Akashic Guitar effects circuit lookup
BIASBOOST

Enclosure not stated · 2 knobs

Effects Layouts (blog)

ThroBak Strange MasterVerified

Based on the Dallas Arbiter Rangemaster· 36 other boards clone it

Category
Boost
Controls
Bias · Boost
Build
Perfboard
Layout
Verified · Effects Layouts (blog) marks it as built and working
Tags
Boost, Throbak, Treble Boost
Open the layout at Effects Layouts (blog) Schematic

From the post

Essentially a Rangemaster with a switch selecting the input cap (Hi/Lo) and another switch (Ge/Si) selecting between a germanium or silicon transistor. The bias pot helps to fine tune the bias (imagine that lol) differences between germanium and silicon modes. Other transistors can be used other than what's specified. Something in the 100-120 hFE range for the germanium and something around 250 hFE for the silicon. Schematic here.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.

Parts list 14 rows

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RefValueNormalizedTypeNotes
Resistors 3
×1470K470kread from the layout by eye
×13.9K3.9kread from the layout by eye
×12.2M2.2Mread from the layout by eye
Capacitors 4
×14.7nF4.7nread from the layout by eye
×210nF10nread from the layout by eye
×1220pF220pread from the layout by eye
×247uF47uelectrolytic; read from the layout by eye
Diodes 1
×11N40011N4001read from the layout by eye
Transistors 2
Q12SD302SD30legend: 2SD30 or similar; read from the layout by eye
Q22N2222A2N2222Aread from the layout by eye
Potentiometers 2
BiasB250KB250kPotentiometerread from the layout by eye
BoostA10KA10kPotentiometerread from the layout by eye
Switches 2
Hi/LoSPDT on/onSPDT ON/ONtoggle; read from the layout by eye
Ge/SiDPDT on/onDPDT ON/ONtoggle; read from the layout by eye

Other boards based on the Dallas Arbiter Rangemaster