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Starting electronics
meter round i.e., swap the meter leads over so that the black
lead measures the voltage at pin 6 and the red lead connects
to 0 V, to measure the negative readings.
The results which were taken in my circuit are given in Table
9.2, and your results should be something like this, although
differences may occur. From these results you should see that
the circuit amplifies whatever voltage is present at the input
by about two, so that the output voltage is about twice that
of the input. This is true whatever the input voltage. Don’t
worry if your results aren’t that close to the ideal ones, it’s
only an experiment.
Input voltage
Output voltage
-2 -4.4
-1 -2.1
0 0
1 2.1
2 4.4
Table 9.2
The results of my measurements
This particular circuit is a fairly basic amplifier which simply
amplifies the input voltage. For one reason or another, which
you’ll appreciate soon, it’s called a non-inverting amplifier.
Its gain is given by the expression:
and if you insert the values of resistors R1 and R2 into this
expression you will see why the circuit gives an experimental
gain of about two.
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