Mad Bean Pedals Turnabout User manual

Turnabout

FX TYPE: Distortion

Based on the JHS® @™

Enclosure Size: 1590B, 1590B2, 125B

“Softie” compatibility: Softie1&2

Overview

The Turnabout is a variation of the Andy Timmons pedal produced by JHS®, which is in turn pretty

much a clone of the MI Audio Crunchbox. It produces thick, meaty distortion to emulate cranked 4x12

type tones. The Turnabout offers two additions: an asymmetrical clipping option and a thickness

control to dial in the low end.

Controls

• VOL: Total output.

• GAIN: From medium to high gain distortion. The gain control is interactive with the Thicc control.

• TONE: Low pass lter.

• PRES: The Presence control is interactive with the Tone control. Higher values increase the

overall presence which in turn pushes the tone control into a brighter range.

• THICC: Controls the amount of low end sent to the clipping stage.

• COMP: LED, Schottky and asymmetrical clipping. LED is the loudest (stock to the CrunchBox),

Schottky is the most compressed and the asymmetrical mosfet clipping is in-between.

Terms of Use: You are free to use purchased Turnabout circuit boards for both DIY and small commercial operations. You may not

offer Turnabout PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is ne, though.

Technical assistance for your build(s) is available via the madbeanpedals forum. Please go there rather than emailing me for

assistance on builds. This is because (1) I’m not always available to respond via email in a timely and continuous manner, and (2)

posting technical problems and solutions in the forum creates a record from which other members may benet.

Parts Turnabout

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Values Turnabout

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Traces Turnabout

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B.O.M. Turnabout

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Resistors Caps Diodes

R1 1M C1 22n D1, D2 LED

R2 1k C2 1n D3 BAT46

R3 1M C3 100pF D4, D5 BAT41

R4 1k C4 47n D6 1N4001

R5 1k C5 100n Transistors

R6 10k C6 100pF Q1, Q2 2N7000

R7 1M C7 1uF IC

R8 470R C8 22n IC1 LM833

R9 47R C9 22n Switch

R10 4k7 C10 470n COMP On/Off/On

R11 22k C11 100uF Pots

R12 22k C12 100n TONE 10kC

C13 10uF PRES 25kB

THICC 25kB

VOL 100kA

GAIN 100kB

Shopping List Turnabout

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Value QTY Type Rating

47R 1 Metal Film 1/4W

470R 1 Metal Film 1/4W

1k 3 Metal Film 1/4W

4k7 1 Metal Film 1/4W

10k 1 Metal Film 1/4W

22k 2 Metal Film 1/4W

1M 3 Metal Film 1/4W

100pF 2 Ceramic / MLCC / Mica 16v min.

1n 1 Film 16v min.

22n 3 Film 16v min.

47n 1 Film 16v min.

100n 2 Film 16v min.

470n 1 Film 16v min.

1uF 1 Film 16v min.

10uF 1 Electrolytic

100uF 1 Electrolytic

LED 2 RED, Diffused 5mm

BAT46 1

BAT41 2

1N4001 1

2N7000 2

LM833 1

SPDT 1 On/Off/On, Solder Lug

10kC 1 PCB Mount, Plastic Shaft 9mm

25kB 2 PCB Mount, Plastic Shaft 9mm

100kA 1 PCB Mount, Right Angle 16mm

100kB 1 PCB Mount, Right Angle 16mm

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Parts Guide Turnabout

LM833N:

https://www.mouser.com/ProductDetail/926-LM833N-NOPB

The LM833N should be available at smallbear, as well.

BAT46:

https://www.mouser.com/ProductDetail/511-BAT46

http://smallbear-electronics.mybigcommerce.com/diode-schottky-bat46/

BAT41:

https://www.mouser.com/ProductDetail/511-BAT41

http://smallbear-electronics.mybigcommerce.com/diode-schottky-bat41/

2n7000:

https://www.mouser.com/ProductDetail/512-2N7000

http://smallbear-electronics.mybigcommerce.com/transistor-fet-2n7000/

SPDT (On/Off/On):

http://smallbear-electronics.mybigcommerce.com/spdt-short-lever-center-off/

9mm Plastic Shaft Pots (10kC, 25kB):

http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-pc-mount/

The 10kC plastic shaft pots are very difcult to nd right now. Suggest subbing in a linear pot (B

taper).

16mm Right Angle Pots (100kA, 100kB):

http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-16mm-right-angle-pc-mount/

Thinline DC Jack:

http://smallbear-electronics.mybigcommerce.com/dc-power-jack-all-plastic-unswitched-2-1-mm/

Enclosed Mono:

http://smallbear-electronics.mybigcommerce.com/1-4-in-mono-enclosed-jack/

http://smallbear-electronics.mybigcommerce.com/1-4-in-mono-enclosed-switchcraft-111x/

Lumberg Mono:

http://smallbear-electronics.mybigcommerce.com/lumberg-1-4-compact-shrouded-mono-jack/

Notes Turnabout

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• To understand the best way to use the Tone and Pres controls think of it this way: the Presence

control is what you use to set the maximum range of the Tone control. It’s what you will change

rst when plugging in different guitars or to different amps. Then the Tone control is used

continuously to set the amount of ltering you want for a particular sound. Darker amps and

guitars with humbuckers will generally have a higher Pres setting than say, a Vox amp or Tele

style guitar (unless you really WANT to punish everyone around you!)

• The Thicc control lets you dial out some of the bass in the stock @ pedal as well as put in a little

extra if you like. At lower Thicc settings, the maximum amount of distortion will also be reduced.

So, in general, when you want to get the lowest gain amount possible out of the Turnabout you

are going to turn down the Thicc and Gain controls and set the Comp switch for the least amount

of compression (the LEDs). The Thicc control also lets you shovel some mud out of neck pickups,

too.

• The clipping LEDs will light up when they are selected so if you like blinky lights you can mount

one or both externally.

Wiring Diagram Turnabout

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1590B Drill Guide Turnabout

Note: Drill Guides are approximate and may require tweaking depending on the types of jacks, switches and pots you use.

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• This is a tight t, but should work if you use the Lumberg or open-frame style

1/4” jacks.

• I don’t recommend using any of the mbp 3pdt boards for this enclosure.

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