**** Photocopy of Article from Autumn 2000 Electronics Education p34 - 40

Extracts for Use
The 555 Astable Oscillator

The following extracts have come from Electronics Education Autumn 2000. These may be downloaded by OSFC students through the College Intranet and used as evidence and support in the design calculations required during the AL Electronics project.

Two diodes added to the basic 555 astable multivibrator give wider control over the duty cycle.