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Project 3A fusing problem
Project 3A fusing problem
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Old 10th August 2002, 11:49 AM   #31
annex666 is offline annex666  England
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Originally posted by Bill Fitzpatrick
I always say, "If you're tired of your 5amp fuses blowing, wire a 4amp fuse in series with it."
Now that's more like it.

A good designer always protects the output transistors, speakers and fuses - people all too often neglect to protect their expensive fuses from blowing.
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Old 12th August 2002, 06:50 AM   #32
swede is offline swede  Switzerland
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I'm getting more and more into the idea on always using a slow start circuit and only one (pretty small) fuse, on the input (220/110 AC) post. That way, you won't have any current at all on any rail if the fuse goes. Just make sure the fuse is "small enough". Fuses are cheap. The trick is to make them not to go off when you turn the amp on.

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Old 12th August 2002, 01:15 PM   #33
mrfeedback is offline mrfeedback  Australia
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Default Fuse Types

Fuses are available in 3 ratings - fast, delay (T), and slow blow, and sand filled ceramic.
T type fuses are standard in commercial audio, video and television equipment, and will withstand turn on transients.
They are indentifiable by a small solder bead on the fuse wire, and stamped on the end cap with the designation for example - 250 V 2AT.
Another high surge rated fuse type is the ceramic bodied, sand filled fuses as used in microwave ovens.

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Old 24th August 2002, 09:49 AM   #34
annex666 is offline annex666  England
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Default Re: Velleman K4700

I'm thinking of employing the Velleman in my P3A variant amp that's currently on my workbench - would it be worthwhile sacrificing the turn-on anti-thump protection and placing the relays on the power line instead of the speaker line?

The relays claim to be be 10A which should be ok for the amp if not driven hard right?

Would this setup work? If it does surely it would protect all components (appart from the one that failed in the first place) and the speakers too?
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