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power supply from battery and car outlet

I am working on a GPS data logger working on 3.3V I'm pretty much done with all the digital design but one thing is still missing and I'm not familiar enough with analog electronics to do it. I would like the device to be able to get power supply from both 3-4 AA batteries and from a car outlet supply. when the car supply is connected, the batteries are not wasted, and when its not, the batteries automatically switch in. does anyone have a schematic of a circuit that does this for me to follow? or can anyone explain how to do it? thank. Shy

Reply to
shooshx
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If you use a pair of current steering diodes, the one with the higher voltage will power your unit. In other words, the diode from the battery will be reverse biased, and will turn off the current flow from the battery. It will also prevent the battery being damaged by a reverse current.

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Michael A. Terrell
Central Florida
Reply to
Michael A. Terrell

You get a regulated adapter like a RS one, that provides, say,

6V from the car jack.
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(mind word wrap) Then get a connector like, for example, one of figure 17 - 31 here:
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These are called, I think, "shorting jacke", but someone will correct me if I'm in error on that. The battery goes to the NC contact, and the movable contact goes to the circuit. The center conductor is common to both.

Have Fun!

Reply to
Rich Grise

yes exactly shooshx u can use diode as switches to make ur work more reliable

Reply to
majid85

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