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Ground check
Ground check
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Old 7th August 2019, 05:37 PM   #1
potstip is offline potstip  Turkey
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Join Date: Oct 2013
Default Ground check

Have proper ground is very important especially for class a power supply CRC / CLC design. So is there anybody know a circuit to test if ac ground is ok or not. If not ok do not let start up and gives an error with led or any if it is ok power mains troidal transformer.

Last edited by potstip; 7th August 2019 at 05:40 PM.
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Old 7th August 2019, 06:17 PM   #2
craigtone is offline craigtone  United States
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Location: Holland, MI
The only purpose for AC ground is safety. Whether it connects to the signal ground is completely up to the designer if they choose to do single-point ground with it connected or put in a ground lift circuit.

If you do still care to do this, you could purchase a cheap AC outlet checker that checks for open ground and use the open ground LED output as a way to disable a time delay power-on relay.

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Old 8th August 2019, 10:54 AM   #3
DF96 is offline DF96  England
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Yes, it seems that two quite different concepts are being confused.

The incoming AC ground is all about safety.

The proper grounding of a PSU and the audio circuits it supplies are all about reducing hum and noise.

It is unfortunate that the same word is used for these two quite different issues, but it is probably too late to invent new words to help distinguish the difference.
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Old 8th August 2019, 01:46 PM   #4
Max Headroom is offline Max Headroom  Australia
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Location: West Australia, near to the beach, natural ambient sounds mostly.
AC Socket Checker
AC Socket Tester.png
This schematic will indicate that AC wall sockets wiring is correct and could be built inside the amplifier.
Amplifier internal supplies local ground should be connected to cabinet/PE connection.

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