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Old 19th November 2004, 10:15 AM   #1
k1jroth is offline k1jroth  Finland
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Default Load Current limiting

I`m building 2 channel amplifier to my subwoofer and
have a problem with current when amplifier is off and i turn it on.

I think load current is too much for my fuses.
Transformer is toroidal 230V 2x40 1200VA
and there is 144000uF capasitance.
input fuse is 10A slow and output fuses are 10A fast.

How can i limit loadcurrent that fuses won`t burn?

Please help!
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Old 19th November 2004, 10:27 AM   #2
quasi is offline quasi  Australia
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Provided there are no problems with your setup it could be the in-rush that is blowing the fuses.

Try a soft start cct. Theres has been plenty of stuff here about that. Do a search for "soft start" or "soft turn on"

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Old 20th November 2004, 06:20 AM   #3
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Your description is kinda vauge. Are the output fuses for the output transistors that are burning too? If this is the case, your circuit may not be balancing when initially powered up, or not biasing properly as the voltage builds. You might take a measurement of the initial current in outputs. As for the input, 1200 VA would have a lot of surge current and as Quasi pointed out, a soft start circuit would work there.
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