modified 10 years ago

Question about virtual ground

01:01:36

Here I made the typical configuration to make a virtual ground. Now once I connect a resistor to the virtual ground, the voltage changes because the resistors add in parallel.

Now, I made another configuration myself, in which case I can connect the resistor without changing the voltage across.

My question is, Why is the first configuration most commonly used? Am I making something wrong??

published 10 years ago

rich11292000

10 years ago

Build it and measure. I cant join you, work threw me i the fire pit.

hurz

10 years ago

The second config doesn't make sense, it stabilize voltage which is already stable. In the first config the sensitive center point is taken as reference and made stable (+-20mA) as virtual ground! Hope this helps. If not - start with a simple voltage divider and load it for different scenarios symmetric and more important unsymmetrical and see were the voltage drops and increases!

hurz

10 years ago

Check this http://everycircuit.com/circuit/4890494916624384

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