ABSTRACT
Delay The circuit below has a potential divider R2/R3 which has an output voltage 4.8 V. The operational amplifier (see Chapter 11) compares this voltage with the voltage across C1.
The circuit is triggered by pressing S1 to discharge the capacitor fully. This brings the non-inverting input (+) of the op amp down to 0 V. The output of the op amp swings down to 0 V and the LED goes out.
