VU Meter with LM3915 and LM3916 Question

Greetings!

This is my first post in this forum. I am attempting to build the circuit from this post: "Volume Unit Measurement with LM3915 and LM3916()":http://www.eeweb.com/blog/circuit_projects/volume-unit-measurement-with-lm3915-and-lm3916

I can only assume that I have incorrectly put the circuit together, as the only thing that happens when I power it up is pin 10 (LED 10) is the only LED to light up, and nothing else happens. I'm stuck with this one. I've gone over the breadboard and schematic quite a few times, but I just can't seem to find the issue.

I've included a picture of the board just in case.

Any help and/or pointers would be great! Thank you!

I don't see anything connected to the input. Have you tried it with a signal on the input?
I see a two pin header and it looks like that is for +12 and -12, but are you also connecting a ground to the power source (i.e. a connection from the power source ground to "0V" on the circuit)?
Check all your power connections with a volt meter.

Do you have an oscilloscope? If so, connect a signal to the input and check to see if it's at pin 1 of IC1 and pin 5 of IC2.

Other than that, it difficult to fully check your connections from that photo. It's at a bad angle for some of the connections -- especially around the OpAmps.

I say the headers pins I am presume is for the +12 and -12. Where are you connecting the ground from the power supply?

Thank you for the quick reply. I did have the input signal connected, but removed it just before I took the picture. One thing I wasn't terribly certain on was how I should hook up the +12 and -12. I've only built circuits with a positive and ground. Now that that was brought up, I can imagine that is this issue.

I do have an oscilloscope, so I will check that when I get home.

I will also take some top view pictures.

Thanks!

Judging from the first reply, I think I have hooked it up incorrectly. Those two header pins were for +12 and ground. I'm not for sure how to hook it up for -12V.

Also, the input positive was connected to the positive side of C2.

Well, without -12V it won't work, so be sure to add that. Sounds like you are experiencing some of the same sort of "mindfreak" I used to back when I was getting started. -12 is no different than +12, it's just another supply line. Hook it up the same way you did with +12 -- only there is no busbar for it, so just connect it directly to IC1 pin 4, and then connect C4 from IC1 pin4 to Ground (0V).

And did you connect the grounds together? You need to do that, too. In other words, connect the ground or "negative side" of your signal source to the ground ('0V') of VU circuit.

Yes, the grounds are connected together. I've taken another look at the circuit, and rearranged some of the components to where they should be after you advised me on the + and - issue. I am still only getting LED 10 to light up, however, after I remove +12V from the op-amp, it scrolls through the LED's connected to the LM3916 almost instantly, then slowly scrolls through the LED's connected to the LM3915. When I connect +12V back to the op-amp, the scrolling ceases and LED 10 just stays lit. Now, this I neglected to say when I first posted that I didn't have a TL072, so I used a JRC4558D, LM741, and TL061, but all had the same outcome. I do have some TL072's on order, and should be here Monday.

I've attached a better picture of the breadboard. If you need any other angles, or closeups, please let me know.

Thanks again!