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Transcript
Op-Amps Operational Amplifiers 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. The Op-Amp Symbol Inverting input - +Vs Output Non-inverting input + -Vs The 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. 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. + Vs 9 Volts 0V 9 Volts - Vs