2 What is an Op-amp ?An op-amp is a type of amplifier – an operational amplifier.It takes in one or more voltages ( V1 and V2 ) and processes them, giving out another voltage ( Vout ).Depending on how it is connected up, the op-amp seems to carry out mathematical operations such as addition, subtraction etc.
3 The Op-Amp Symbol+VsInverting input-OutputNon-inverting input+-VsThe Op-Amp needs a power supply to make it work. This is represented by Vs.The power supply connections are often missed out in diagrams.
4 Power Supplies for Op-Amps The power supplies used with Op-Amps are a bit unusual. They are set up to have a positive terminal and a negative terminal and a zero volts terminal between the two.The zero volts terminal acts as a reference voltage when making measurements.