Enclosure not stated · 1 knob
Guild Brian May BoxVerified
Based on the Guild Brian May Box
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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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×2 | 6K8 | 6.8k | read from the layout by eye | |
| ×2 | 100K | 100k | read from the layout by eye | |
| ×2 | 100R | 100 | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 2K2 | 2.2k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| ×2 | 150K | 150k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 100p | 100p | read from the layout by eye | |
| ×1 | 4n7 | 4.7n | read from the layout by eye | |
| ×1 | 10n | 10n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×1 | 1u | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×2 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | MPS8098 | MPS8098 | read from the layout by eye | |
| Q2 | MPS8098 | MPS8098 | read from the layout by eye | |
| Potentiometers 1 | ||||
| Level | A250K | A250k | Potentiometer | read from the layout by eye |