Akashic Guitar effects circuit lookup
LEVEL

Enclosure not stated · 1 knob

Tagboard Effects

Guild Brian May BoxVerified

Based on the Guild Brian May Box

Category
Boost
Controls
Level
Build
Vero· 14×15· 7 cuts, 3 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Booster, Buffer

From the post

This is a bit of an unusual one because I'm not even sure what it is. It's based on a schematic done by Analogguru and is obviously a Cornish buffer in front of a booster, so what I am assuming is that the Guild Brian May is the treble booster, and the whole circuit amounts to the modifications done by Pete Cornish when putting the effect in one of his boards for Brian.

Some or all of that may be wrong as it is just my assumption, so please correct me if anyone knows more, but the thought of a Cornish buffer into a Brian May treble booster seemed too good an opportunity to miss so I thought I'd have to do the layout! :o)

The input socket should be taken directly to the board input and so only a SPDT stomp is needed for the switching because the buffer remains in circuit during bypass (the stomp is the "Sw#" connections shown in the layout). You will of course need a DPDT stomp if you want to include an LED. For those wanting true bypass instead of the Cornish buffer .... shame on you! :o)

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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 24 rows

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RefValueNormalizedTypeNotes
Resistors 11
×26K86.8kread from the layout by eye
×2100K100kread from the layout by eye
×2100R100read from the layout by eye
×11M1Mread from the layout by eye
×11K1kread from the layout by eye
×22K22.2kread from the layout by eye
×122K22kread from the layout by eye
×115K15kread from the layout by eye
×14K74.7kread from the layout by eye
×2150K150kread from the layout by eye
×168K68kread from the layout by eye
Capacitors 9
×2100p100pread from the layout by eye
×14n74.7nread from the layout by eye
×110n10nread from the layout by eye
×147n47nread from the layout by eye
×1100n100nread from the layout by eye
×11u1uelectrolytic; read from the layout by eye
×110u10uelectrolytic; read from the layout by eye
×247u47uelectrolytic; read from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
Diodes 1
D11N40011N4001read from the layout by eye
Transistors 2
Q1MPS8098MPS8098read from the layout by eye
Q2MPS8098MPS8098read from the layout by eye
Potentiometers 1
LevelA250KA250kPotentiometerread from the layout by eye