Learn 741 op-amp circuits basic with example

Transconductance Amplifier 

This circuit is a voltage-to-current converter . Here's how it permits an input voltage to control the brightness

of an LED

R3 controls Vin , Vary R3 to alter Iout, hence the brightness of the LED.

Transimpedance Amplifier 

Example : If R1 = 1000 Ohms then Gain = -1000

This circuit is a current -to-voltage converter. Here's how it transforms the current generated by a solar cell into an output voltage :

.

This circuit can amplify the signal from non-current generators like thermistors and photoresistors. connect one side of device to +9V and the other to pin 2 , ground pin 3. 

Op Amp IC 741 Basics, Characteristics, Pins, Applications

The 741 is a highly popular general purpose OP-AMP. It is simple to use , reliable, and inexpensive, it is used in most circuits.

IC OP-AMP 741

741 PINS

IC 741 Pin Out

Maximum Ratings

Supply Voltage                         +/-18 Volt

Power Dissipation                      500 mW

Differential Input Voltage        +/-30 Volt

Input Voltage (note)                 +/- 15 Volt

Output Short Circuit Time       Indefinite

Operating Temperature            0 Celcius to 70 Celcius Degree

Note : Input Voltage should not exceed supply voltage when supply voltage is less than +/- 15 Volts

741 Applications Circuit

Basic Inverting Amplifier Design 

Basic Inverting Amplifier

Example : if R1 = 1000 Ohms and R2 = 10000 Ohms, then Gain is -(10000/1000) or -10.

This is one of the most common OP-AMP circuits. For A Non-Inverted output use the amplifier on the facing page.

example the application of basic inverting amplifier is Unity-Gain Inverter Circuit :

This circuit use as a buffer or to convert -Vout to +Vout

Non-Inverting Amplifier Design

Non-Inverting Amplifier

Example: If R1 = 1000 Ohms and R2=10000 Ohms, then Gain is 1 + (10000/1000) or 11

Note that Vout is an Amplified but not inverted version of Vin.

Example of Non-Inverting Amplifier application is Unity-Gain Follower circuit.

Use to buffer signal from another circuit