Quote Originally Posted by Security View Post
I am using the attached adapter. It should empower a circuitry with 4A for one hour (4Ah).
As a reference I have a 9V block battery, rechargeable, 200 mAh.
Using the 9V bb it works well for a very limited period of time due to it's low capacity. Using the adapter it seems as if not enough current can be delivered, as if there was a bottleneck.
So the pic does not start it's program using the adapter and a led(+5V -> led -> resistor -> ground) is flashing and shows a very dimmed light. This led is on like normal using a PSU or the 9V block.
What is wrong with the adapter, how to fix it?
6 AA NiMN (or NiCad's) do NOT make a solid 9v...Only does about 1.2v per cell, 7.2v nominal...without a load.
Put a load on it, and it'll drop a bit more.
Try to run that low-ish voltage thru a 7805 type regulator and you'll be running up against the minimum voltage needed for a 7805 type regulator to regulate properly.

In other words, add 2 more cells and you should be ok.