Hi, I've built this charger (with LM312). I've also got one 6v-7Ah battery. The idea is to use the above as an arduino UPS. I will not use arduino's built in regulator. Instead I'll use a 5V LDO regulator and connect it's output to arduino's vin.
I would like to use an LTC4412 in order to feed from the power supply when power is present or from the battery when it's not. Browsing the application notes of LTC4412 http://cds.linear.com/docs/en/datasheet/4412fb.pdf I think that I need to implement the circuit of Figure 3 @ page 10.
My understanding is that MY "WALL ADAPTER INPUT" should be connected to the unregulated input of LM312 of the charger circuit.
Do I get it right?
As an alternative would it be feasible to just connect the input of the LDO to the battery's pole and not use the LTC4412?
Thanks in advance!