Why V- = 0 in Paint Doc Op-Amp Question

Thread starter Miike012
Start date Nov 13, 2013
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Op-amp

In summary, the V- input of a paint doc op-amp is typically connected to ground to provide a stable reference voltage and ensure accurate amplification of the input signal. It can also be connected to a different voltage to create a specific offset or bias in the output signal, but this is not common. The V- input does not directly affect the amplification of the op-amp, but it plays a crucial role in stabilizing the output signal. It is necessary to connect the V- input in a paint doc op-amp in order for it to function properly and produce accurate and stable output signals.

Nov 13, 2013

Miike012

Problem in paint doc.
I'm interested in why V_- = 0.

Is it always true that V_- = 0?
If not how was it decided that V_- = 0 for this given probem?

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Nov 13, 2013

Miike012

Nevermind I figured it out. V₊ = 0
and V₊ = V_-

Nov 14, 2013

rude man

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You still asked a good question. Is V- always zero?
Answer: no, but it's always = V+ unless the op amp output is saturated.

1. Why does V- equal 0 in a paint doc op-amp?

The V- input of an op-amp is typically connected to ground, which means it is held at a constant voltage of 0 volts. This helps to stabilize the output of the op-amp and ensure accurate amplification of the input signal.

2. What is the purpose of the V- input in a paint doc op-amp?

The V- input is used to provide a reference voltage for the op-amp. By connecting it to ground, the op-amp can accurately measure the input signal against this fixed reference point.

3. Can V- be a different voltage in a paint doc op-amp?

In some cases, the V- input may be connected to a different voltage instead of ground. This is often done to create a specific offset or bias in the output signal, but it is not a common practice in paint doc op-amps.

4. How does the V- input affect the amplification of a paint doc op-amp?

The V- input does not directly affect the amplification of the op-amp. However, by providing a stable reference voltage, it helps to ensure that the output signal is accurately amplified and not affected by any fluctuations in the input signal.

5. Is it necessary to connect the V- input in a paint doc op-amp?

Yes, it is necessary to connect the V- input in a paint doc op-amp. Without this reference voltage, the op-amp would not function properly and may produce inaccurate or unstable output signals.