Akashic Guitar effects circuit lookup
GAINBASSTREBLEVOLUME

Enclosure not stated · 4 knobs

Tagboard Effects

Walrus Audio MayflowerVerified

Based on the Walrus Audio Mayflower· 2 other boards clone it

Category
Overdrive
Controls
Gain · Bass · Treble · Volume
Build
Vero· 20×17· 20 cuts, 12 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Overdrive

From the post

Thanks to Matt for his schematic for this buffered Timmy. Info about the original:

The Mayflower is a true bypass, midrange overdrive pedal that falls in-between the Voyager’s low gain preamp settings and the Iron Horse’s full and harmonically rich distortion. The Mayflower boasts a transparent, midrange signal that is great for cutting through or adding to the rhythm. It includes Level, Drive, Bass and Treble controls for a large range of tonal versatility. The Mayflower provides a transparent and organic sounding breakup that allows tweaking and shaping to boost your original tone.

Only one channel of the second IC is being used, and that is only being used to buffer the reference voltage. There are a lot of pedals that work perfectly well without doing this, not least of which the pedal it's based on, and so as this is a low-ish gain Timmy with buffers I'm not too worried about excess noise. So to save space this layout removes the second IC completely and just uses a normal unbuffered voltage divider for vref. I don't expect any significant audible differences between the two so I think this is the one I'd build.

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 27 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • Two unlabelled 8-pin ICs are drawn (centre and bottom right); legend says only 'IC is RC4558P', so both are entered as RC4558P - the second could be another part
RefValueNormalizedTypeNotes
Resistors 10
×410K10kread from the layout by eye
×3510K510kread from the layout by eye
×23K33.3kread from the layout by eye
×120K20kread from the layout by eye
×11K1kread from the layout by eye
×11M1Mread from the layout by eye
×1100R100read from the layout by eye
×13K93.9kread from the layout by eye
×15K65.6kread from the layout by eye
×15K15.1kread from the layout by eye
Capacitors 8
×31u1uread from the layout by eye
×1100n100nread from the layout by eye
×147n47nread from the layout by eye
×110n10nread from the layout by eye
×1100p100pread from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
×247u47uelectrolytic; read from the layout by eye
×110u10uelectrolytic; read from the layout by eye
Diodes 2
D11N41481N4148read from the layout by eye
D21N41481N4148read from the layout by eye
Transistors 2
Q1MPSA18MPSA18read from the layout by eye
Q2MPSA18MPSA18read from the layout by eye
ICs 1
×2RC4558PRC4558Ptwo 8-pin ICs drawn; legend: IC is RC4558P; read from the layout by eye
Potentiometers 4
GainA500KA500kPotentiometerread from the layout by eye
BassB50KB50kPotentiometerread from the layout by eye
TrebleB50KB50kPotentiometerread from the layout by eye
VolumeA10KA10kPotentiometerread from the layout by eye

Other boards based on the Walrus Audio Mayflower