aion SAPPHIRE Manual - Página 6

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BUILD NOTES

Using SMD JFETs

The 2SK184-GR JFET is no longer available in through-hole format. This PCB uses a hybrid through-

hole/SMD outline for each JFET. An extra "G" (gate) pad is included to accommodate surface-mount

devices without the need for adapters.

SMD JFETs should be oriented as follows:

All surface-mount JFETs use the same pinout, so this configuration will fit any type that we're aware of.

However, always check the datasheet if you're uncertain—they're difficult to desolder.

Using through-hole adapters

If you're not confident in your ability to work with surface-mount parts, Aion FX offers

2SK209-GR

JFETs

(the SMD version of 2SK184-GR and 2SK117-GR) that come pre-soldered to adapters for use

in through-hole designs. These are from the same manufacturer as the ones used in the original BOSS

pedals and will perform identically.

Using old-stock transistors

Toshiba has not manufacturered through-hole transistors and JFETs in many years, but it's still possible

to find the 2SK184-GR as well as the four types of BJT transistors used in the original. However, be

aware that these follow the Japanese pinout conventions, whereas the PCB layout is set up for USA

conventions since there are a lot more widely-available substitutes in this format.

For those using original Toshiba through-hole JFETs or BJTs, an extra pad has been added to the left of

the transistor outline (drain for JFETs, emitter for BJTs) so that the Japanese pinout can be easily used

without needing to twist the legs around. In both cases, the transistor should be rotated 180 degrees

from the silkscreen and shifted by one pad, as shown:

BJT

JFET

SAPPHIRE AMP OVERDRIVE