Fixed frequency Variable duty cycle with 555

Date:2012-8-24Author:

This circuit is based on a very old application note from exar, in this the frequency is fixed by IC1 and IC2 -P1 controls the duty cycle. you need to compute the R and C values to get what you need, LM555 data sheet.

You have to study the circuit and do something more innovative perhaps, just copying is ok for learning but it will get you nowhere, so learn and then innovate, the eagle circuit is given below so you can learn by editing it, also design a PCB with it, and you can even make a PCB at home to learn, but it is always good to get PCBs done by a PCB vendor, but you should understand his problems, then you will design well, so make a few PCBs.

Fixed frequency Variable duty cycle with 555

See Larger Circuit. 555 Variable Duty Cycle Oscillator

Edit the circuit eagle cad file del00012.zip, eagle cad has a free version for windows and linux.

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