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Step 7Reconnect the Batteries
This AC socket includes a normally-closed switch on the shell (ground), so that you can power your device as built with the batteries, but when you plug in the adapter the batteries are disconnected (and not shorted to ground or reverse biased).
Strip the ends of the black wire (and cut it to a nicer length if desired) to expose about 1/8". Solder one end to the negative terminal of the battery compartment, and solder the other end to the NC switch connector (3 o'clock position) on the AC socket. When the AC adapter is not plugged in this provides the return path from the circuit board to the batteries' negative terminal.
Strip the ends of the red wire the same way. Solder one end to the positive terminal of the battery compartment, and solder the other end to the center pin connector (9 o'clock position) on the AC socket. You already have the built-in red lead on that center pin, so you may not need additional solder for this connection.
Now, the batteries are connected into the circuit almost as before. With the AC adapter unplugged, the batteries provide current through the two red leads, and the return path goes up the black lead to the AC socket, through the closed switch, and back to the batteries.
When you plug in the AC adapter, the batteries are disconnected from the circuit and current comes from and returns to the adapter through the original red and black leads.
Strip the ends of the black wire (and cut it to a nicer length if desired) to expose about 1/8". Solder one end to the negative terminal of the battery compartment, and solder the other end to the NC switch connector (3 o'clock position) on the AC socket. When the AC adapter is not plugged in this provides the return path from the circuit board to the batteries' negative terminal.
Strip the ends of the red wire the same way. Solder one end to the positive terminal of the battery compartment, and solder the other end to the center pin connector (9 o'clock position) on the AC socket. You already have the built-in red lead on that center pin, so you may not need additional solder for this connection.
Now, the batteries are connected into the circuit almost as before. With the AC adapter unplugged, the batteries provide current through the two red leads, and the return path goes up the black lead to the AC socket, through the closed switch, and back to the batteries.
When you plug in the AC adapter, the batteries are disconnected from the circuit and current comes from and returns to the adapter through the original red and black leads.
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