555 Timer Schematic. Its name is derived from three 5k ohm resistors connected in series used in it the timer ic can produce required waveform accurately. 555 timer was first introduced by signetics corporation in 1971 as se555 ne555.
The lm555 timer is a direct replacement for se555 and ne555. The 555 timer is a simple integrated circuit that can be used to make many different electronic circuits. By wiring the 555 timer with resistors and capacitors in various ways you can get it to operate in three different modes.
The 555 timer ic is an integral part of electronics projects.
Its name is derived from three 5k ohm resistors connected in series used in it the timer ic can produce required waveform accurately. As we have seen previously the 555 timer comes as a single device within an 8 pin dual in line package dip or as the 556 device which has two 555 chips in a single 14 pin dual in line package. To connect power to the 555 timer chip we connect about 5 15v to v cc pin 8 and we connect pin 1 to ground. 7 3 2 timing from microseconds through hours.
