NE555 timer 555 is often referred to as the basic purpose of this chip is to form rectangular pulses of varying frequency and duty cycle. In addition, it is also called a programmable timer, as with parameters of external resistors and capacitors can set the response time of the chip. In this video are considered the principle of the timer 555 and its main characteristics. Also clearly shows the most common schemes to NE555. We investigated two modes of operation timer: self-oscillating mode and one-shot mode. The end result of this video has assembled on the breadboard siren alarm.
IC NE555 gained attention not only to radio amateurs, but also professionals. It is on the market for more than 40 years, and this time is more than enough to confirm its usefulness, as one of the elements of the various electronic devices. In addition, at a low cost NE555 opte is $ 0.05 per piece.
NE555 chip: ali.pub/0bd6u
NE555 pulse generator : ali.pub/misgd
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