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

michael-wesselMichael Wessel

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

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

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

jacob-david-c-cunninghamJacob David C Cunningham

Forced Open source HardWare of Flipper zero, suitable as hobby DIY project
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Fu**g cheap Flipper Zero FcFz

gthinGthiN

A competition electric vehicle built around the idea of precise, repeatable motion, using feedback and onboard adjustment to control motion
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Sprint Zero - A Science Olympiad EV

bolan-xuBolan Xu

low-cost e-ink typewriter
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etyper

quackieduckieQuackieduckie

Made a Terminal PC from fallout, powered by Raspberry Pi 5
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VAULT-TEC Air Terminal

arnov-sharmaArnov Sharma

My rowing machine is almost useless without a $30 per month subscription. I would like to change that.
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Jailbreaking a rowing machine

tom-callahanTom Callahan

Button field 35 buttons. Normal mode - control. Symbol and service character modes are called by holding one of the function buttons.
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Reflections on the Portable HMI - 2

slpostmannSl_Postmann

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 Eurocard CPU System

roelof4roelof4

Keep your resin at the right temperature with this USB-PD powered vat heater featuring ESP32 control, dual channels, and fan support.
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Vat Heater for Resin 3D Printers

dimitarDimitar

A home plant watering device based on a simple 8-pin PIC microcontroller and 74HC chips.
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Home Plant Watering System Based on the PIC10F202

robert-gawronRobert Gawron