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Old 17th March 2015, 03:35 PM   #1
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Default Connect Virtual Ground to Real Ground

Dear All:

I am using a cmoy design amplifier using a voltage divider to create a "virtual ground" (8v/2) = 4v.

Is there a problem if i connect the virtual ground (4v) of the amplifier to a real ground in the analog source?

For example if I connect a jack to my computer headphone output there will be a difference of 4v between the "virtual ground 4v" vs the real ground of my computer jack connector.

I'm confused.

Regard.
Alfredo Mendiola Loyola
Lima, Peru
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Old 17th March 2015, 03:43 PM   #2
DF96 is offline DF96  England
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Every voltage is the difference in potential between two places. No one place has a voltage. So you need to ask yourself: with respect to what is the virtual ground at 4V? Another question is: what is the voltage at one terminal of a battery?
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Old 17th March 2015, 03:54 PM   #3
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Quote:
Originally Posted by DF96 View Post
Every voltage is the difference in potential between two places. No one place has a voltage. So you need to ask yourself: with respect to what is the virtual ground at 4V? Another question is: what is the voltage at one terminal of a battery?
I'm using a 8 volts power supply, but I can replace that power supply by an 8v battery.

+4v (8v with respect to 4v)
-4v (0v with respect to 4v)

Regards.
Alfredo
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Old 17th March 2015, 04:08 PM   #4
Did it Himself
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If the 8V supply is floating - like a battery would be - then you can connect the grounds.
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