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9 Volt Battery Connectors
Many Daqarta circuits use 9 V "transistor radio" batteries for power. Connectors for these batteries are readily available from electronics suppliers, with leads already attached. However, you may want to make your own from a discarded battery.
The battery is actually a bundle of 6 AAA-sized cells packaged in a steel jacket. The top is typically made of a heavy pressed cardboard-like material, into which the connector snaps are riveted. You will need to remove the jacket in order to get the top out. You can use pliers and heavy-duty side-cutters to take it off by brute force, or carefully saw around the top without sawing into the internal cells.
Once you get this out, you will typically find that it is connected to the internal cells via thin metal steel straps which are spot-welded to flat pads that are the bottoms of the connector snaps. You will need liquid rosin flux to solder to the pads; the rosin core of the solder alone is not enough.
Note that some batteries use plastic tops that will not withstand much heat when soldering. However, such batteries usually have a brass (or brass plated) connector eye that won't require as much heat as the solid steel pad, and will take solder readily. The instructions below assume you have the pressed cardboard type.
Pre-tin each lead wire, and rig up a way to hold the end against the pad, to keep your hands free for holding solder and iron. Apply plenty of heat until you have a nice smooth puddle of solder covering the pad (and wire), then carefully remove the iron and allow the joint to cool.
The joints won't be super-strong, so you need to protect them from mechanical stress. Carefully bend the connecting wires to the center of the connector, then out from the side so that they make a long-tailed 'T' from the connector.
Now cover the entire top of the connector, including the wires, with a thick layer of hot glue. This will make a nice, durable cap that can withstand repeated use.
See also Printed Circuit Construction
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