555 timer problem
February 18, 2009
Can anyone lend advice on this? I am needing a circuit that takes an input of 12 - 15VDC and gives an out put that switches between 0V/.7V to 0V/.9V at about 3.3 sec intervals. I don't know enough to design it, so I found the attached diagram. I can't get it to work. D1 LED should come on solid with power and D2 should blink at the high output pulses (about every 3.3 sec). Can anyone take a look and see if maybe the schematic is wrong? I can't even get the 1st LED to power....I have built it twice and quadruple checked solder points and paths...pulling out my hair!
Thanks in advance for any help!