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Old 18th February 2006, 10:00 PM   #1
roger-k is offline roger-k  Norway
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Default Inrush current limiter?

My amp have a 500VA transformer and I want to make a current limiter, because the fuse in my living room is sometimes broken when I switch the amp ON.

What will be the best of these two:
http://sound.westhost.com/project39.htm
or just a CL-60 in series with the transformer?

I have read many thread but I'am little confused, so I will be very happy for any suggestions.
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Old 18th February 2006, 10:35 PM   #2
lgreen is offline lgreen  United States
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Default it depends

Depends on what you want. A CL-60 in-line with a primary lead will work fine, just don't do an off-on rapid sequence or you won't have any inrush protection.

Also if your amp is AB rather than class A you might find the CL-60 does not drop all the way down to its minimum resistance due to low average current draw.

The project 39 is good too, I implemented that with a CL-60 instead of a resistor. More complicated but pretty good protection.
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Old 18th February 2006, 10:47 PM   #3
AndrewT is online now AndrewT  Scotland
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Hi,
if your power supply has a habit of dropping out for more than a few cycles then I would use a relay shorting resistor or resistor+cl60.

In any case use a relay to short out the thermistor and properly connect the amp to the supply.
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Old 18th February 2006, 10:53 PM   #4
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The advantage of having a relay and a resistor is much shorter reset time.

From what I know there are at least 5 different solutions out there ready made and bare pcb's.
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Old 19th February 2006, 07:42 PM   #5
roger-k is offline roger-k  Norway
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OK, I will make project 39 and implemente a CL-60 instead of a resistor.
Thanks for the replys.
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