Chassis Ground = Circuit Ground --> Problems?

rhildenbrand · 17th February 2004, 06:48 PM

I'm working on a DIY pre-amp project (for home theater use). The RCA jacks I'm using will be grounded to the chassis due to their mounting design. I'm not planning to ground the chassis to mains ground; however, the chassis will be grounded to both the circuit ground and the ground from the RCA jacks.

I'm assuming that this will NOT result in a problem; but it can't hurt to ask...

Thanks,
Robert

eLarson · 17th February 2004, 08:44 PM

The usual cautions about how your first shock can be your last apply here. I'd be inclined to ground the chassis to the earth prong of the outlet and float the RCAs with plastic shoulder washers.

My $0.02.

Nelson Pass · 17th February 2004, 08:53 PM

Another approach is to attach the chassis to earth ground
through a nice 35 amp rectifier bridge. The two AC pins
connect together on one side, and the + and - pins connect
together on the other. This isolates the chassis and circuit
ground from the AC earth up to about .6 volts, enough for
prevention of ground loops and protection from shock.

MEGA_amp · 23rd April 2004, 01:51 AM

Does this offer better protection than the regular thermistor?

Also, is this scheme better for circuit ground as well?

regards,
John H

MEGA_amp · 23rd April 2004, 01:55 AM

And this

MEGA_amp · 23rd April 2004, 02:08 AM

found it.

For monoblock, you would connect the AC pins together, correct?

pic from zen-v4

17th February 2004, 06:48 PM	#1
rhildenbrand diyAudio Member Join Date: Feb 2004 Location: California	Chassis Ground = Circuit Ground --> Problems? I'm working on a DIY pre-amp project (for home theater use). The RCA jacks I'm using will be grounded to the chassis due to their mounting design. I'm not planning to ground the chassis to mains ground; however, the chassis will be grounded to both the circuit ground and the ground from the RCA jacks. I'm assuming that this will NOT result in a problem; but it can't hurt to ask... Thanks, Robert

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17th February 2004, 08:44 PM	#2
eLarson diyAudio Member Join Date: Aug 2002 Location: Gaithersburg, MD	The usual cautions about how your first shock can be your last apply here. I'd be inclined to ground the chassis to the earth prong of the outlet and float the RCAs with plastic shoulder washers. My $0.02.

17th February 2004, 08:53 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Another approach is to attach the chassis to earth ground through a nice 35 amp rectifier bridge. The two AC pins connect together on one side, and the + and - pins connect together on the other. This isolates the chassis and circuit ground from the AC earth up to about .6 volts, enough for prevention of ground loops and protection from shock.