The first six circuits to learn the theory and digital logic behind twelve simple experiments that can be performed using IC 555 were published in December 2022 issue. Here are the remaining six circuits.
Although the circuits are non-conventional, they help understand the IC 555 comprising voltage divider, trigger comparator, threshold comparator, SR flip-flop, discharge transistor, reset transistor, and output stage. They also help understand the IC’s three modes of operation: monostable, astable, and bistable. The visible operation of the IC in all the twelve experiments is shown by LEDs.
All the experiments are simple and can be performed on a breadboard. A power supply of 5V to 9V DC can be used for the circuits (although according to data sheet of IC 555, 4.5V to 15V may be used). In the following circuits two 555 ICs are used to create interesting situations and make the learning an enjoyable experience.
This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s January 2023 Issue–print or ezine edition.