A timer-controlled doorbell device has been developed using two 555 timer ICs in monostable mode, combined with a relay ...

This paper deals with an expert system which can estimate possible fault sections using information from protective relays and circuit breakers. This system is applicable to dispatching centers and ...

The most compelling and simplest chaotic circuits have always been technical challenges. Here we report an inductor-less 555 timer chaotic circuit, combined with two resistors and two capacitors, ...

An old school digital clock made using transistor-transistor logic chips: counters, logic gates, flip-flops and other integrated circuits.