---
title: "Op Amp Circuits by Bob Pease"
description: "(/wp-content/uploads/2017/09/TI-AN-31-Torn-Paper.jpg)](/wp-content/uploads/2017/09/TI-AN-31-Torn-Paper.jpg) Op amps are one of the most versatile ICs in electronics. A purely…"
canonical: "https://www.baldengineer.com/op-amp-circuits-bob-pease.html"
author: "James Lewis"
date: "2017-09-27T17:45:07Z"
lastmod: "2017-09-27T17:54:13Z"
categories: ["blog","components","tutorials"]
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---

# Op Amp Circuits by Bob Pease


[![TI AN-31 Torn Paper](/wp-content/uploads/2017/09/TI-AN-31-Torn-Paper.jpg)](/wp-content/uploads/2017/09/TI-AN-31-Torn-Paper.jpg)

Op amps are one of the most versatile ICs in electronics. A purely analog device, they can be used for amplification, summing, integration, and a whole host of other circuits. [AN-31 from Texas Instruments](https://www.ti.com/ww/en/bobpease/assets/AN-31.pdf) is 32 pages of op amp circuits. (Note: this document was created before TI acquired National Semiconductor.)

Even more amazing is that the author is [Bob Pease](https://en.wikipedia.org/wiki/Bob_Pease). If you never heard of Mr. Pease, please spend a few minutes right now reading this [TI page dedicated to him](http://www.ti.com/ww/en/bobpease/). His contributions to electronics are nearly immeasurable. (Sadly, he was involved in a car accident after attending the funeral of his equally famous engineering friend, Jim Williams.)

[Download AN-31 from TI](https://www.ti.com/ww/en/bobpease/assets/AN-31.pdf)


([Mirror](/wp-content/uploads/2017/09/TI-AN-31.pdf))

Regarding Op Amps, circuits found in this application note include:

- Inverting Amp
- Non-Inverting Amp
- Difference Amp
- Inverting Summing Amp
- Non-Inverting Summing amp (with High Input Impedance)
- Fast Inverting Amp with high input impedance
- Non-inverting AC Amplifier
- Practical Differentiator
- Integrator
- Fast Integrator
- Current to Voltage Converter
- Threshold Detector for Photodiodes
- Double-Ended Limit Detector
- Multiple Aperture Window Discriminator
- Offset voltage adjustment op-amp based amplifer types
- Sine Wave Generators
- Free-running multivibrator (eat that 555!)
- Wein Bridge Size Wave Oscillator
- Function Generator (Square and Triangle Wave Outputs)
- Pulse Width Modulator (forget anlaogWrite()!)
- Bilateral Current Source
- Positive voltage reference (Use it with as a [Zener "Regulator"](/zener-diode-regulators.html))
- Negative voltage reference
- Precision Current Sink
- Precision Current Source
- Instrument Amplifiers
- Precision Clamp
- Fast Half Wave Rectifier
- Precision AC to DC Converter
- Low Drift Peak Detector
- Sample and Hold
- Tunable Notch Filter
- Variable Capacitance Multiplier
- Simulated Inductor (what?!)
- High and Low Pass Filters
- Current Monitor
- Power Booster
- Analog Multiplier
- Fast Zero Crossing Detector
- Piezoelectric Transducer Amplifer
- Temperature Probe
- Photodiode Amplifier
- Temperature compensated logarithmic converter
- Root Extractor
- Cube Generator
- Anti-log generator
- ... and more

I skipped some of the repeats and variants. But seriously. Can you believe how many different circuits that be built from the humble operational amplifier? To be perfectly honest, I don't even recognize some of those circuits. But. Seeing them in this application note makes me want to go and build them.

[Download AN-31 from TI](https://www.ti.com/ww/en/bobpease/assets/AN-31.pdf)


([Mirror](/wp-content/uploads/2017/09/TI-AN-31.pdf))