• Skip to main content
  • Skip to primary sidebar

Making Easy Circuits

Learn and build electronic circuits

You are here: Home / Audio and Amplifier / 24 Best Opamp Amplifier Circuits

24 Best Opamp Amplifier Circuits

Last Updated on November 16, 2024 by Admin 2 Comments

The article explains 24 types of amplifier configurations using op amps.

Difference Amplifier Circuit

By simply employing a couple of inputs as demonstrated, a difference amplifier containing the differential between U1 and U2, times a gain factor results.

fig2 3

Fast Inverting Amplifier With High Input Impedance Circuit

U1 is utilized like a voltage follower to supply inverter U2, Since U1 is with the voltage follower circuit, it shows a higher input impedance.

fig1 44

Noninverting AC Amplifier Circuit

A universal noninverting ac amplifier for sound of other low frequency implementations is displayed here, Layout equations are shown in this figure.

fig1 45

Nearly every standard objective op amp can easily be employed for U1.

Inverting Summing Amplifier Circuit

The output of U1 is obtained by adding V1, V2, and V3, and multiplying by R1/R4, R2/R4, respectively. R1, R2, R3 are chosen as needed for desired benefits, R4 influences gain of all these inputs.

fig1 46

Nonlinear Operational Amplifier With Temperature Compensated-Breakpoint

fig1 47

Mosfet High Impedance Biasing Method Circuit

High impedance biasing method for an N channel MOSFET to create a linear inverting amplifier.

fig1 48

Bootstrapped Source Follower Circuit

This bootstrapped source follower employs an N channel MOSFET. It includes with a higher input impedance.

fig1 49

30 MΩ JFET Source Follower

This JFET source follower employs an MPF102 using offset biasing. It includes an input impedance of >30 MΩ

fig1 50

JFET Source Follower Circuit

The circuit employs positive gate bias to enhance the functioning point for improved dynamic range.

fig1 51

Unity Gain Noninverting Amplifier Circuit

Biasing techniques for an N channel MOSFET to make a unity gain noninverting amplifier or source follower.

fig1 52

JFET Amp With Current Source Biasing Circuit

A current source (MPF102) in the source pin of bipolar transistor 2N3906 enables exact charge of drain current.

fig1 53

Electret Mike Preamp Circuit

This circuit works with an electret microphone and can be used for several applications.

fig1 54

A 1.5-V battery is employed. C1 and R3 supply treble boost/bass cut; they could be eradicated, if preferred.

General Purpose JFET Preamp Circuit

This JFET preamplifier includes a gain of around 20 dB and also a bandwidth of above 100 kHz. Its helpful like a low level sound amplifier for large impedance inputs.

fg1

FET Amplifier With Offset Gate Bias Circuit

With this amplifier circuit, the gate of the MPF102 is biased using an external voltage.

fig1 55

This circuit accomplishes stronger regulation of the working point and biasing conditions.

Push Pull Darlington Amplifier Circuit

This circuit incorporates a larger Z input and push pull output through the output obtained around R4 and R6.

fig1 56

Noninverted Unity Gain Amplifier Circuit

An op amp works extremely well as a unity gain amplifier simply by linking its Output to its inverting input as demonstrated.

fig1 57

R1 needs to be lower enough so that the bias current of the op amp won't trigger an noticeable offset.

500Ω Input Impedance With JFET Amp Circuit

A current source employing a 2N3904 transistor as well as bootstrapping, accomplishes an input impedance of 500 MQ.

fig1 58

The other ZN3904 transistor could be included at X to lessen the output impedance.

Discrete Current Booster Amplifier Circuit

Appropriate as a line driver, this circuit is able to be used in several related sound applications.

fig1 60

Frequency Counter Preamp Circuit

Using the LM733 or NE592, the preamp demonstrated includes a bandwidth of 100 MHZ.

FIG1 8

The FET inputs supply around 1~MQ input impedance. Q4, Q5, and IC2 deliver signal conditioning.

Audio To UHF Preamp Circuit

The Signetics NE5204 or NE5205 can be employed within this AF to 350-MHZ (-3O dB) preamp.

fig1 61

In case 600 MHZ @ 3 dB is required, make use of NE5205. The sound figure is 4.8 dB at 75 Ω, 6 dB at 50Ω. Gain is around +20 dB above the passband.

Voltage And Current Protected Intrinsically Safe Opamp Circuit

The circuit is built to operate an external load. An error situation in the external load circuit can provide extreme current or voltage feedback into the line drive circuit.

fig1 62

In case too much voltage seems from the load, the a couple of zener diodes may fix that voltage to a safe level, that in this instance is 10 V.

The current in the zener diodes, op amp, and the remainder of the circuitry is fixed to some secure level by resistors R1, R2, and R3. D1 guards the op amp output stage through 10 V showing up around the clamp diodes below a fault situation.

The benefit of this circuit is that, even though it's developed as unity gain buffer, a similar methods could be placed on inverting, noninverting, or differential gain stages.

Current Feedback Amp Delivers 100 ma @ 100 MHz Circuit

Making use of a NS LM6181, this IC is handy in cable drivers. The supply voltage is +/-5 V to +/-15 V.

fig1 63

General Purpose Preamplifier Circuit

Appropriate for standard audio applications, the preamp circuit works with a feedback pair, Current gain is fixed with the ratio of (R4 + R6)/R4.

fig1 64

Test Bench Amplifier Circuit

This amplifier could be beneficial in repairing or bench testing as a signal tracer or as a universal module in several applications.

fig11

You'll also like:

  • 1.  Design your Own Notch Filter Circuits
  • 2.  Simplest FM Radio Circuit with High Reception Quality
  • 3.  Single IC High Power Siren Horn Circuit
  • 4.  Sea Surf Sound Effect Simulator Circuit
  • 5.  Simple Radio Circuit
  • 6.  2 Simple Electronic Gong Circuits Explained

About Admin

Hey friends, Thanks a bunch for stopping by this site! I am an engineer with a Bachelor of Engineering in Electronics and Telecommunication. One of my passions is gathering information from all sorts of electronics books and tutorials. I then take that information and compile it into a language that is super easy to understand. My goal is to make those complex electronics circuit concepts and technical terms much more accessible for all the new and budding electronics engineers out there. I can also design customized circuit diagrams as required by the users.
If you have any questions related to this field, please do not hesitate to drop a comment! I am always here and ready to help you out with any queries you might have. I cannot wait to hear from you!

Reader Interactions

Comments

  1. Matthias says

    April 25, 2022 at 3:16 am

    Unfortunately drawings of circuits are blurred.
    What does it mean, that “R1 needs to be lower enough so that the bias current of the op amp won’t trigger an noticeable offset”. What is order of magnitude of value R1?

    Reply
    • Brad says

      April 16, 2023 at 5:21 pm

      You can think of bias current as leakage from the op-amp. It is usually in the microamp to picoamp range. Check the data sheet for the ranges. Then using Ohm’s law, you can calculate how much voltage the current will generate. If the voltage offset is to much, reduce the resistor value. Best choice would be to match the output resistance of whatever is feeding the voltage follower circuit.

      Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Categories

  • 3 Phase (4)
  • 8051 Microcontroller (1)
  • Arduino (11)
  • Audio and Amplifier (102)
  • Automation (8)
  • Battery Chargers (64)
  • Bicycle Projects (4)
  • Car and Motorcycle Projects (39)
  • Datasheets (10)
  • DIY Projects (5)
  • Electrical (15)
  • Free Energy (6)
  • Games Projects (2)
  • High Voltage (14)
  • Hobby Projects (30)
  • Household Circuits (2)
  • IC 555 Circuits (5)
  • Ignition Circuits (2)
  • Indicators (50)
  • Infrared (6)
  • Inverter Circuits (29)
  • Lights and Lamps (97)
  • Medical (8)
  • Meter and Tester Circuits (38)
  • Motor Driver (17)
  • New Circuits (56)
  • Oscillators (30)
  • Pets and Pests (5)
  • Power supply (80)
  • Protection Circuits (25)
  • PWM (9)
  • Remote Control (20)
  • Security and Alarm Circuit (48)
  • Sensors and Detectors (66)
  • Signal Processor (23)
  • Solar Controller Circuits (62)
  • SSR (3)
  • Temperature Controller (20)
  • Timer (25)
  • Transformerless (7)
  • Transmitters (12)
  • Tutorials (45)
  • UPS (2)
  • Voltage Regulators (57)
  • Water Sensor and Controller (29)
  • Home
  • Privacy Policy
  • Contact
  • Disclaimer
  • Copyright

© 2025 · Making Easy Circuits