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rhildenbrand 17th February 2004 06:48 PM

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...


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

2 Attachment(s)
Does this offer better protection than the regular thermistor?

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

John H

MEGA_amp 23rd April 2004 01:55 AM

2 Attachment(s)
And this

MEGA_amp 23rd April 2004 02:08 AM

2 Attachment(s)
found it.

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

pic from zen-v4

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