/diy/ - Do It Yourself

Circuitry Questions Space Race !spYLAesZNE Thu Jan 31 13:28:17 2013 No.386726 [View]
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So I've got a little project I'm working on but I was having a little bit of a tough time understanding how to get a square wave from my 555 timer that has an equal time for high and low voltages.

Looking at the formula it gives you on the datasheet, would I want to put it in astable mode. So the formula for high would be .693(RA + RB)C and for low .693(RB)C. So, if I just leave out the RA shouldn't the two times be equal or would I encounter problems by doing that?

Here's the PDF: http://www.ti.com/lit/ds/symlink/lm555.pdf

I figure I'll use this thread as a general questions one as I expect to have more as I work on this further. (I'm really rusty with circuit analysis)

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