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roger-k 18th February 2006 11:00 PM

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:
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.

lgreen 18th February 2006 11:35 PM

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.

AndrewT 18th February 2006 11:47 PM

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.

peranders 18th February 2006 11:53 PM

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.

roger-k 19th February 2006 08:42 PM

OK, I will make project 39 and implemente a CL-60 instead of a resistor.
Thanks for the replys.

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