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Do I need a relay?

1814 Views 41 Replies 8 Participants Last post by  BobTheBirdTurd, 
T
Hello,

We are using Helix .2 DSP and running a remote turn on out from DSP without any relay. We are about to add other 3 amps to my friend system. Do I need to add a relay to the remote turn on?

Thank you,
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DaveG
You should be fine without it. Relay probably draws more amps than the 3 amp remote turn ons.
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L
3 new amps plus existing one(s)? Idk what the limit is on the DSP remote out but you might want to review that carefully. If you draw more current that it’s capable then that remote output will permanently fail.
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DaveG
I interpreted 3 total but maybe I misinterpreted? 3 total will be fine.
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daloudin
My Helix Mini turns on 7 amps with no problem.
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DaveG
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DaveG
And the right way
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L
If you want to use a relay here is what I used for my minidsp

Digikey Link
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BobTheBirdTurd
Depends on the DSP. Helix has like 500mA capacity which is a lot. Mosconi DSP on has 100mA. Amp draw is different for every Amp but is usually 50-75mA based on my research. Relay must have a diode to prevent voltage spike on power off.
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ItsonlyaHONDA
My M4DSP turns on 3 other amps with no issues. You should be good.
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LinkyPwns said:
3 new amps plus existing one(s)? Idk what the limit is on the DSP remote out but you might want to review that carefully. If you draw more current that it’s capable then that remote output will permanently fail.
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Total is 4 amps. One Zapco 650.6(will upgrade soon), three Mosconi 2/10. How can I find out the limit on the DSP remote? Thank you,
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DaveG said:
I interpreted 3 total but maybe I misinterpreted? 3 total will be fine.
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4 total.
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BobTheBirdTurd said:
Depends on the DSP. Helix has like 500mA capacity which is a lot. Mosconi DSP on has 100mA. Amp draw is different for every Amp but is usually 50-75mA based on my research. Relay must have a diode to prevent voltage spike on power off.
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Thank you. All Helix DSP have 500mA? My friend got the old Helix .2, where can I find those capacity?
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BobTheBirdTurd
Its in the
TonyUsa said:
Total is 4 amps. One Zapco 650.6(will upgrade soon), three Mosconi 2/10. How can I find out the limit on the DSP remote? Thank you,
[/Q
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I found it in the spec sheets of the DSPs I was looking at Finding current draw of the Amp is more difficult as most I looked at don't publish the number, so used a best guess.
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BobTheBirdTurd
TonyUsa said:
Thank you. All Helix DSP have 500mA? My friend got the old Helix .2, where can I find those capacity?
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I was looking at the Helix Pro and Ultra, they both had 500mA from what I recall. This screenshot is for an Ultra. Look at Max Remot Output Current.
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BobTheBirdTurd said:
I was looking at the Helix Pro and Ultra, they both had 500mA from what I recall. This screenshot is for an Ultra. Look at Max Remot Output Current. View attachment 347352
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Thank you, Sir. Just look at Max remote output on DSP .2 and it is 500mA.
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DaveG said:
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this is a good point. You could measure your remote current draw of all your amps to see if you are below the threshold.
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LinkyPwns said:
this is a good point. You could measure your remote current draw of all your amps to see if you are below the threshold.
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Thank you, Sir. Will do that this weekend. Hope all not more than 500mA.
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DaveG said:
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Thank you, Sir.
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BobTheBirdTurd
With 500mA, I wouldn't worry about a relay. With a Mosconi and it's 100mA I would unless I was only running 1 amp. Just thought I would take a look at another popular DSP, the MiniDSP C-DSP 8 x 12 and its only 100mV also.
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