Found in old American documentation, this receiver transmits signals via the power grid. We can use it on links or remote control. The components admit equivalents.
The inverter circuit shown in the figure can be used to power a fluorescent lamp in an emergency...
This circuit was found in 80's Popular Electronics. The circuit uses an infrared-sensitive phototransistor...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...