How do I calculate the resistors and the capacitor on this circuit, which has ground and virtual ground as you can see?
In the second image, how do I find the current I2?
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Sign up to join this communityHow do I calculate the resistors and the capacitor on this circuit, which has ground and virtual ground as you can see?
In the second image, how do I find the current I2?
That is not a great method to use if you have more than one or two low current circuits attached to it.
The issue is any current passing back through that virtual ground has to make it through those resistors and changes the reference point. As such the resistors need to be small, which wastes a lot of current. The capacitors need to be fairly large regardless.
You would be better to use a more active circuit. Note the doubled up capacitors. This ensures a faster on time since they automatically charge up to half rail.
simulate this circuit – Schematic created using CircuitLab
As mentioned in the comments, op-amps are only good for a limited amount of current. If you need more than that there are specialized devices for this or you should be considering a proper dual-supply.