EE215: Fundamentals of Electrical Engineering
EE 215 - Laboratory 3 - Operational Amplifiers (Op Amps)
C. Ramon, R.D. Christie, K.F. Böhringer
At the end of this lab, you will be able to:
Construct and test inverting and non-inverting op amp circuits
Compute the input and output resistance of op amp circuits from measurements.
Design simple op amp circuits
Materials and Supplies
See Laboratory 1 for information on obtaining a laboratory parts kit and multimeter, and for identifying many of the
parts used in Laboratory 3.
Parts for This Lab
Figure 1 - LM741 pin out (top view)
The new part used in this lab is the
LM741 Op Amp
. It is
the small 8-legged black plastic bug-like thing. This
component form, or package, is called an 8-pin Dual
Inline Package, or DIP. DIPs of different sizes (pin
counts) are used for many types of integrated circuits. The
op amp for this lab may be marked
LM741 or HA17741,
and may be from National, Hitachi, or another
The number 741 indicates the basic functionality of the
part, e.g. op amp, inverter, or AND gate. 741 is a general
purpose operational amplifier.
Letters and numbers preceding 741 indicate the type of
process used to make the component, e.g. CMOS or TTL.
Letters following 741 usually indicate the package type,
e.g. plastic, ceramic, DIP or surface mount.
The op amp may be marked with a dot in one corner of the top, or a notch in one end, or both. Pin 1 is at the corner
with the dot. Pin 1 is the pin in the corner to the left of the notch, looking down. Pin numbering runs counter-
clockwise from pin 1. Looking down on the op amp, with pin 1 in the upper left corner, pin 4 is in the lower left
corner, pin 5 in the lower right corner, and pin 8 in the upper right corner. See the pinout in Figure 1. Note that the
op amp symbol is NOT printed on the package.
Data sheets can be found at
and other IC manufacturer sites. Use the part number, LM741, to