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Oa-07: Oa-07 Current Feedback Op Amp Applications Circuit Guide - National Semiconductor Application Note  (app note added 2/06)

Oa-11: Oa-11 a Tutorial on Applying Op Amps to RF Applications - National Semiconductor Application Note  (app note added 2/06)

Oa-18: Oa-18 Simulation SPICE Models for Comlinear's Op Amps - National Semiconductor Application Note  (app note added 2/06)

Oa-19: Oa-19 Wideband Op Amp Capable of µPower Operation - National Semiconductor Application Note  (app note added 2/06)

Oa-22: Oa-22 Pushing Low Quiescent Power Op Amps to Greater Than 55dbm 2-Tone Intercept - National Semiconductor Application Note  (app note added 2/06)

OA-25: OA-25 Stability Analysis of Current Feedback Amplifiers - National Semiconductor Application Note  (app note added 2/06)

Op Amp Bandwidth - ...(spice design added 02/09)

Op Amp Booster Designs - National Semiconductor Application Note  (app note added 2/06)

Op Amp Circuit Collection - National Semiconductor Application Note  (app note added 2/06)

Op Amp Comparator & Reference IC Provides Micropower Monitoring Capability Design Note 190 - DN190  Design Notes (Linear Technology) (app note added 1/06)

Op Amp Comparator & Reference IC Provides Miscropower Monitoring Capability - Linear Technology Design Notes 190 (app note added 02/05)

Op Amp Comparator with Hysteresis - The challenge sounds simple enough, take a 60 Hz (or 50 Hz) sinewave from the AC power line and convert it to a square wave. This signal will serve as a clock to drive counters for a 24 hour time clock. So you hook up an op amp as a comparator to do the job. But your surprised to see the clock running too fast! With oscilloscope in hand you discover the AC line is noisy! And to your horror, you see glitches ...(spice design added 02/09)

Op Amp Differentiator-Open Loop Analysis - ...(spice design added 02/09)

Op Amp Feedback Analysis - ...(spice design added 02/09)

Op Amp Input Voff & Ibias - ...(spice design added 02/09)

Op Amp Limiter - ...(spice design added 02/09)

Op Amp Macro-Models - ...(spice design added 02/09)

Op Amp Output Impedance Apex-AN10 - Apex App Note (added 08/08/08)

Op Amp PID Controller - We've all heard about the wonders of the PID controller, bringing a system's output, temperature, velocity, light, to its desired set point quickly and accurately. But now, your boss says okay, design one for us. Although there's a number of ways to do it, the circuit above nicely separates the three terms ...(spice design added 02/09)

Op Amp Provides On-The-Fly Adjustable Current Limit - DN298  Design Notes (Linear Technology) (app note added 1/06)

Op Amp Radio - Here is a simple radio that is easy to build and inexpensive. In fact, you probobly have all the parts you need in your junk box. You'll be suprised at the great reception with this little set. The antenna can be a piece of wire or a telescoping antenna...(electronic circuit added 7/03)

OP-AMP (pdf) - ….(electronic schematic added 06/09)

Opamp Based Power Amplifier - This is a contributed project, and has some interest as a learning exercise  (circuit added 6/07)

Opamp Basics - The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output impedance. The op-amp has a "inverting" or (-) input and "noninverting" or (+) input and a single output. The op-amp is usually powered by a dual polarity power supply in the range of +/- 5 volts to +/- 15 volts. A simple dual polarity power ..... (circuit added 7/02)

Opamp Booster Designs  - National Semiconductor Application Note 09-Apr-1996 (app note added 4/02)

OpAmp can source or sink current - 03/02/06 EDN-Design Ideas:  Bipolar current source beats familiar Howland-current pump.....(design idea added 10/06)

Opamp Circuit Collection  - National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)

Opamp Design & Test Board - Quickly assemble an opamp circuit for testing.  Very easy and intuitive to use  (electronic schematic / circuit added 4/02)

OpAmp Doubles as Instrumentation Amp - 09/15/94 EDN-Design Ideas:  The circuit in Fig 1 shows an ordinary, off-the-shelf, general-purpose op amp configured as an instrumentation amplifier. Such a configuration yields an instrumentation amplifier having higher bandwidth than currently available dedicated instrumentation..../.....(design idea added 4/02)

OpAmp Improves Power Supply's Regulation - 06/06/96 EDN-Design Ideas:  A typical power supply has a voltage-regulation specification of 2 to 3% for all conditions, including initial setting, line, load, and temperature. You can improve regulation if the power-supply has remote-sensing capability, however.....(design idea added 5/03)

OpAmp Increases Potentiometer's Resolution - 06/05/00 EDN-Design Ideas:.....(design idea added 11/05)

Opamp Integrator - The integrator basically works like this: whatever current I you get flowing in R1, gets integrated across capacitor C1. The output voltage Vo is simply the voltage across C1. One great application of the integrator is generating a ramp voltage. You can do this by placing a fixed voltage....(electronic schematic design added 02/05)

OpAmp Linearizes Attenuator Control Response - 07/25/02 EDN-Design Ideas:    Professional-audio equipment commonly uses Analog Devices' (www.analog.com)high-performance, quad-voltage-controlled SSM2164 attenuator. The control response is -30 dB/V, with 0V producing unity gain. Attenuation increases as the applied.....(design idea added 03/03/03)

OpAmp Linearizes Response of FET Vca - 09/05/02 EDN-Design Ideas:  FETs find common use in VCAs (voltage-controlled amplifiers)and attenuators, in which the FET serves as a variable resistance. A control voltage applied to the gate sets the channel resistance and overall circuit gain.....(design idea added 03/03/03)

OpAmp Makes Precise 9 Volt Battery Splitter - 07/17/97 EDN-Design Ideas:    -Alkaline 9V batteries are ideal for many portable, handheld applications, this circuit generates a bipolar supply of5V and ­2.3 to ­4V using a precision5V reference and one op amp as a supply splitter.....(design idea added 03/03/03)

OpAmp Oscillators Simplify RF Designs - 10/10/96 EDN-Design Ideas:  (design idea added 03/03/03)

Opamp Radio (Aaron Cake) - (electronic schematic / circuit added 04/03/02)

OpAmp Rectifier Signals Input State - 07/21/94 EDN-Design Ideas:  The op-amp rectifier in Fig 1 operates from a single supply and provides a logic output and an LED that indicate the state of the input voltage. The input-state indications are handy for calibration. Because the circuit operates from a single supply, the 2.5V reference determines the level around which the circuit rectifies input waveforms.....(design idea added 03/03/03)

Op-Amps Basic Circuits for the beginner. - The 7 Basic Circuit Configurations for op-amps  ….(electronic schematic added 12/08)

OpAmps Make JFET Circuits Repeatable - 05/24/01 EDN-Design Ideas: (design idea added 8/03)

Operational Amplifier AC Specifications & Applications - Microchip Application Note Published 3-Apr-01  (app note added 2/06)

Operational Amplifier Selection Guide for Optimum Noise Performance #2 - DN3  Design Notes (Linear Technology) (app note added 1/06)

Operational Amplifier Topologies & DC Specifications - Microchip Application Note Published 3-Apr-01  (app note added 2/06)

Operational Integrators - AN-357 Analog Devices Application Notes  (app note added 6/06)

Optical Magnetic Projection Booth System - (diagram added 6/03)