General question. I have an astable multivibrator made from a 555, that pulses once every n seconds (2-3). I wasn't this to trigger a monostable 555 circuit. Where do I connect the interconnection?

OR, what equation applies when calculating the duty cycle for an astable 555 circuit? Or what link tells me For example, I want the 555 to output a high signal 20% of the time and low 80% of the time.

 

connect pin 3 of the Astable to pin 2 of the monostable,via a capacitor and resistor integrator.

 

General question. I have an astable multivibrator made from a 555, that pulses once every n seconds (2-3). I wasn't this to trigger a monostable 555 circuit. Where do I connect the interconnection?

OR, what equation applies when calculating the duty cycle for an astable 555 circuit? Or what link tells me For example, I want the 555 to output a high signal 20% of the time and low 80% of the time.

High time for a monostable = 1.1 x (RC)

You will have to calculate the duty cycle off-line based on the period of the astable and the high time of the monostable because a monostable is only a high time, not low.

 

I want the 555 to output a high signal 20% of the time and low 80% of the time.

Cap charges through Ra+Rb and discharges through Rb. Adjust the ratio of Ra and Rb to get the high/low combination you want.

 

Thanks everyon. I think beween the three answers, I have what I need. If I'm wrong, I'll be Bach...