Power supplies, most tattoo guns are DC, and most power supplies come in two forms regulated, and non-regulated. Regulated means that the output voltage will always be what your setting says, if you choose 13 volts then the output will be 13 volts, nonregulated machines will give you an average of 13 volt output.
The regulated machines are more expensive, but save contacts and provide smoother running machines, and better tattoos. Attach your power supply to your gun; you should also have a footswitch setup so that it works as the on/off switch for power to your gun. Ensure that your gap has been set...
Tip: liners contacts should be set the width of a dime apart, and shaders should be set the width of a nickel apart. Turn on your power supply, set the output voltage to your desired speed, the higher the voltage the faster the machine will run, a fast smooth machine is good for lining, and a slower machine is preferred for shading, but practice will determine your use.
Step on your foot switch; ensure proper operation of your gun by observing needle bar movement, and needle tip movement. Look for needle wiggle, or shimmy, this will have to be corrected. Now listen to your gun, does it sound smooth, choppy, weak, or no sound at all. If your points are too far apart, the machine will not operate, turn in your contact screw until a nice smooth hum is achieved. This is the proper setting for that voltage, observe needle bar movement of between 1/16 th of an inch and 3/32nds of an inch at this time...your machine is now tuned.
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