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Old 13th August 2010, 04:11 PM   #1
lga775 is offline lga775  Malaysia
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Default DAC humm: suspect grounding issue

Would like to ask is there any grounding issue in my circuit? Currently running 6n6p SRPP.

Your help is highly appreciated.
Thank you for your time and consideration.


Earth Ground
1. Connected to chassis
2. Transformer screening analog
and digital
3. AC Tube heater

Chassis ground
1. Power supply caps
2. Signal ground

Signal ground
1. Digital ground to rca ground
2. Rca ground
3. Tube pin9 ground
4. Resistor cathode ground

Digital ground not earthed.


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Old 15th August 2010, 04:24 PM   #2
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If you have signal ground connected to chassis and earth you have a perfect ground loop opportunity. Isolate the electronics from the chassis with a thermistor or diode bridge or something.
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Old 15th August 2010, 04:27 PM   #3
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Old 15th August 2010, 05:07 PM   #4
lga775 is offline lga775  Malaysia
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Quote:
Originally Posted by Bill Fuss View Post
If you have signal ground connected to chassis and earth you have a perfect ground loop opportunity. Isolate the electronics from the chassis with a thermistor or diode bridge or something.
I did remove the earth from signal ground still the same.
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Old 15th August 2010, 06:48 PM   #5
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Without a diagram it's very hard to help. You have many ground loops, according to your notes.
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