555 Timer Control Voltage pin and it's effects on cap charge

Thread Starter

JingleJoe

Joined Jul 23, 2011
186
Tonight I've been researching quite a bit but have come up with no answer to my question:
What happens to the voltage accross the capacitor in a 555 timer astable circuit when a voltage is applied to pin 5?

My conclusion was that the cap would charge to a higher or lower voltage than it ordinarily would.

But I want to know more detail! I'll do some experiments of my own if I have to but you haven't seen my workbench, I want to clear it up before I start building more things.

How does the voltage applied to the control voltage pin affect the capacitor charge? graphs would help :) I love graphs.


Additionally I feel I should mention that I know the cap ordinarily exhibits an almost triangular wave between 1/3 and 2/3 supply voltage (I also think of this as p-p = 1/3Vs, biased to half Vs)
 
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