Need help adding an additional timing function

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paggss

Joined Dec 16, 2012
3
I'm trying to add another 555 timer to this circuit board (including another potentiometer) to time another time period. For instance, I want the first system to time a 10 second to 2 minute timer period and the second to do the same. I want to use the same power source, the same Piezzo Buzzer and an 0FF/ON/OFF toggle switch to activate either circuit. Has anyone done this before? I couldn't find anything similar in the forums.
 

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KMoffett

Joined Dec 19, 2007
2,821
You're using ExpressPCB. To post a viewable schematic you can go to File > Export schematic image > 300DPI. This produces a large .BMP file. Too big to post here. I prefer .GIF, so open, crop, and export to a .GIF in MS Office Picture Manager. You could use Paint too.

Ken
 

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