This discussion has been closed.
Posted by BitesizePhysicsTeacher (U15165682) on Saturday, 26th January 2013
The circuit diagrams for operational amplifiers can be a bit daunting to look at, and there will be a couple of other posts after this one to deal with the more complex types of circuits that sometimes come up in papers.
The simplest type of op-amp circuit is the inverting mode operational amplifier -
+ only one input voltage, V1 , to the inverting input (-), via resisitor R1
+ non-inverting input connected to zero volts (i.e. V2 = 0 V)
+ feedback resisitor, Rf, connects output, Vo , to the inverting input
circuit diagram can be found here - www.bbc.co.uk/bitesi...
For all inverting mode op-amps, the output is given by the formula -
Vo = - Rf/R1 x V1
** N.B. the output voltage always has the opposite sign to the input voltage **
** if the calculated value of Vo is greater than Vs, the supply voltage, then the output will SATURATE, as no amplifier can produce a voltage larger than its supply.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.