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Op amp circuit for generating Spirograph like curves

Op Art

Making the most of non-ideal components in a non-ideal world.

Multislope ADC

An analog computer for solving sets of Lorenz attractor differential equations

Analog Lorenz Attractor Computer

CMOS Homemade Operational Amplifier module and a photo detector using it.

CMOS Homemade Operational Amplifier

mitsuru-yamada Mitsuru Yamada

An "effect box" which works as octave-down effect (halves input frequency). No internal oscillator involved, no PLL, just analog maths!

Analog oscilator-less octave-down effect box

ms-boss MS-BOSS

Rogowski coil current sensor using cheap shunt regulators as opamps.

TL431 rogowski coil current sensor

Adjustable voltage reference circuit with 0-9.99 V output. Output voltage is set with 3 digit pushwheel switch

Adjustable Voltage Reference with OPAMP 741

Configurable gain and bandwidth current sense amplifier. DC to 1MHz/100kHz bandwidth, at 25x/50x gain.

"High" Bandwidth - Current Sense Amplifier

jesse-farrell Jesse Farrell

This simple circuit with an Op Amp LM358 produces a characteristic sound triggered by a flash of light, a touch or an electromagnetic pulse.

Triggered Sound Generator

burkhard-kainka Burkhard Kainka

Can you hear the difference between Op Amp´s? Yes! With this headphone amplifier.

Listen to the Op Amp´s

stephan-martin Stephan Martin

A minimal 4-wire milliohm meter with 4.5 digit display

SDO Milliohm Meter v1

kuba-sunderland-ober Kuba Sunderland-Ober

Voltage is set with three BCD switches with a step of 10mV

Fully analog digitally controlled voltage source

A proof of concept which demonstrates how analog op amps can perform digital logic functions.

OP-Amps Gone Digital - A BCD to 7 Seg Converter

Home made thermocouple and an analog cold junction compensator which gives output voltage directly proportional to temperature in °C

Thermocouple Amplifier

rudraksha-vegad Rudraksha Vegad

Mid-70s CMOS called and wants the past dues

4000 Series Logic Reference Cards

kuba-sunderland-ober Kuba Sunderland-Ober

Analog robot that uses two light dependent resistors to guide the robot towards a light source, and also reverse if it gets too close

Analog Light Chasing Robot

CustomElectronics

A basic demonstration of Op Amp as Differential Amplifier

RGB LED control with Op Amp and ADXL335

I overheard some co-workers talking about a project that turned a PC Hard Drive into a speaker and I couldn't resist building one

Hard Drive Voice Coil Speaker

ted-sheflin Ted Sheflin

An intelligent pet feeder that dispenses food on a timer, detects your pet’s presence, and signals the end of the meal – all with an ESP32.

ACEBOTT Smart Home: Automatic Pet Feeder

aula-jazmati Aula Jazmati

Combining basic opamp circuits for oscillators, comparators, inverting amplifiers with diode logic to create interesting RGB LED effects

Rainbow LED Effects using PWM Generated by OpAmps

bornach bornach

Op-amp based sine generator for FlySky Radio Controlled Transmitter.

Sine Control: Analog Computer for RC Tx