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.

 

You'll get more feedback if you post an image that everyone can see.

 

My schematic is not showing up?

 

It's in .sch format.

I, for one, don't have that program installed on my computer.

 

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

 

Ahhhhh, thanks guys. I didn't know it came out so small. I'll make it bigger and post it. Does this work?

Thank you all.