Hi,
I am building a board where the power input can come from a battery or an adapter. So, I used a 3-polled DC jack and draw this schematic:
Thank you, JJ
Switch the + terminal, not the ground. Place an isolation diode in series with each power source so they can't feed into each other.
Don't put power on the ring (outside) terminal as you stand a greater chance of shorting the battery.
Lastly, use a co-axial power jack.
Good luck!
Thanks Lord Garth,
Really? Most electronic devices ( e.g. Spartan3 - starter kit
"Work" what do you mean? No leakage between Bat_Gnd and Gnd will be a challenge on sample board and may shorten the battery during insertion-removal of plug. But used in many instances of "el cheapo" 'designs??'
Have fun
Stanislaw
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