This is the latest version of Christian Aschoff's popular Nachbau LED driver board.

 

With the version 3 of the NachBau, the coin cell battery (CR2032) was replaces by a super capacitor, so the actual time can be kept over ca. 2 weeks without external power supply of the board. And sure, the great advantage of a super capacitor over the battery is that you don't have to change it every couple of years for maintenece.

 

Besides that, a few minor improvements where made: the red power led indicates power from external power supply AND ftdi and a resistor was changed from 10k to 4.7k.

This Nachbau(“replica” in German) is an LED matrix display driver capable of driving up to 16x16 LED matrix display(i.e. 256 LEDs). It has a Super capacitor backed Real Time Clock module populated on the board for convenient time updating. The printed circuit board is compatible (not included) with a TTC module is based on DCF77 time signal from German National Physics Lab in Braunschweig. One more, this is a chainable board so you can get larger display by chaining some up.