This circuit is from an American manual from 1975. The transistors are types of the time, but equivalents can be used, as well as the relay that can be according to the supply voltage.
This old circuit uses an operational one from the 70s, but it is still useful in current projects. The...
This simple aperiodic signal amplifier is powered by the batteries or source of the receiver with...
This circuit, which has a strong didactic appeal, simulates logical functions, and can be used in...