DAC humm: suspect grounding issue

lga775 · 13th August 2010, 04:11 PM

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.

Bill Fuss · 15th August 2010, 04:24 PM

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.

Bill Fuss · 15th August 2010, 04:27 PM

There is no image.

lga775 · 15th August 2010, 05:07 PM

Quote:

Originally Posted by Bill Fuss

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.

Bill Fuss · 15th August 2010, 06:48 PM

Without a diagram it's very hard to help. You have many ground loops, according to your notes.

13th August 2010, 04:11 PM	#1
lga775 diyAudio Member Join Date: Dec 2008	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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15th August 2010, 04:24 PM	#2
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	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.

15th August 2010, 04:27 PM	#3
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	There is no image.

15th August 2010, 06:48 PM	#5
Bill Fuss RIP Join Date: Oct 2005 Location: Central Florida	Without a diagram it's very hard to help. You have many ground loops, according to your notes.

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