﻿ Hardware Modules > aMG SIGCON-A > Signal Conditioning Design Guidline > Sample Applications > Zero-Span > Vin 0-3V, Vout -12 to +12 V

# Vin 0-3 V, Vout -12 to +12 V   The set of data points, Vout = -12 V @ Vin = 0 V, Vout = +12 V @ Vin = +3 V, see the transfer curve below.

### Transfer Curve -12  = m(0) + b

12  = m(3) + b

After algebraic manipulation, yield the solution, m = 8 and b = -12, rewrite m and b to new equation.

Vout = 8Vin - 12

The equation above similar to  the CASE2: Vout = +mVin - b circuit. We can calculate the value of R1, R2, RF and RG by the following equations: The circuit configuration which yields a solution is shown below.

### Circuit Diagram Configuration of aMG SIGCON-A: Soldering to Jump J5, J7, X2 and X3. Place 5 kΩ resistor to X6, 20 kΩ to X7, 150 kΩ to X8 and 820 Ω to X9 . ## Summary

The recommended design procedure for zero-span op-amp design is:

 1 Substitute the data set into linear equations to obtain m and b (the slope and intercept of a straight line).
 2 Determine the form of the circuit by m and b then choose the circuit configuration that fits the form.
 3 Using the circuit equations which selected, calculate the resistor values.
 4 Build the circuit using aMG SIGCON-A.
 5 Test the circuit, take data and verification.