This circuit uses sunrise and sunset as a synchronization signal. The circuit is from Electronics Now magazine from May 1999. The cycle is one pulse per week.
This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of...
A bridge with greater sensitivity and, therefore, lower consumption for the microcontroller...
Found in a 1964 magazine, this is a small headphone amplifier from 500 ohms to 10 k ohms (magnetic...