temperature displays

alright, so using my existing 7805 circuit, is this correct?? Also, adding this stuff to the existing 7805 circuit won't affect the connectors I have there to power the displays will it?

forgot the freakin image

All looks well.  The extra load on the 7805 will be minimal.  J1 and J2 are to power the displays? 

yeah, they are just connectors, I'm going to have to add two more to power the amp and volt meters, but Im waiting for my VB1212S-1W Isolators to arrive. If only I had the stuff to make a PCB, that would rock. I'll get the stuff to build this on wed or thurs and get it together.

I picked up the parts but I have the transistor on order as well as the 100 ohm pot. a trim pot will work right? I just have to find a perf board now, and get some connectors. is there anywhere I can have a single PCB designed for this circuit? I don't want to have to buy a massive quantity of PCBs just so it can be made. I don't have thesupplies or knowledge to design PCBs.

The circuit is really small enough to assemble on a project board.  This one would be way more than enough area to do what you need.  .radioshack.com/ 2102845Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

I was actually looking at that. In the past I've used perf boards with single holes. I can see how that might be easier, but isn't it hard to place components on a board that has a "pattern" like that? What would be the best way to connect the components, wires? again, with the single hole boards, I've usually just bent the leads to connect with each other. I haven't built anything big before, so that's always worked out ok, but I would like to know how others who assemble circuits go about the connections/pathways.

The 2 strips in the center of the board are used as power and ground.  Straddle the Chip over those strips.   The chip will insert into the holes directly outside of the strips, this will leave you 2 available connections for each pin on the chip.   If you have an old IDE ribbon cable for a computer hard drive laying around, a strand of that will make a great jumper wire.  The ribbon cable will work great for your project.  If you were doing something that requres more current, you will need larger wire.Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

thanks for the advice guys, ribbon cable is perfect, and I'm gonna def. check out the program/site. it's the layout for troubleshooting that gets me lol, I've only made simple circuits before, not that this is complicated but there are going to be more connections than I'm used to....sometimes gets a little confusing following a diagram. I also got my isolators today, turns out they are 12v (I don't know why this just clicked in now tbh, I must be stupid or something) so I'm going to have to put them on the 12v side and step the voltage down AFTER the isolators, which means actually building another 12 v - 5v regulator circuit. I may just reclaim my existing one and use it for this. The other isolator will be for my voltage meter, and will isolate the voltage being measured. that way it will all work to the specs of the meters. It says they can't measure the same source either, which means I would need another isolator(vb1212s-2w, dual output) but the diagrams provided by the company show both meters measuring the same source when isolated with the dc-dc isolators. I'll get some scans in a bit.