are both these bridge recitfier ground loop breakers the same? - diyAudio
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Old 21st April 2017, 11:22 AM   #1
ctrlx is offline ctrlx  United Kingdom
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Default are both these bridge recitfier ground loop breakers the same?

are both these bridge recitfier ground loop breakers the same?
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Old 21st April 2017, 11:46 AM   #2
Ketje is offline Ketje  Belgium
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The first one allows 1.2V max beween house and chassis, the second one only 0.6V.
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Old 21st April 2017, 04:16 PM   #3
AndrewT is offline AndrewT  Scotland
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The left drawing is wrong.
It shows the Diode Bridge between the House Ground and the Chassis Ground.
One MUST NEVER put anything into the Protective Earth link from Chassis to the PE wire.

The PE wire MUST be directly connected to the Chassis. There are no exceptions.

The Disconnecting Network (DN) if required goes into the link from Audio Ground to the Chassis.
This is usually not required in a mono block amplifier.
It is sometimes unnecessary in the two channel amplifier, but most multi-channel amplifiers seem to require the DN to attenuate interference current crippling the Hum performance after connecting source equipment.
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Old 21st April 2017, 04:21 PM   #4
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+ left is series, right is parallel wiring of the diodes, so twice the current handling. Left is so wrong it's scary
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Old 21st April 2017, 07:42 PM   #5
Ketje is offline Ketje  Belgium
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Looks like this.
I like he left one
Mona
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Old 21st April 2017, 07:45 PM   #6
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Ha ha, whatever the drawer has done there trying to help has had the opposite effect on my brain! I'm worried in the left one what happens in the middle?
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Old 21st April 2017, 07:47 PM   #7
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by scottjoplin View Post
Ha ha, whatever the drawer has done there trying to help has had the opposite effect on my brain!
Even more confused ?
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Old 21st April 2017, 07:55 PM   #8
Gusser is offline Gusser  United States
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Just note that these ground lifters are not found in any commercial gear. Certainly not in any gear with a UL or other authorized safety certification.

If the device is engineered properly, this is totally unnecessary. It's a hobbyist hack and a dangerous one at that as it is often done improperly.
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Old 21st April 2017, 08:05 PM   #9
Ketje is offline Ketje  Belgium
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Originally Posted by Gusser View Post
Just note that these ground lifters are not found in any commercial gear. Certainly not in any gear with a UL or other authorized safety certification.

If the device is engineered properly, this is totally unnecessary. It's a hobbyist hack and a dangerous one at that as it is often done improperly.
You could be right.Better do it like this, but with diodes up to the task i think there is no problem.
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Old 21st April 2017, 08:11 PM   #10
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It can be done safely I believe, as many do
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