This telecommunications circuit was found in a National Semiconductor publication from the 90s. It is intended to convert the voltage from 48 V of telephone lines to 5 V with currents up to 1 A.
Found in an American publication of 1968, this circuit makes use of a pilot light of the time. It...
This circuit was found in documentation from the 1980s requiring a variable power supply from 0 to...
This car alarm was found in an American '80s documentation. The circuit automatically activates...