This circuit is from a National Semiconductor manual from the 1980s. The integrated circuit is rare today and next to the diagram we have the formula for calculating the components.
We find this circuit in an American 1980s documentation. It triggers an alarm in the event of a...
This medium wave radio works with any general purpose NPN transistor. The diode must be made of...
Found in an 80's documentation this circuit uses an integrated from the uncommon era today. Other...