Adding Power Supply to Radio

Hi, I am about to add a power supply jack to a battery operated transmitter that I have, so I can plug it in and not drain my batteries. Do I have to remove the batteries to uise the power supply? If so, can I incorporate a double throw switch into the design to select which is the current source of power? Should I switch both positive and negative? Thanks for the help!

by jsureke
March 06, 2020

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