Ti Kan's STEPS

August 4, 2005

Photos of the STEPS power supply in use with my M³ and Millett Hybrid headphone amplifiers.

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This power supply is based on the STEPS (Single-voltage Tangent Easy Power Supply) v1.2 PCB from Tangent. I built two of these to power headphone amplifiers; one for my M³ and the other for my Millett Hybrid.
The two units are configured identically, as follows:
- Panasonic ELF 68mH common-mode filter, MKT interference suppression capacitors.
- Amveco 70062 25VA toroidal power transformer.
- Full wave bridge rectifier comprised of discrete International Rectifier MUR820 ultrafast recovery diodes, further stabilized with C0G snubber capacitors.
- Panasonic FC low-ESR high reliability capacitors (4x 1000µF, pre-regulator).
- National Semiconductor LM338T 5A adjustable voltage regulator mounted on heat sink.
- Trimpot-adjustable output voltage (set to 27V).
- Protection diodes and ripple-reduction capacitor at the voltage regulator.
- Front-mounted rocker power switch and blue LED indicator.
- Rear-mounted IEC AC power entry module with fuse, DC output jack.
Enclosure based on a Hammond 1455N1602BK extrusion and custom-made acrylic front and rear panels and top cover.

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