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Old 15th September 2013, 06:05 PM   #11
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Aucosticraft View Post
can we think of some relay circuit that will disconnect power rails when high current flows. and switch on back after certain time?
What if the high current were a short. The relay would then try and re-connect the rails into that short. Also the relay control circuit would need to be fed from a reliable independent supply.
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Old 15th September 2013, 06:14 PM   #12
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I agree....... but then we have slow blow fuse too. and if the slow blow fuse too blows off then, we can feel sure that it is dead short. ( the slow blow fuse will blow off after couple of relay resets.)

Add: OR we can say, depending on the current flow , relay should determine, if it should reset.
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Old 15th September 2013, 06:18 PM   #13
Mooly is offline Mooly  United Kingdom
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Complicated... you would have to sample the current and have some means of determining if the relay should operate again based on the current that actually blew the fuse.
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Old 15th September 2013, 09:47 PM   #14
DUG is offline DUG  Canada
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If you have a fast acting circuit disconnect then how are you going to set off a slow blow fuse?

Have you ever had a computer power supply that just kept chirping every second or two?

That is an automatic retry on an over current or short circuit situation.

With analog circuitry you can do as I suggested in post #5 and with added digital decision making (4 tries and stop) you can stop it from starting again until an operator reset occurs.

Nothing new here.

But do you need it in your amp?

If you really do then go for it...I will help where I can.

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