This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to obtain different controls for power loads.
This circuit visually indicates that a high voltage is present in an outlet or other point. The...
This circuit is from a 1967 publication. It is possible to power a fluorescent lamp from a 12 V...
The 4046 consists in a PLL with na internal oscillator controlled by voltage (VCO). Figure bellow...