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A friend has asked me to do a mod on their basic Sony AM/FM Radio (Model ICF306). It's 3V based but only accepts batteries. I thought about opening it up and soldering a 5.5mm Socket across the +/- battery terminals, but then figured this was probably not a good idea. If the batteries were present then you'd have the battery and the DC adapter in parallel. What's the best way to workaround this. Perhaps a Single Throw Double Pole switch (so you can either manually select battery or DC adapter pack sources) ?

Patrick Rynhart
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1 Answers1

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Most barrel jacks have a switch for just this purpose.

Typically you will put the switch in the negative side if the adapter is center-positive. You only need to disconnect the battery on one side when the adapter is plugged in.

See also this answer- image from there- enter image description here

Pin 3 will go to the battery (-) and will be disconnected when the plug is inserted (assuming center positive).

Spehro Pefhany
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