Fahrrad-Tachometer (Analog Reed Kontakte)

This circuit can be used to generate an up-down staircase waveform with a total of 512 steps per cycle. ICl and IC2 are two four-bit up-down counters connected as an 8-bit counter, with an R-2R D-A ladder network connected to the outputs to convert the binary output codes to a staircase waveform