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VOLUMEMASTERTREBLEBASSCUT

1590B · 5 knobs

Fuzz Dog· EngChan

English Channel - Vox Top-Boost In A Box

Based on the English Channel· 1 other board clones it

Category
Boost· OD/Dist/Preamp
Controls
Volume · Master · Treble · Bass · Cut
Difficulty
Hard
Price
£39.60
Tags
od-distortion

From the vendor

From the excellent project at Run Off Groove, here's a box of Vox that, erm... rocks! Based on a '61 Vox AC30 Top Boost, this overdrive gives all the rich, sparkling break-up of that classic amp. Highly tweakable tone with Volume (Gain), Bass, Treble, Treble Cut and Master Volume controls, and trim pots on all the FETs for perfect biasing. All in a package that'll fit a 1590B. WARNING: This circuit requires precise biasing of the FETs, so a Digital Multimeter is required. It'll be all-but impossible to do it by ear, hence the difficulty rating. Pot spacing is 21mm - take that into account when choosing your knobs. Board-mounted pots for minimal wiring and easy enclosure mounting. If you want the PCB without parts there's a link for that at the bottom of the page. Partial kit: PCB, all board-mounted components, pots. Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED. Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included. Inspired by: English Channel Difficulty: Hard PCB size: 100 x 22mm Knobs required: 5 Enclosure: 1590B Download INSTRUCTION PDF

Schematic

The schematic is in the vendor's build document, page 2. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 43 rows

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RefValueNormalizedTypeNotes
Resistors 17
R11M1M
R233K33k
R31K51.5k
R41K51.5k
R510K10k
R6100K100k
R710K10k
R81M1M
R91K21.2k
R101M1M
R11220K220k
R121K51.5k
R1347R47
R1415K15k
R1515K15k
R162K22.2k
R17220K220k
Capacitors 16
C1470p470p
C2100p100p
C322u22uelec
C422u22uelec
C547p47p
C622n22n
C722n22n
C847n47n
C910n10n
C1047n47n
C114n74.7n
C1222u22uelec
C1315n15n
C142n22.2n
C152n22.2n
C16100u100uelec
Transistors 5
Q1J201J201
Q2J201J201
Q3J201J201
Q4J201J201
Q5J201J201
Potentiometers 5
VOLUME500KAA500kPotentiometer
MASTER100KAA100kPotentiometer
TREBLE1MAA1MPotentiometer
BASS1MAA1MPotentiometer
CUT250KAA250kPotentiometer

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