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GAINHIGHBASSLEVELMASTERMID

125B · 6 knobs

PCB Guitar Mania

JC-800 Pre-amp simulator SMD

Based on the JFET Conversion· 1 other board clones it

Category
Overdrive· Overdrive/Pre-amp
Controls
Gain · High · Bass · Level · Master · Mid
Difficulty
Easy
Price
€19.90out of stock
Tags
smd

Heads up Builders widely report inconsistent quality from PCB Guitar Mania boards, and whether a given board works is a gamble. Read recent forum reports before ordering.

From the vendor

About The Pedal Creators

Everyone can build excellent boutique guitar pedals. Everything we do is to make that experience more accessible and user-friendlier. The Pedal Creators series are the best and easiest to build PCBs ever. Including most resistors and capacitors already soldered on board as SMD components, leaving the key values for you to experiment and craft your own tone. Now you can build a pedal you are proud of in less than an hour without any previous experience. What are you waiting for to become a Pedal Creator?

The Pedal creators – key features:

• Easy to build, no previous experience required. It’s like Lego for musicians.

• Fast assembly finish a pedal in less than an hour. Play your favorite record and enjoy the ride along.

• 100% mistake-proof. Even my grandma can build one while she cooks.

• Build your own boutique pedal. Experiment with different values and make the pedal you always dreamed of.

• Easy to scale. Turn your passion into a money-making machine.

Project overview

The JCM 800 pre-amp emulates the tone of the classic Marshall’s JCM 800, using the same circuit schematic that you will find in the most famous British Amps from the ’80s, using JFET transistors instead of vacuum tubes. Try this board and put the intense tone of their JCM 800 amplifier into your

pedalboard. This is a wide-ranging, British-flavored overdrive that can be pushed well into the high-gain territory.

Introduction

This circuit has been developed to recreate all the gain and tone from the famous Marshall’s JCM 800 Pre-amps, replacing the vacuum tubes for the JFET J201. This design’s origin goes back to 2004 by a schematic published by Electric, following the same conversion style as the ROG designs as the Azabache, Britania, Thunderbird, etc.

This version includes five trimmers to bias the JFET according to your taste. It also features pads to use standard through-hole J201 or the more available and reliable SMD version.

• Powered by six J201.

• Five Internal Trimpot to regulate bias of the transistors.

• Designed to use onboard potentiometers. Keep it tidy without using cables!

• The compact format fits perfectly in a 125B enclosure

Controls

• Bass: Tonefor the bass frequencies.

• Mids: Tone for the mids frequencies.

• Treble: Tone for the treble frequencies

• Master: Controls the output gain of the preamp.

• Level: Controls the output volume

• Gain: Controls the preamp gain

For any technical questions regarding this build don’t f

Schematic

The schematic is in the vendor's build document, page 8. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 22 rows

Report a wrong parse
RefValueNormalizedTypeNotes
Capacitors 3
C1680n680n
C141uf1u
C15100uf100u
Diodes 2
D11n40011N4001
D23mm3MM
Transistors 6
Q1J201J201
Q2J201J201
Q3J201J201
Q4J201J201
Q5J201J201
Q6J201J201
Potentiometers 6
GAIN1MAA1MPotentiometer
HIGH250KBB250kPotentiometer
BASS1MAA1MPotentiometer
LEVEL100KAA100kPotentiometer
MASTER1MAA1MPotentiometer
MID25KBB25kPotentiometer
Trimmers 5
TRIM1100K100kTrimmer
TRIM2100K100kTrimmer
TRIM3100K100kTrimmer
TRIM4100K100kTrimmer
TRIM5100K100kTrimmer

Other boards based on the JFET Conversion