This digital to analog converter circuit was found in the March 1980 Radio Electronics magazine. The power supply should be symmetrical, and the digital controls can be TTL.
The integrated 4017, a C-MOS counter, is one of the most popular in the design of sequences,...
This simple very low power circuit can be used in a battery powered infrared tone trigger. We...
This timer controls two relays, each with a different timing, activated separately. The circuit is from...