shenry
Member
Hi
I'm in the midst of designing a circuit and I have a relay setup to switch from a 9Volt battery to a 9volt wall wart when the wall wart is plugged in to save drain on the battery. Not just wire them in parallel and put load on both.
My question is if I have the positive terminal of the wall wart leading to the negative terminal of the battery will this discharge the battery whilst it's connected to the negative of the wall wart as well? Or will I have to setup so that the negative of the battery is disconnected as well when the wall wart is plugged in?
Sorry if this is in the wrong section.
Thanks in advanced.
EDIT: After conducting an experiment with a power supply, battery and meter I've found the no current flows between two different sources(Or at most very little). EG the power supply will only flow to the power supply and the battery will only flow to the battery.
I'm in the midst of designing a circuit and I have a relay setup to switch from a 9Volt battery to a 9volt wall wart when the wall wart is plugged in to save drain on the battery. Not just wire them in parallel and put load on both.
My question is if I have the positive terminal of the wall wart leading to the negative terminal of the battery will this discharge the battery whilst it's connected to the negative of the wall wart as well? Or will I have to setup so that the negative of the battery is disconnected as well when the wall wart is plugged in?
Sorry if this is in the wrong section.
Thanks in advanced.
EDIT: After conducting an experiment with a power supply, battery and meter I've found the no current flows between two different sources(Or at most very little). EG the power supply will only flow to the power supply and the battery will only flow to the battery.
Last edited: