Optoelectronics and display technology

Image	Description	Year
	45W LED Driver Adjustable 700mA constant current driver for 12 volt operation	2022
	LED Message Programmable LED ticker with 5x7 dot matrix and USB connection (AATiS e.V. AS115)	2015
	AVR Flashlight Controller 700mA constant current driver for flashlights with one lithium cell	2013
	LED Scroller 5x7 Dotmatrix LED display for a slightly different birthday card	2013
	Night Vision Device DIY Night Vision Device with IR Spotlight and CMOS Camera	2010
	Video tape recorder VFD Vacuum fluorescence display controlled with an Atmel microcontroller	2005
	Ultra Low Power LED Flashlight using a 1.5V cell	2007
	Eternal flasher Low power circuit for eternal flashing	2007
	LED flasher Flash circuit with PNP and NPN transistor	2002

Digital technology and microcontrollers

Image	Description	Year
	10MHz GPS frequency standard GPSDO with isolated distribution amplifier and OLED display, based on a TruePosition circuit board	2024
	OCXO Timebase New time base module for Philips frequency counters using a quartz oven	2023
	TAE Connect Ring detector for analog telephone lines	2019
	Blitzortung Setting up my station for the blitzortung.org measuring network	2016
	N64 Analog Replacement Stick A new analog stick for better retro gaming	2015
	Borsti The remote-controlled bristle robot of the AATiS e.V. (AS104)	2014
	Doorbell extension Module for connecting wireless doorbells to an existing system	2011
	Talking alarm clock 2 Second version of the talking alarm clock featuring an IV-18 VFD tube	2010
	1U rackmount clock Clock module with dimmable output for a 12V rack light	2009
	TV-B-Gone A remote control that turns off any TV	2008
	Talking alarm clock 1 First version of the talking alarm clock with a vacuum fluorescence display	2006
	Akkumatik (Kit) Battery charge, discharge and diagnostic system	2011
	RFIDtect Detects RFID readers and analyzes the carrier frequency	2008
	Battery capacity meter Measures the capacity of 12V batteries	2006
	DS1615 Standalone temperature data logger with DS1615	2005
	Fox Oring transmitter control ARDF transmitter controller using microcontroller and real time clock	2004
	Fader start/stop Upgrade Kit for Home CD Player	2004

PC Hardware

Image	Description	Year
	LoRa Rain Gauge Rain gauge upgraded to LoRaWAN radio technology	2024
	RasPi Fan Fan controller that plugs onto the GPIO header of a Raspberry Pi single-board computer	2023
	IoT Geiger Counter Geiger-Müller Counter with WLAN / LoRaWAN connection	2021
	ESP8266 / ESP32 Pixel Controller WiFi Pixel Controller for WS2812 LED strips and fairy lights based on WLED firmware	2020
	ESP8266 MiLight Hub Smart home gateway for MiLight bulbs	2019
	WiFi Weather Sensor Your own weather station for the Internet of Things	2017
	Lithium Power Pack DIY mobile battery pack	2011
	USB Funk Managing 433MHz radio-controlled sockets with the PC	2010
	SP USB LCD USB LCD prototype with EA-DOG for a firewall appliance	2009
	USB LCD HD44780 on USB port with Linux using lcdproc	2008
	GPS MS1E GPS receiver with uBlox GPS-MS1E	2006
	Lightcontrol 8 channel relay interface for party lighting	2004
	TFT2PC Using LVDS and TTL TFT displays as PC monitors	2003
	VFD Controlling vacuum fluorescence displays with your PC	2002

Analog technology, power supply and chargers

Image	Description	Year
	Solar MPPT charge controller with CN3722 Charge controller for LiIon or LiFePO4 batteries with maximum power point tracking and temperature monitoring	2023
	Soldering fume extraction Clean air during soldering thanks to the activated carbon filter	2023
	3V Boost Converter with MCP1640 Efficient boost switching regulator for battery operation	2020
	LiFePO4 USB charger USB Single Cell Charger for Lithium Iron Phosphate Batteries with MCP73123	2013
	TEA1102 Charge controller for NiMH/NiCd cells	2003
	Inverter 12V to 230V 50Hz sine wave inverter (100W)	2005
	TDA2030 14W HiFi Audio Power Amplifier	2003
	BA5406 2x6W audio amplifier	2002
	Sheath current filter Experimental sheath current filter for audio lines	2005

Sound and light technology

Image	Description	Year
	uDMX USB DMX Interface	2011
	Dual Flower Upgrade of a double flower effect to DMX	2009
	QScanDMX Upgrade of a roller scanner effect to DMX	2009