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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.

Thermocouple Amplifier

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.

Differential Amplifier -
            Op-Amp Circuits

Vout = (Vp - Vn) * (Rf/Ri)

Interactive Tutorials using Virtual Electronic Components

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 mouse pointer over the two buttons, no clicking. This reduces finger strain and also you have a long lasting mouse. 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.

Guard rings in strain gauge measurement

Finally you have a DVM a Digital Volt Meter that just Displays the Voltage at any Point, this readout value has to be noted down.

Use the "iframe" part in this Differential Op-Amp xml code

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

Voltmeter Attenuator

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 Opamp Simulations

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20th Mar 2020


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