JamesNorth writes:
This post is about an R2R Ladder DAC that I build one evening. I wanted to play around with the Arduino Mega 2560 board I have and this seemed like a perfect way to try it out. Below is the schematic for the DAC…
This is an 8-bit DAC built-up from just resistors, each bit is connected to a GPIO pin of the Arduino. I built the circuit on a breadboard and connected it to the Arduino using jumpers.
to reduce the pincount, use a 74xx148 8 to 3 line encoder. Put the ladder on the 8 input pins for the chip, and strobe the binary 3 bit output.