Enclosure not stated · 4 knobs
Walrus Audio MayflowerVerified
Based on the Walrus Audio Mayflower· 2 other boards clone it
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
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×4 | 10K | 10k | read from the layout by eye | |
| ×3 | 510K | 510k | read from the layout by eye | |
| ×2 | 3K3 | 3.3k | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 100R | 100 | read from the layout by eye | |
| ×1 | 3K9 | 3.9k | read from the layout by eye | |
| ×1 | 5K6 | 5.6k | read from the layout by eye | |
| ×1 | 5K1 | 5.1k | read from the layout by eye | |
| Capacitors 8 | ||||
| ×3 | 1u | 1u | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×1 | 10n | 10n | read from the layout by eye | |
| ×1 | 100p | 100p | read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| ×2 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | MPSA18 | MPSA18 | read from the layout by eye | |
| Q2 | MPSA18 | MPSA18 | read from the layout by eye | |
| ICs 1 | ||||
| ×2 | RC4558P | RC4558P | two 8-pin ICs drawn; legend: IC is RC4558P; read from the layout by eye | |
| Potentiometers 4 | ||||
| Gain | A500K | A500k | Potentiometer | read from the layout by eye |
| Bass | B50K | B50k | Potentiometer | read from the layout by eye |
| Treble | B50K | B50k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
Other boards based on the Walrus Audio Mayflower
- Walrus Audio Mayflower Dirtbox Layouts
- Walrus Audio Mayflower Effects Layouts (blog)