transistor tester

figured out I need one, to test high-voltage transistors from CFLs, that I want to use for radiation counter. For the PNP I use dc/dc converter PCB, for the NPN I simply rebuilt the circuit with reversed polarity. interestingly the NPN version actually has common ground, the PNP version does not. Also I figured out how to build it without … Continue reading

16f1824 scrolling message

I have now built various prototypes using the 16f1824 to scroll a text message. The code is written in RISC assembly, about 1k memory size. It is available for unlimited personal usage, only 5 dollars. The display width can be changed! Most of the internal RAM is used to buffer the scroll data. So the message length is quite limited … Continue reading