/diy/ - Do It Yourself

Currently working on my little variable speed sign project. Progressing little by little.

Still unsure about what I should use for switching the LED segments.
Currently thinking to use 10x 2N3904 transistors for each string and parallel interface between the LED board and the controller board. Serial interface would require dual 8-bit shift registers and the board might be a bit too small for those. Also then the LED board would need to have a 5 V supply for the register ICs.

The controller device will be located on a separate board. I want to use 4000-series discrete logic ICs for controlling the display. But if it doesn't work out I can also implement the logic with an AVR IC.