Simplistic Mosfet HV Shunt Regs - Page 261 - diyAudio
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Old 24th January 2012, 12:44 PM   #2601
Salas is offline Salas  Greece
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Still if something leaks to chassis and to safety earth, a breaker should trip, yes?
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Old 24th January 2012, 01:21 PM   #2602
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I plan to have trafo in another box with rectifiers only and will carry earth ground, signal ground and postive rail to main case, where the case will grounded through earth wire. What about ground loop breaker for signal ground. I use CL60 in Pass amps. What is traditionally done in tube amps? THanks for the advice and looking out.
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Old 24th January 2012, 01:41 PM   #2603
Salas is offline Salas  Greece
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I don't lift them before something's buzzing. If lifting, always with yin yang diodes or whatever guarantees they will see earth on any bad incident.
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Old 24th January 2012, 03:26 PM   #2604
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Quote:
Originally Posted by Salas View Post
Still if something leaks to chassis and to safety earth, a breaker should trip, yes?
no.

earth leakage detection (elcb, rccb, etc) work by comparing the Live current to the Neutral current. If they don't balance within the detection/trigger limit, the breaker opens.

You have a perfectly good primary circuit that does not leak to earth and kill your self with the secondary circuit (they are isolated from each other) and the earth leakage will not change.
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Last edited by AndrewT; 24th January 2012 at 03:30 PM.
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Old 24th January 2012, 03:27 PM   #2605
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Lets fuse the secondary too then.
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Old 24th January 2012, 03:31 PM   #2606
AndrewT is offline AndrewT  Scotland
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Too late, the charged capacitor will kill you.
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Old 24th January 2012, 03:35 PM   #2607
Salas is offline Salas  Greece
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I will wear plastic gloves and will shoot the bugger with a gun first if he dares an attack.
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Old 24th January 2012, 03:38 PM   #2608
AndrewT is offline AndrewT  Scotland
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This is an excellent precaution while you are building & testing. I have some 600V gloves that came with my first kit valve amplifier.

But, when built and operational, I do not advise that any part of the HV be brought to the outside of the chassis. That is asking for an accident to happen.
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Old 24th January 2012, 03:40 PM   #2609
Salas is offline Salas  Greece
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Sure, beyond any humorous note, all HV carrying parts should be well out of reach, well isolated, and wearing protection or keeping one hand to back pocket when tampering or testing are very good precautions.

P.S. Also bleeder resistor across main filter capacitor, discharges it when off, soon and low enough. I always use one.
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Old 24th January 2012, 04:29 PM   #2610
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Andrew,
How would you suggest grounding a setup where you have a seperated case with transformers and rectifiers atached to the main case by umbilical chord. As I said, with the my modular BA stuff, I have earth ground going into main case as well as PSU case. A thermistor stands between this earth connection and signal ground. If connecting signal ground to earth ground, want ground loop noise be a problem? I am trying to be as safe as possible without creating other problems.
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