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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Granite audio ground zero posted by jhrlrd on August 29, 2016 at 00:42:00:
"How do you isolate signal ground from chassis ground, and still have them both grounded?"
There are various schemes out there. One uses back-to-back diodes. The forward voltage drop of the devices act as a barrier to ground loop currents. With my DIY power amps I use a thermistor in parallel with a 1uF film cap. The cold resistance of the thermistor acts as a barrier (resistance goes toward zero gif there is a fault and real current) and the cap AC grounds the circuit.
You should make sure the ground connection in your amp isn't compromised. I had similar issues with one of my amps. I needed to scape (sand) the chassis under the ground lug to achieve a solid connection. A circuit that is not properly grounded will certainly "buzz".
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: Granite audio ground zero - JKT 11:25:09 08/29/16 (4)
- RE: Granite audio ground zero - jhrlrd 22:15:54 08/29/16 (3)
- RE: Granite audio ground zero - JKT 16:58:21 08/30/16 (2)
- RE: Granite audio ground zero - jhrlrd 17:46:27 08/30/16 (1)
- RE: Granite audio ground zero - JKT 18:21:24 08/30/16 (0)
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