Velleman K4700 with +-60V ? - diyAudio
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Old 7th January 2010, 01:24 PM   #1
Session is offline Session  Norway
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Default Velleman K4700 with +-60V ?

I have a UCD 400 amp with 800VA torroid +-60V DC. Will Velleman kit K4700 be able to handle this?
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Old 7th January 2010, 02:29 PM   #2
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I don't fully understand your question because the K4700 is for speaker protection only, and is not contolling the trafo you mentioned. The K4700 is connected to the mains and has its own PSU/trafo. The speakers are connected to the relays and the ground wire is also connected to the PCB.
Do you think the K4700 is a soft start module? because it is not.
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Old 7th January 2010, 02:34 PM   #3
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here's a link to the manual (scroll down)-
2-Channel Loudspeaker Protection Kit (K4700)
please read
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Old 7th January 2010, 03:28 PM   #4
Session is offline Session  Norway
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I am sorry. I was only mentioning that to be sure it can handle the power to the speakers. So you say it is fine?
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Old 7th January 2010, 03:42 PM   #5
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The relays can handle up to 10amps. I think that should be plenty.
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Old 7th January 2010, 03:47 PM   #6
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I see... Thank you. I will order one and test it out
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Old 7th January 2010, 04:38 PM   #7
adason is offline adason  United States
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I am using this velleman speaker protection circuit, it works great, its well designed, I like it
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Old 7th January 2010, 06:05 PM   #8
Session is offline Session  Norway
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Perfect! No use in blowing up the speakers when this is so cheap
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Old 7th January 2010, 06:13 PM   #9
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Quote:
Originally Posted by DubbLinn View Post
The relays can handle up to 10amps. I think that should be plenty.
They can pass 10A, but they will struggle with 60V DC at several amps to break though - check out their VA breaking capacity. The only alternative is huge relays but that probably requires a new board, beyond your scope I suspect. So try them, got to be better than nothing.
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Old 7th January 2010, 08:14 PM   #10
adason is offline adason  United States
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that speaker protection circuit will never see +/-60 volts, it cuts speakers off at 1 vold DC on the ouput...so no worries...

I do not understand why would anyone even brought up the power supply voltage of the amplifier into the equation...that completely does not matter!

you can connect the DC protection curcuitry even on 400 volt amp, it senses anything above 1 volts and turns off....no more current!

Last edited by adason; 7th January 2010 at 08:17 PM.
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