Mad Bean Pedals VFE Focus Manual de usuario

VFE Focus

From the VFE Website:

http://vfepedals.com/focus.html

Guitarists have long used tubescreamer-style overdrives as a clean mid boost by turning the gain down and

cranking up the output. The FOCUS is the answer to the search for a better, more versatile mid boost pedal.

Developed in collaboration with Adam “Nolly” Getgood from Periphery, the FOCUS employs variable bass and

treble cut lters for control over top end grit and low frequency saturation, no matter how many strings your

guitar has!

HOW THE Focus CAME TO BE

“My idea for the Focus came from many years of using various overdrive pedals to boost the front end of high-

gain amps, taking advantage of the natural high- and low-end ltering those pedals have, which results in the

unmistakably tightened and smoothed sound heard from countless rock and metal players both live and on

recording. Pretty soon I realised that using this common overdrive EQ and combining it with a clean boost could

accomplish the same result without the unnecessary clipping stage of an overdrive pedal. By making the lters

adjustable, the player could completely ne tune the response of their guitar and amplier without being stuck

with the xed lters of their usual boost pedal. I approached Peter at VFE and he understood what I was after

straight away - the Focus was born very soon afterwards.”

TIGHT: Sets the frequency roll off point of the variable bass cut. Turn counterclockwise to cut bass frequencies

for a tighter bottom end. RANGE: 70Hz to 1.5kHz.

SMOOTH: Sets the frequency roll off point of the variable treble cut. Turn clockwise to cut treble frequencies for

a smoother top end. RANGE: 320Hz to 7.2kHz.

LEVEL: Sets the gain of the output stage, up to 26dB of extra clean boost!

MIX: Blends between the dry signal (counterclockwise), and the EQ signal (clockwise). Use the blend to roll off

the strength of the bass and treble cuts.

SLOPE: Toggles each band between a 1-pole and 2-pole cut lter. More poles = sharper frequency rolloff.

INTERNAL CONTROL: The internal MAKEUP trimpot sets the makeup gain of the dry signal path. This trimpot

lets you set the relative volume of the EQ and dry signal paths, or you can use it to add even more clean boost

to the dry signal path.

FX TYPE: Ultimate Mid Boost

not offer Focus PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is, of course, okay.

Note: Use the values listed on the image above – not the values indicated on the silk-screen of the

PCB. Some values changed over time in the VFE product cycles.

Build Guide

Dimensions: 2.17” W x 2.025” H

Trace Routing

Knob Layout

Shopping List

QTY Value Type Rating Spacing

2 100R *see notes 1/4W 5mm

5 220R Metal / Carbon Film 1/4W 7.5mm

5 1k43 Metal / Carbon Film 1/4W 7.5mm

1 22k Metal / Carbon Film 1/4W 7.5mm

2 470k Metal / Carbon Film 1/4W 7.5mm

3 1M Metal / Carbon Film 1/4W 7.5mm

1 22pF MLCC 25v min. 2.5mm

6 100n MLCC 25v min. 2.5mm

2 47n Film 25v min. 5mm

2 100n Film 25v min. 5mm

3 220n Film 25v min. 5mm

1 1uF Film 25v min. 5mm

2 22uF Electrolytic 25v min.

3 OPA2134a or, other Dual Op-Amp

2 DPDT On/On, Pin Mount

1 2k Bourns 3362p

1 1kB PCB Plastic Shaft 9mm

1 50kA PCB Right Angle 16mm

2 10kA PCB Dual Gang 16mm

1) I suggest not using the two 100R resistors on the BOM and doing jumpers instead. Don’t be like

me: building this project blindly and sticking two 100R 1/8W resistors in there without thinking be-

cause they t the space. 100R 1/8W resistors will drop your supply voltages like a tank in jello. At

the roughly 60mA current draw on the Focus, you will end up with a whopping 2.2v drop across each

resistor.

This could be improved by using higher wattage resistors there (like 1/4W) and lower values (like 10R

or 22R) but ultimately, the circuit does not need the extra ltering or current limiting.

2) You can use 1k5 in place of the 1k43 resistors!

3) The OPA2134a is really expensive. You can try other, less expensive dual op-amps here. Anything

that is rated for 18v operation. Suggestions: TL072 or JRC4580DD.

BOM Notes

22pF (2.5mm MLCC): http://www.mouser.com/Search/ProductDetail.aspx?R=C315C220J5G5TAvir-

tualkey64600000virtualkey80-C315C220J5G

100n (2.5mm MLCC): http://www.mouser.com/Search/ProductDetail.aspx?R=C320C104K5R5TAvir-

tualkey64600000virtualkey80-C320C104K5R

Bourns 3362p (2k): https://www.mouser.com/ProductDetail/Bourns/3362P-1-202LF?qs=s-

GAEpiMZZMvygUB3GLcD7sb71EWCGEDbMej%2fZaROi94%3d

OPA2134a: http://www.mouser.com/Search/ProductDetail.aspx?R=OPA2134PAvirtualkey-

59500000virtualkey595-OPA2134PA

http://www.smallbear-electronics.mybigcommerce.com/ic-opa2604ap/

DPDT On/On (Pin Mount): http://www.smallbear-electronics.mybigcommerce.com/dpdt-on-on-short-

lever-pc-mount/

9mm Plastic Shaft (1kB): http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-

right-angle-pc-mount-w-knurled-plastic-shaft/

16mm PCB Mount (50kA): http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-

16mm-right-angle-pc-mount/

16mm Dual-Gang (10kA): http://www.smallbear-electronics.mybigcommerce.com/alpha-dual-gang-

16mm-pc-mount/

Build Notes

As recommended on pg.4, jumper the two spots for the 100R resistors like so:

Voltages

Version 1.1 of the Focus (the board that ships with this project) requires a 1M resistor soldered across

the two outside pins of the right-side DPDT. This was added to prevent a small switch pop. Ver. 1.3

(the one shown on the Trace layout on pg.2) has this resistor on the PCB.

PS: Insofar as I can tell, there is not real difference in v1.1, 1.2, or 1.3 of the PCB other than this 1M

resistor. He may have done small tweaks on the trace routing or values but the values listed in the

BOM are for the last version, which is 1.3.

All voltages on the ICs should read about 0v DC except pins 8 and 4.

Pin8 (all): +7.86v

Pin4 (all): -6.8v

This is with the two 100Rs jumpered and using a One Spot with 9.42 nominal.

Current Draw: About 57mA

Wiring

This project does require a charge pump on the Switching Board.

Schematic

Build

This pic was taken before adding the 1M jumper across the DPDT (right under the “Focus v1.1” text).

Also, the 100R resistors are on the PCB because I elected to short them on the bottom rather than

remove them (to lessen the chance of damaging it).

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