Differential Amplifier - Op-Amp Circuits
This amplifies the difference between two inputs Vp and Vn the low impedance of this configuration is a drawback, but can be used in analog computing. Optimum VCC VDD can be +12/-12. AC signals common to Vp and Vn are canceled by this configuration.
Differential Amplifier - OpAmp Circuits
Use a capacitor like 10nF plastic from pin 2 to 3 or across R2 to make circuit stable. For AC applications use LF351 TLO71 as they have good slew rate and also are FET inputs. For AC applications use a capacitor (1uF) in series with Ri to block DC Components. The Inputs have asymmetrical input impedance this affects CMRR, also use 1% tolerance MFR resistors for Rf and Ri.
This has Virtual Meters and Pots, shows how a Operational Amplifier works. Slide the Potentiometers and vary the mV Source, See Output DVM. Slide the Potentiometers just like you would operate a Sliding Control. Drag the Knob on Pot to increase or decrease the resistance. The Resistance is shown is blue letters and dynamically alters value as you slide the pot. The mV Source is varied by just moving or hovering mouse pointer over the two buttons, no clicking. The mV buttons are special, the variation picks up speed if you let the mouse pointer remain on the button. This is Ramp-up and Ramp-down. This enables you to set it faster with just two buttons.
Differential Amplifier is used in Analog Computation for the Minus Operation or Subtraction. It also has a better noise rejection and CMRR, but this one amp differential circuit has low impedance as the resistors network load the signal source. It is good only for an intermediate stage.
Vout = (Vp - Vn) * (Rf/Ri)
One of the biggest advantages in analog computing is stability in noisy conditions, it does not reset. It is also as "Real Time" as real time can be. But more circuitry is required for complex operations. The advancement of Semiconductor Chip Processing Technology makes it possible to develop an Analog Equivalent of FPGA. This may bring back Life into the Analog Designer Lab.
More at Analog Op-Amp Circuits