Figure 
shows an operational amplifier with an open-loop
voltage gain A.
The terminals labeled 
and 
are power supply
connections to the op-amp and set limits on the voltage which can be produced at
the output node.
The op-amp we will be using is the 747 as shown in Figure . The
747 is a dual op-amp integrated circuit (IC) containing two 741 op-amps.
To use this IC, you must insert it into your board as shown in Figure .
When properly positioned, the op-amp straddles the gap in the middle of the
terminal strip with the 14 pins snuggly fit into individual holes in the
terminal strip. Observe the notch at one end of the op-amp chip. This notch
is used for orientation and identification of the pins. With the notch positioned
as shown, pin 1 is always to the left of the notch.
Figure: Proto Board with inserted 747.