What is the purpose resistors and capacitor in this 555 circuit

Posted on Feb 5, 2014

It`s a typical AMV (Astable MultiVibrator) setup. The capacitor gets charged through both resistors until 2/3 Vcc is reached (internal comparator level). This sets a flip-flop which activates the Discharge output (DIS). Through DIS and the potentiometer, the capacitor is discharged until the voltage on the Trigger input (TRI) is 1/3 Vcc, which resets the flip-flop

What is the purpose resistors and capacitor in this 555 circuit
Click here to download the full size of the above Circuit.

and switches off DIS, so that a new charging cycle starts. So the capacitor voltage swings between 1/3 Vcc and 2/3 Vcc, and each time one of the limits is reached the output toggles. It`s worth it to study the 555 block diagram and its typical applications, like this AMV or the MMV (Monostable MultiVibrator). The 555 is one of the most versatile ICs around.

Leave Comment

characters left:

New Circuits



Popular Circuits

6.5Mhz Vfo Circuit
Logic Probe With Sound
Door lock Motor
By single-phase active power factor correction (APFC) Make up three-phase APF
ultrasonic receiver circuit
h bridge How can I implement regenerative braking of a DC motor
Solid State Switch for magnet DC Generator
Laser Activated Switch
4x3 4x4 Matrix Keypad Interface with Atmel AVR Microcontrollers
dvi to par digital video interface with lcd
A Dozen Small Cmos Alarm Circuits