battery isolation ?

Thread Starter

jrm

Joined Oct 11, 2011
38
I need to add an Auxilliary power input jack to an existing project that is normally supplied by Li ion batteries. I would like to isolate the batteries from the circuit when external power is supplied. My initial thought is to just use a pair of n channels like this:http://www.falstad.com/circuit/#$+1...256+208+416+208+0+1+true w+864+496+864+320+0

(I put a lamp in the simulation in place of the board regulator)

Is there a better way? maybe a single chip solution? I'm not opposed to making a charging circuit either.
 

Thread Starter

jrm

Joined Oct 11, 2011
38
Does anyone see anything wrong with this circuit to isolate the Lithiums when the 12v dc adapter is plugged in?

I feel pretty confident that it will work but since the risk of failure here would include damaging an existing project, I am seeking feedback from those more experienced than myself.
 

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