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I dont understand what are you trying to say so let me just tell what i think u are asking. u will never touch -22 with ground or it will short circuit and your battery might get fire/damage. There is no such thing as voltage. its always a voltage difference (which means if I have a 22V battery/Supply it implies that the positive terminal of the battery is 22Volts higher than the negative terminal) so If you want to generate -22V All you need to do is connect the Positive terminal of your battery with the ground of the circuit (Ground is generally at 0 Volts so) your negative terminal gets 22V lower than it (0 - 22 = -22V). Its just a perception of it. I repeat there is no such thing as negative voltage.
"can draw up to 3.5" is only in an extreme case. The IDEAL supply ratings should be voltage = 8 - 18V and the current = 3.5A.BUT always remember the IC will Never give you more than 12W output so whats the point of using a 3.5A supply? plus the whole point of this instructable is to make an amplifier, power supply is upto you people.I personally didnt wanted to buy a new power supply so used the one that i made already.
The issue is with supplies... try using a battery and there WONT b any distortion.. power supplies convert AC to DC and yet there is a little AC component left no mattter how many capacitors you use ... that is why there is distortion.. in high quality supplies it will be less but will be still there .. as you can hear it in the video link too.. but after that i used a lead acid battery and it worked like a charm.
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