modified 9 years ago

signalgain - Two virtual grounds

00:34:52

signal amplifier tuned for positive voltages using a virtual ground on each inverting amplifier
By using a virtual ground the negative going input signal on the first stage amplifier is offset into the positive range. the first stage is an inverting amplifier. the second stage is also inverting so it needs a virtual ground also.

published 9 years ago

j3m

9 years ago

Why do this

smorgana

9 years ago

you would use two inverting amplifiers so the gain math is the same for both amplifiers, each amp is set for the square root of the total gain required. it allows you to use the same resistor values on both amps. if you combine an inverting with a non inverting youd need different resistor value for the feedback resistor to get the same gain. its better to stock less unique parts.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.