Flight attendant. Flight attendants or cabin crew (also known as stewards/stewardesses, air hosts/hostesses, cabin attendants) are members of an aircrew employed by airlines primarily to ensure the safety and comfort of passengers aboard commercial flights, on select business jet aircraft, and on some military aircraft.
Half adder circuit. To understand what is a half adder you need to know what is an adder first. Adder circuit is a combinational digital circuit that is used for adding two numbers. A typical adder circuit produces a sum bit (denoted by S) and a carry bit (denoted by C) as the output.
How to Build an LED flasher circuit. In this project, we will show how to build a simple LED flasher circuit using a 555 timer chip. An LED flasher circuit is a circuit which flashes the LED-meaning turns it ON-OFF, ON-OFF, ON-OFF.e can slightly modify the circuit above so that it flashes 2 LEDs. The LEDs will flash alternatively. As one flashes on, the other flashes off. This happens pretty quickly but it still can be seen with the human eye. Additional Parts. 1  1Kâ¦ Resistor. 2  Red LED.