short circuit protection

[oldjack]

Hi Spook,
I have also looked at a sensing resistor in the supply rails.
I built a triamp system which works great but I am now looking at short circuit protection.
With my current system I have a transformer/rectifier for the LF amp and a single transformer with rectifier followed by linear voltage regulators for each of the MF and HF amps. I am considering using two LM317 regulators in series, the first with current limiting sense resistor and the second as a voltage regulator.
This would be required for each of the + and - supply rails. For my case with three stereo amps this means four pairs of regulators per amp (total of 12 pairs for the triamp).
LM337 would be used for the - rails.
These regulators are cheap to use and would cope with the current loading as it is a triamp (LF amps are 60w per channel) and one pair of regulators only supplies either the + or - rail for one amp.
Any comments as I have not built it yet.

 

[spookydd]

I am considering using two LM317 regulators in series, the first with current limiting sense resistor and the second as a voltage regulator.
This would be required for each of the + and - supply rails. For my case with three stereo amps this means four pairs of regulators per amp (total of 12 pairs for the triamp).
LM337 would be used for the - rails.
These regulators are cheap to use and would cope with the current loading as it is a triamp (LF amps are 60w per channel) and one pair of regulators only supplies either the + or - rail for one amp.
Any comments as I have not built it yet.

Have you built any of this yet?

How do you think those LM317/37 can handle power amps? Seems they're too weak for this.

But how about that rail current sensing scheme? How is that coming?