DiscoverCircuits.com, has 28,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to material posted by the designer. 
Please let us if you would like us to link to your design.

The Monolithic Operational Amplifier: A Tutorial Study - National Semiconductor Application Note  (app note added 2/06)

Timer Exploits OpAmp Bias Current - 07/21/94 EDN-Design Ideas: The simple, low-cost analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors. After all, because the input-bias current is the minimum current flow into an op amp, this method produces the longest time delays possible from a given capacitor and op amp.....(design idea added 5/03)

To 3 Case Low Power Amplifier  - (diagram added 6/03)

Topics on using the LM6181 New Current Feedback Amplifier  - National Semiconductor Application Note 05-Aug-1995 (app note added 4/02)

Transformerless Microphone PreAmplifier  - (diagram added 6/03)

Transimpedance Amplifier - You may have noticed that most circuits work on a convenient principle: Voltage In, Voltage Out. But, what about the large class of sensors, such as a photodiode, that produce a current? Photodiodes may be called into action for applications such as precision light meters or high-speed fiber-optic receivers. If you need to amplify the signal from this type of sensor, you must first convert this current to a useful voltage...(spice design added 02/09)

Transimpedance synchronous Amplification nulls out background illumination - 12/03/07 EDN-Design Ideas: In optical spectroscopy a correct intensity measurement of the probe beam is fundamental during material characterization. 

Tutorial on Applying OpAmps to RF Applications - National Semiconductor Application Note  (app note added 6/06)

Two OpAmps Make Fast Full Wave Rectifier - 03/14/96 EDN-Design Ideas: The circuit in Figure 1 is a precision full-wave rectifier with the following characteristics: Minimal delay time between the input and output (with only one op amp in the chain); Similar delay times for positive and negative inputs; No need to match diodes or adjust resistors.  When VIN>0V, the output of op amp IC1 is negative, ….....(design idea added 1/06)

Two OpAmps Provide Averaged Absolute Value - 10/30/03 EDN-Design Ideas: The circuit in Figure 1 is useful when you need amplitude demodulation or an averaged absolute-value conversion. The circuit comprises two stages, the first of which, IC1A, is a differential-output absolute-value converter. The second stage, IC1B, is a traditional differential amplifier. The combination of the two stages.....(design idea added 1/05)

Two Wire Remote Microphone Amplifie - uses special amplifier module from Op-Amp Labs (added 4/02)

Ultra Low Noise Op Amp Combines Chopper & Bipolar Op Amps - DN36  Design Notes (Linear Technology) (app note added 1/06)

Ultra Low Voltage Differential Amplifier - Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Ultra-Low Noise Low Distortion Audio Op Amp - Linear Technology LT1115  (app note added 6/06)

Unique IC Buffer Enhances Op Amp Designs Tames Fast Amplifiers - AN16 Linear Technology This note describes some of the unique IC design techniques incorporated into a fast, monolithic power buffer, the LT1010. Also, some application ideas are described such as capacitive load driving, boosting fast op amp output current and power supply circuits.

Universal Evaluation Board for Dual High Speed Op Amps in SOT-23-8 Packages - AN-675 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps in CSP Packages - AN-677 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps in SOT-23-5/SOT-23-6 Packages - AN-674 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Dual in MSOP package - AN-648 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Dual SOIC Package - AN-647 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board for High Speed Op Amps-Single in SOIC Package - AN-646 Analog Devices Application Notes  (app note added 2/06)

Universal Evaluation Board of High Speed Op Amps in SC70 Packages - AN-676 Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board - AN-692 Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in MSOP Package - AN-733 Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SC70 Package - AN-734 Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SOIC Package - AN-732 Analog Devices Application Notes  (app note added 2/06)

Universal Precision Op Amp Evaluation Board in SOT-23 Package - AN-735 Analog Devices Application Notes  (app note added 04/05/06)

Unlimited Capacitive Load Drive Op Amp Takes Guess work Out of Design - National Semiconductor Application Note  (app note added 2/06)

Use dual OpAmp in an instrumentation amp - 01/18/07 EDN-Design Ideas: Use op amps of your choice in an instrumentation amplifier.....(design idea added 9/08)

Use OpAmp Injection for Bode Analysis - 09/16/04 EDN-Design Ideas: Bode analysis is an excellent way to measure small-signal stability and loop response in power-supply designs. Bode analysis monitors gain and phase of a control loop. It performs this monitoring by breaking the feedback loop and injecting a signal into the feedback node and then comparing the injected signal with the output signal of the control loop.  (added 10/05)

Use the LM158/LM258/LM358 Dual Single Supply Opamp  - National Semiconductor Application Note 04-Nov-1995 (app note added 4/02)

Using Single Supply Operational Amplifiers in Embedded Systems - Microchip Application Note Published 3-Apr-01  (app note added 2/06)

Using the AD813X Differential Amplifier - AN-584 Analog Devices Application Notes  (app note added 6/06) The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage.

Using the Analog Devices Active Filter Design Tool - AN-649 Analog Devices Application Notes  (app note added 2/06)

Using the LTC Op Amp Macromodels - AN48 Linear Technology LTC's op amp macromodels are described in detail, along with the theory behind each model and complete schematics of each topology. Extended modeling topics are discussed, such as phase/frequency response modifications and asymmetric slew rate for JFET op amp models.....

V 44 Video Distribution Amplifier Schematic  - (diagram added 6/03)

Vacuum Tube Opamp Circuit - Published In Glass Audio #3/1995  (circuit design added 08/08/08)

Video Multiplexer uses High Speed OpAmps - 08/21/03 EDN-Design Ideas: Video multiplexers route video from several sources to a single channel. Low-end consumer products use CMOS analog switches and multiplexers, such as the 4066 and 4051. Unfortunately, these devices have a series on-resistance that ranges from approximately 100Ω to 1 kΩ, a resistance.....(design idea added 10/03)

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

Wien Bridge Oscillator - The opamp Wien-bridge oscillator provides a nice view into classic oscillator design using feedback analysis. Feedback analysis reveals if your circuit is stable (well behaved) or unstable...(spice design added 02/09)

Wien Bridge Oscillator Rail-to-Rail Sine Wave Generator  - Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.  (app note added 6/06)

Working with High Impedance Op Amps - National Semiconductor Application Note  (app note added 2/06)