, 3 channel and a 5 channel, Gen 1, I have had them for several years now, and they are Fantastic, sound great , no problems.
my pre amp, UMC-1,  has died, , so I am looking around for a new pre-amp or avr with pre outs, 

My question is, What is the  Milliamp Draw for the 12 volt trigger 0n these 2 power amps.

I would very much appreciate this info.

Regards
Peter

[SteveH]

Buy yourself an ET-3 trigger/repeater and it will probably trigger whatever you have, it has three outputs for a 150ma total output. I used one to make a triggered power strip for some of my audio components. The measured voltage output was 10.8VDC.

emotiva.com/collections/accessories/products/et-3

[emotimmo]

I know their newer stuff is 5-12V <10 mA input current required and I think that has always been their design. Best to email their support to get an answer. I couldn't find the spec for Gen 1 in writing, but I see the UMC1 has trigger outputs of 150ma. Also, don't either of the amps have their own trigger output power supply to offload some of the demand if you were to daisy chain? Either way, I do not believe these amps used heavy relays that required much to trigger and support is your best source.

[speedydave]

The 12 volt trigger input, at least on the XPS-2 gen 1 utilises a 4n35 opto-coupler to switch 5v to the micro ( which then does the main power on relay dance to fully power up the amp )

The 12v trigger positive is fed via the "tip" connection of the trigger plug, thru a 510 ohm resistor , thru the opto-coupler LED and then back out on the "ring" terminal of the trigger plug.

Spec on the 4n35 say 50mA MAX current thru the input LED

12v (minus 1.3v fv ) thru the 510 ohm resistor gives a forward current of about 20mA which is well within the max spec of the opto.

At 20mA trigger current per amp, you could string 5 of them together and still only be drawing 100mA from the "Master" device.
Really not an issue !