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Arduino + Franklin oscillator
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Turning Impedance into Frequency: An LC Experiment

nobchanobcha

Open-source LoRa station for IoT — receives sensor data via LoRa and forwards it to the internet over 4G/LTE.
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Loko IoT Data Collection Station — Solar Powered

akio-satoAkio Sato

Spoiler alert: not yet... but maybe we can we use this technology for scientific discovery in the future?
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Proving the Goldbach Conjecture with ChatGPT?

michael-wesselMichael Wessel

A simple isolated current meter for measuring higher currents with good resolution based on hall effect sensor.
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DIY Current Meter using a Ferrite Core

sagar-001Sagar 001

A retrosystem based on the elegant 8/16 bit 6809 processor capable of running UniFLEX and OS9 level II multiuser/multitasking OS
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6809/6309 Eurocard CPU System

roelof4roelof4

Mini-PI Media Server for use on home network or as a wifi access point to stream media from
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Mini-PI Media Server

diddydiddy

Open-source bipedal robot powered by Raspberry Pi 4B. Features IK-based gait, 30kg.cm bus servos, and DeepSeek LLM integration for AI resear
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SamuRoid: 22-DOF Embodied AI & ROS Humanoid

alisawualisa.wu

This is another camera body based on Raspberry Pi HQ Cam
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JDC34 Camera

jacob-david-c-cunninghamJacob David C Cunningham

A full-featured Forth-based RTOS for ARM Cortex-M
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zeptoforth

travis-bemannTravis Bemann

Reverse-engineering (mostly-)cheap eBay finds
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Avionics + mil-spec teardowns

don-straneyDon Straney

Open-source, low-cost 10.5 GHz phased array radar with phased array antenna and Pulse LFM modulation; available in 3km and 20km range
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Open Source Pulse Linear Frequency Modulated Phase

nawfal3nawfal3

RetroChallenge 2025/10 Blog
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3D Graphics on the Microprofessor MPF-1B

michael-wesselMichael Wessel

im using an old cine film viewer and converting it into a film scanner
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Double 8mm &16mm film scanner

bozzer91bozzer91

Im trying to make a digi cuper 8 cart ( yes I may have gone insane)
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Digital Super 8 Cart

bozzer91bozzer91

Design of a High-Performance Sound Card Based on PCM1792, SRC4193, and TPA6120
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Building a high-quality sound card from scratch

sylwesterSylwester

Using 5 cheap BJT (BC547) I built a small, cheap and easy class C QRP amplifier for HF bands.
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1-30 MHz 0.5-1W class C amplifier

guidoGuido

Going up?

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