When the voltage in the circuit exceeds the value set in the trimpot, the LED goes off and, if a low current buzzer is used, it rings. The circuit is from American documentation from 1999.
This circuit allows you to use a calculator as a timer by directly activating a sum key with...
This “Half adder” circuit uses NAND gates from a 7400. The power supply must be 5 V. ...
ECL logic circuits can operate at very high frequencies. This circuit was obtained from a 1977...