This circuit, obtained from old documentation, doubles the frequency of the pulses applied to the input. The circuit must be powered by a voltage of 5 V.
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
This watch was found in 2001 documentation. The watch is powered by 4 batteries. To save energy, the...
This circuit not only indicates when the battery is on but also when it is low. The circuit is...