Ferdinand Keil's

electronic notes

Feb 28, 2013

Reparatur eines elektronischen Halogen-Trafos

Dieser elektronische Trafo (Modell EST 105/12.381 von Vossloh-Schwabe) zeigte seit kurzem ein merkwürdiges Verhalten: nach dem Einschalten leuchtete die Lampe eine Zeit lang ganz normal, begann dann zu flackern und erlosch schließlich. War die Lampe ein paar Minuten ausgeschaltet leuchtete sie wieder und das Spiel begann von vorne …

Jan 22, 2013

Use the TP-LINK TL-WR703N as a WiFi client with OpenWrt

I recently bought a TP-Link TL-WR703N router on eBay to connect one of my projects to the net. The router arrived today, just 18 days after I ordered it from China. I need it to operate as a client in my wireless network, so after I successfully installed OpenWrt I …

Nov 03, 2012

Simple Task Scheduler for Microcontrollers

For a project I'm currently working on I need to write a (at least for me) fairly complex firmware. The code I used in the last version of this circuit grew out of a test program and became unmaintainable. So I looked around for some inspiration and found Alan Burlison's …