Akashic Guitar effects circuit lookup
GAINFILTERVOLUME

Enclosure not stated · 3 knobs

Effects Layouts (blog)

ProCo RAT ('86 version)Verified

Based on the ProCo RAT· 41 other boards clone it

Category
Distortion
Controls
Gain · Filter · Volume
Build
Perfboard
Layout
Verified · Effects Layouts (blog) marks it as built and working
Tags
Distortion, ProCo
Open the layout at Effects Layouts (blog)

From the post

Since I did the Blower Box yesterday, and it's essentially a RAT, I figured it wouldn't take too much effort to convert that layout to the original. So here's the original '86 RAT.

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 25 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • D1, D2: the legend prints '2N4148', entered as 1N4148
RefValueNormalizedTypeNotes
Resistors 7
×31M1Mread from the layout by eye
×2100K100kread from the layout by eye
×21K1kread from the layout by eye
×247Ω47read from the layout by eye
×11.5K1.5kread from the layout by eye
×110K10kread from the layout by eye
×1560Ω560read from the layout by eye
Capacitors 10
×222nF22nread from the layout by eye
×110nF10nread from the layout by eye
×13.3nF3.3nread from the layout by eye
×11nF1nread from the layout by eye
×130pF30pread from the layout by eye
×1100pF100pread from the layout by eye
×1100uF100uelectrolytic; read from the layout by eye
×24.7uF4.7uelectrolytic; read from the layout by eye
×12.2uF2.2uelectrolytic; read from the layout by eye
×21uF1uelectrolytic; read from the layout by eye
Diodes 3
D11N41481N4148legend prints 2N4148; read from the layout by eye
D21N41481N4148legend prints 2N4148; read from the layout by eye
×11N40011N4001read from the layout by eye
Transistors 1
Q12N54582N5458JFET; read from the layout by eye
ICs 1
×1LM308LM308read from the layout by eye
Potentiometers 3
GainA100KA100kPotentiometerread from the layout by eye
FilterA100KA100kPotentiometerread from the layout by eye
VolumeA100KA100kPotentiometerread from the layout by eye

Other boards based on the ProCo RAT