Bench power supply suggestions

Yes, 3.3v would make this ideal, the open frame supply shown in the opening post has +-12 and +-5v.

I got one of these for$140, a good value. 2X 0-30v 3amps and 5v 3amps, CV CC.
Series and parallel mode giving 0-60v 3amps or 0-30 6amps.

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