Operational Amplifiers-741

INDEX

MY EXPERIENCE IN AUTONOMOUS ROBOTICS

OPAMP
LM324
Start with Circuits of lm324
Why comparator prefered over transistors
IC741
Why LM324 over IC741

IC741

We mostly use IC 741 as amplifier,adder,subtractor, adder cum subtractor. I am not giving more explanation because you can easily get circuit in internet or normal class texts. See the circuits of amplifier,adder,subtractor. I will give more examples in Sun Tracker and Light Following Robot.

http://www.uoguelph.ca/~antoon/gadgets/741/741.html

Power supply voltage                              +/-3V to +/-18V
Maximum differential input voltage         30V
Maximum voltage to either input              15V
Maximum power dissipation                 500mW
Open-loop voltage gain                         100,000
Input Resistance                                    2Mohm
CMRR                                                90dB
Slew Rate                                        .5V/uS

The 741 has two inputs and one output. The difference between these two inputs is amplified and that is what appears at the output. For this reason, the 741 is sometimes called the DIFFERENCE AMPLIFIER or COMPARATOR.

Normally we use -Vcc = -12V and +vcc= +12V which is preferred over +/-15V because it is easy to generate for us. See the power supply section for the ckt to generate +/-12v from 230V AC.