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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: grounding questions.... posted by vinnie2 on April 28, 2015 at 05:23:34:
Only two ground connections on the power supply - AC cord safety ground and a connection to your signal chassis. Everything else floats - though I'd connect B- to chassis through a 100 Ohm resistor. Same on the OPT chassis - secondary to (-) speaker terminal, then to chassis, no others except for connection to signal chassis. If you will use negative feedback, run a pair back to the signal chassis from speaker terminals rather than grounding it there.
I would NOT recommend two mains cords on one chassis - it is not allowed by product safety standards. If you really need separate inputs for B+ and heater, put them on separate chassis. Or build in a small variac.
The signal chassis should be quiet if you don't run power supply current through it. Heaters must be at AC ground (single point!). A ground bus should be fine, but it will be long to allow close connections to each socket. Keep ALL current loops out of it! All supply filtering should be in the PS chassis, though you'll want a bypass on the signal chassis,
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Follow Ups
- RE: grounding questions.... - Tom Bavis 04/28/1511:46:07 04/28/15 (1)
- RE: grounding questions.... - vinnie2 12:19:45 04/28/15 (0)
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