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Op amp circuit for generating Spirograph like curves

Op Art

Modern take on TIL311 and reimagination of #PICTIL optimized for easier production and lower part count

reTIL

Homemade simple operational amplifier module and an audio amplifier using it

Homemade Operational Amplifier

mitsuru-yamada Mitsuru Yamada

An analog computer for solving sets of Lorenz attractor differential equations

Analog Lorenz Attractor Computer

LED array that lights up in response to motion and sends waves across the array.

interactive analog LED wave array

Use lightbulbs to store data!

Incandescent RAM

eric-hertz Eric Hertz

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

2021 Hackaday Prize

Exactly as the title says, these are a few retro led displays I've strung together to make 16x2 modules with some software I wrote

Retro Alphanumeric LED Displays + Libraries

sjm4306 sjm4306

Plugging modules in modified prototype boards allows an affordable and flexible analog computer system with unusual features

Flexible Analog Computer

rainer-glaschick Rainer Glaschick

Another Operational Transconductance Amplifier - a humble attempt to provide a tolerant discrete design for a vital opamp type

AORTA

A minimal 4-wire milliohm meter with 4.5 digit display

SDO Milliohm Meter v1

kuba-sunderland-ober Kuba Sunderland-Ober