|This is a rarity - a single unit that provides octave up AND down. |
As an octaver, it is decidedly a step or two up in terms of complexity, compared to most octave boxes. Although the schematic only indicates the three pitches (fundamental, octave up, octave down), it is potentially expandable to other intervals, though you need a bit of knowhow.
Some of the components may seem unfamiliar, but they are easily substituted for. The 1N60 diodes can be subbed with 1N34 or 1N270. The other diodes are easily replaced with 1N914/4148.
You will note the presence of a DC-to-DC converter, and FET-based switching.
The document is in Japanese, but the technical information is straightforward enough if your Kanji/Kana skills are not up to par.
As with anything on this site, by the time scans are cropped, tweaked, and printed out again, the scaling of the PCB layouts may not be precise. You may have to rescale to produce a Press-N-Peel layout.
The zip-file with all pages is 1.2meg in size, and scanned at 200dpi.