ZEN

1590a overdrive project

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ZEN Step 1 of 1

Effect type: overdrive

Pedal description

Rated as one of the best guitar overdrives, this DIY project is the ZeN and is based upon the famous Zendrive. The board of this project is designed to fit in a 1590A enclosure or similar, but if you haven't previous experience we recommend to build the project in a 1590B or 1590BB enclosure.

Controls

Gain
Tone
Volume
Voice

Kit contents

Capacitors
1x 100pF 50V Ceramic Disc Capacitor

1x 3.3nF 0.0033uF 100V 5% Polyester Film Box Type Capacitor

1x 100nF 0.1uF 100V 5% Polyester Film Box Type Capacitor

2x 470nF 0.47uF 100V 5% Polyester Film Box Type Capacitor

1x 47uF 16V 105C Radial Electrolytic Capacitor 5x11mm

1x 100uF 16V 105C Radial Electrolytic Capacitor 5x11mm

Transistor

2x 2N7000 MOSFET N-CHANNEL 60V 0.2A

Diodes
3x        BAT41 Shottky Barrier Diode

Resistors

3x 1K OHM 1/4W 1% Metal Film Resistor

3x 10K OHM 1/4W 1% Metal Film Resistor

1x 470K OHM 1/4W 1% Metal Film Resistor

1x 2M OHM 1/4W 1% Metal Film Resistor

Potentiometer

1x 100K OHM Logarithmic Taper Potentiometer Round Shaft PCB 9mm

1x 10K OHM Linear Taper Potentiometer Round Shaft PCB 9mm

1x 500K OHM Linear Taper Potentiometer Round Shaft PCB 9mm

1x 50K OHM Linear Taper Potentiometer Round Shaft PCB 9mm

IC'S

1x NJM4558 4558 Dual Operational Amplifier General Purpose IC

NOTE: We recommend to use 9mm pots if you are going to build this project in a 1590A enclosure, but if you choose a bigger box, you can use full size pots.

Hardware
1x        ZEN PCB BOARD
1x        1590A Style Aluminum Diecast Enclosure

1x        3MM BEZEL LED HOLDER CHROME METAL
1x        DC Power Jack 2.1mm Enclosed Frame With Switch External
2x        6.35mm 1/4" Stereo Phone Jack
1x        3PDT STOMP FOOT / PEDAL SWITCH

4x        Knob DAVIES 1900H CLONE Black
1x        AWG 22 BLACK HOOK-UP WIRE 1FT (30CM) STRANDED
1x        AWG 22 RED HOOK-UP WIRE 1FT (30CM) STRANDED
1x        AWG 22 WHITE HOOK-UP WIRE 1FT (30CM) STRANDED

NOTE: This kit is for the 1590A version, if you're going to use a 1590B or 1590BB enclosure you can use other jacks and knobs and you could add a battery clip using one stereo jack and one mono jack.

Important:

We recommend to use low profile jacks in order to gain more space but the TAYDA enclosed jacks listed in this kit will work too.
The board has enough space to put the electrolitic caps in horizontal but if you can find 100uF and 47uF 5x7mm or 6x7mm, these will work perfect in the standard position.

PCB DESIGNATORS:

Capacitors
C1	470nF
C2	100pF
C3	100nF
C4	3,3nF
C5	470nF
C6	100uF
C7	47uF
Diodes
D1	BAT41
D2	BAT41
D3	BAT41
IC'S
IC1	NJM4558
Transistors
Q1	2n7000
Q2	2n7000
Resistors
R1	2M
R2	470K
R3	1K
R4	10K
R5	1K
R6	10K
R7	10K
R8	1K
Pots
GAIN	500kB
TONE	50kB
VOICE	10kB
VOL	100kA