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GCSE     >Op Amp<     Amplifier System     Comparator     Gain     Gain Bandwidth     Inverting     Non-Inverting     Power     Summing    

Op Amp


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  GCSE    Op Amps  0 of 30    Question 1080    Comparator 
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Deadline not set10 of 30    Question 1497    Op Amp 
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Operational amplifiers have a very high open loop gain, a high input impedance and a low output impedance.

Amplifiers increase the magnitude of the input signal.

With this amplifier, the output voltage is bigger and it's inverted.

Inverting Amplifier Gain

Amplifiers have one or more of the following properties.

The 741 Operational Amplifier

Data Sheet

741 Op Amp Pin Connections

Pins

  1. Offset Null - Rarely used. It can be used to to adjust for small errors in the two inputs so zero volts in gives zero volts out.
  2. Inverting Input - If this voltage goes up, the output voltage will go DOWN unless the Op Amp is already saturated.
  3. Non-Inverting Input - If this voltage goes up, the output voltage will go UP unless the Op Amp is already saturated.
  4. The minus supply - Sometimes this is connected to zero volts ( ground ).
    Sometimes it's connected to a voltage between -5V and -18V or more for a few specialised op amps.
  5. Offset Null - Rarely used. It can be used to to adjust for small errors in the two inputs so zero volts in gives zero volts out.
  6. The Output - In an ideal Op Amp, the maximum and minimum output voltage is equal to the power supply voltages.
    In a real life Op Amp, these voltages are 2 to 3 Volts less.
  7. The plus supply - Voltages from +5V to +18V are common.
    There are specialist and more expensive Op Amps with a higher voltage ratings.
  8. No Connection - This pin is not used.

The 741 is a low cost operational amplifier. It has ...

It can be used to make ...

Feedback Resistors >= 1k and <= 1M

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