Would it not already be connected if it's using the same battery? The ground from the battery feeds both the EZ-B and the converter, the converter then feeds the sensor with the same ground... Please correct me if I am wrong on that though.

1. The grounds are shared (Conencted) in TechnoPro's drawing

2. I would recommend using the LM1084 instead of a 7085. The LM1084 has less drop-out voltage, more amperage and therefore generates less heat.

Thanks for the heads up DJ.... I was going to grab a bunch more of the 7805s from eBay... However, I think i will take your advice and get the LM1084s instead....

Cheers Richard

Am I missing something here. Why would you not just run the board off of 5-7 volts and then you wouldn't need anything else. Why do you need 12volts to the board? Just curious.

Herr Ball, I think that's what the original poster opted to do, no other reason. Some folks are probably making bigger bots (me included) that are just easier to use a 12volt sla type battery. Also maybe the original poster is using wheelchair motors or some other type of device that needs 12vdc.

I'm using 12v 2amp motors. And the ez-b v4 from what I recall can't go under 7volts so a regulator for each assecory or a power supply regulated.

Dimension has some nice inexpensive converters. I've been really pleased with the build quality of their stuff. I guess with the v4 I'll have the same issue since I'm using two 12v sla's and big chair motors. I guess this would be a solution too?

5v switching voltage regulator

Niek brings up a good point. Some switching converters are isolated between the input and output. If you have a converter that is ground isolated, there would be no reference for the signals on the sensor going back to the EZB even though the input to the converter shares the same ground as the battery and EZB. His solution to that situation would be valid. Good thinking @Niek!