can I connect power like this with no problems?

[strokedmaro]

Ive attached a pic of a circuit board I just made and had an idea. I could apply this to several projects but 1 or 2 already have a 5vdc voltage regulator incorperated.

My question is that this board was designed to use 12vdc (yellow attempt of a square on the pic )into the 7805 to provide 5vdc out. I added a few spare 5vdc connections (blue arrow). Could I simply supply 5vdc directly to (blue arrow) the board if I attach it to a project that already has 5vdc coming out?.....that would eliminate an additional Vdc hookup. OOoOOR is it possible to have a 7805 on one project power the 7805 on this project? That would be the easiest way and I don't see why it wouldn't work but you guys are the experts.

Thanks!

 

[bananasiong]

Hi,
You can do this, provided that the current drawn by both the circuits is not too much for the 7805. Also, besides the +ve, you need the common ground as well.

 

[strokedmaro]

Thanks alot...I didnt see a reason for it not to work but its always good having second opinions Thanks again

 

[AllVol]

Thanks alot...I didnt see a reason for it not to work but its always good having second opinions Thanks again

You're just powering two devices in parallel circuit when you do it this way. I have a progress report thread over on the microprocessor board that shows four circuits all powered from one power supply.

 

[Hero999]

What's the maximum current required?

It'll be fine without a heatsink, providing the current is below about 100mA.