# Virtual Earth - Signal Connection

Im creating a guitar effects pedal as a final year university project and I'm running it all from a single supply

I understand the concept of a virtual ground such that the input signal is biased in-between the power rails however Im having a hard time understanding the correct way to connect the input signal to the op amp

Im using OPA2350 op amps with TLE2426CLP rail splitter.

The jack lead connection from the guitar provides a mono signal with the ring being 'ground' and tip being the audio signal

• Should I connect the ground of the jack lead to 'real' ground (supply rail) of the op amp then connect the audio signal to both virtual ground and the input of the op amp through a capacitor (biasing at $\frac{V_{in}}2$)
• Or should I connect the ground from the jack lead to the virtual ground from the rail splitter then connect the audio signal straight to the op amp such that the 'ground' from the guitar would be raised to $\frac{V_{in}}2$?

Which way would be correct?