I currently made a few identical circuits and they all successfully work on a 6VDC 900mA DC unregulated adapter. I use internal regulation via LM2940 IC since the rest of the parts use 5V. The easy way out is to buy a power adapter for each board, but I was wondering on the easiest way to condense the number of power adapters to 1 for all the boards.
If each board consumed 900mA (as worst case) and I wanted to daisy-chain say 5 boards instead of 2, then would I need an adapter capable of delivering 7 to 35V (or whatever the maximum LM2940 can handle with no heatsink without overheating), and would that adapter need to be able to supply 4.5A output? or did I get my math wrong?
For reference, I added a picture below to help you understand the setup I have (left) and the setup I'm trying to achieve (right).
If each board consumed 900mA (as worst case) and I wanted to daisy-chain say 5 boards instead of 2, then would I need an adapter capable of delivering 7 to 35V (or whatever the maximum LM2940 can handle with no heatsink without overheating), and would that adapter need to be able to supply 4.5A output? or did I get my math wrong?
For reference, I added a picture below to help you understand the setup I have (left) and the setup I'm trying to achieve (right).