Finishing my small linear bench power supply with an adjustable current limit. The voltage regulation uses LM317, the current limiter uses an OpAmp (MC33171) for better accuracy. Its output voltage can be adjusted from 1.25V to 5.5V and the current from 0 to 200mA. I build it mostly to test logic circuits and microcontrollers, but also circuits sensitive to interference. Using an iron mains transformer and a linear regulator, this PSU produces no switching noise. The transformer was BVEI3048013, later I replaced it using a bit more powerful BVEI3068016. Showing the process of designing it, building it, the full schematic and how does it work.
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The power supply on my website:
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