I recently bought a new tuner that is about 30 years old: a Carver TX-11a made in 1988. While it sounds amazing, it’s a little annoying that there is no way to control it from my sofa. So I’m looking into building a little remote control for it, and I’m collecting some research on how ...
I’ve been getting interested in playing with the attiny, in particular the attiny85 (8 pins!) and the slightly more practical attin84 (14 pins). So I built a very simple programmer that can program either of these and be easy to use while programming.
Maybe music is overstating this a bit, but it’s creating sound (and makes for a second alliteration in the title). Measuring a constant voltage is one thing, but can the discrete DAC put out a waveform? After all, that’s the main idea behind using a digital-to-analog converter (DAC) rather than pulse-width-modulation (PWM).
Arduinos have analog outputs, but they generate a pulse-width modulation (PWM) signal rather than a voltage. There are a number of circuits to create a voltage from a bit representation. One of the simplest and most elegant is the R/2R network, which only needs two resistors per bit.