![]() ![]() The above condition ensures a zero or logic low at the output pin#6 of the IC. The circuit functioning of the proposed cell phone/tablet low battery indicator with cut off can be understood as follows:Īssuming the connected battery pack to be fully charged, the potential at pin#2 is allowed to be at a higher level than at pin#3 by setting the 10k preset appropriately. I don't want to buy of the shelf products. I just hate it, when a circuit like this is used in a 1$ devices. I'm looking at 0.5-1.5A on the primary side (batteries) and 1-2.5A on the secondary 5V side.įor charging both the phone and the tablet. I'd like this to use this with no relays (as they use too much power). ![]() The setup of simply using a transistor and a variable resistor in conjunction with a TIP122 transistor for handling larger currents, resulted in draining the battery further than the absolute minimum of 7.2V. I'm using these with a (car) 12V to 5V USB charger, which I'd like to use on the go. I have a 8-pack of AA (NiMH LSD) batteries, which should never discharge below 7.2V. I'd like a circuit/ic for purely low voltage cut off. I know it was asked before, but still, if you can help me out, I'd really appreciate it. The post explains a simple yet effective low battery cut-off with indicator circuit which can be integrated with cell phone/tablet charger battery packs in order to monitor and avoid battery draining below a set threshold.
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