Tag Archives: 555

555 Timer

555 Timer

astable 555 circuit

This is a 555 IC in the Astable configuration it will give off a square-wave form with a frequency f) The capacitor (C) is charged through resistor (R1+R2) and discharges through R2 only.

( C is in Farads & R are in ohms )





Try this:

To build a astable 555 with +/- 1Hz period and 50% Duty cycle you will need:

555 IC,  R1-10k,  R2-150k,  C-4.7uF,  C1-10nF (103)

All this can be bought at Maplin Electronics