This circuit was found in a Philips documentation from 1970. The components are of the time, difficult to find today, but the configuration can be adapted to use modern equivalent components.
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This circuit was obtained from a Linear Technology manual from the 90's. The integrated circuits are...
This circuit has its battery charged by a solar system. The circuit uses components that admit...