Mad Bean Pedals Bumblebee Manual de usuario

Bumblebee

The Bumblebee is based on the Baldwin-Burns® Buzzaround™ with an added voltage inverter and volume knob. The

Bumblebee stands apart from the Fuzz Face and Tonebender. It’s not as nearly as bassy as the FF and it is capable of

getting even more fuzz saturation than the TB (IMO). At the same time, it can be tamed quite well into some classic (and

controlled) fuzz tones. And, the interaction with the guitar volume is absolutely excellent for dialing fuzz up and down on

the y.

Controls

Sustain – The overall fuzz amount from least to greatest.

Balance – A variable bias control for Q3.

Timbre – A simple tone control/capacitor blend.

Vol - Output volume.

Notes

The BumbleBee is a positive ground effect. However, it is wired as a negative ground circuit due to the voltage inverter circuitry.

The NKT213 is listed for the stock version of the BumbleBee. These are the transistors used in the original Buzzaround. Unfortunately,

they are very rare these days and almost impossible to nd. However, you can use any matched Tonbender set of PNP transistors in

place of the NKT213s. The OC75 is a very good replacement and offers an incredible fuzz tone. These are available as a matched set

from smallbear.

You can use the fancy round transistor sockets or inline sockets for Q1-Q3. The two pads in the middle are connected. Note that the

little tab is for the emitter.

The controls on this fuzz circuit are highly interactive. They are unusual in that the Sustain and Timbre are voltage dividers (the Vol con-

trol is as well but this is normal). This means when you turn them all the way down, it actually kills the signal. So, it takes a bit getting

used to because, as guitar players, we are not accustomed to having three knobs that kill our riffs. We like knobs that make our riffs

louder and crunchier, not puny and quiet. And, the Bumblebee certainly does that, too. To understand how it works think of it like this:

• The Sustain pot controls how much output signal from Q1/Q2 goes to Q3. Low settings means small signal and vice-versa. The

more signal, the more saturation. I tend to keep this under half-way up. After that it gets very unruly!

• The Balance pot varies the bias point on Q3. At low settings little or no voltage gets through to the Q3 collector so the overall out-

put is low (or off). When it’s turned up, the output swings upward (IOW louder) as Q3 is brought into bias. It is essentially acts as a

clamp on the Sustain pot in that allows you to dial down the output volume without reducing the total fuzz you get from the Sustain

control.

• The Timbre control is essentially a low cut in reverse. At low settings the low end frequencies atten out. As it is turned up more

bass (and more volume) gets through to the output.

• The most important thing to remember - every control you turn up makes this thing a lot louder and fuzzier. So, the added volume

control will help a lot to balance out different settings.

FX TYPE: FUZZ

Terms of Use: Etcher’s Paradise projects are meant for DIY use only. Sale of PCBs using the included artwork is strictly forbidden.

B.O.M.

Resistors Caps Diodes

R1 1M C1 100n D1 1n34a

R2 470k C2 4u7 D2 1N5817

R3 100k C3 4u7 Transistors

R4 10k C4 1n Q1 - Q3 PNP GE

R5 10k C5 100n IC

R6 3k3 C6 47uF IC1 TC1044SCPA

R7 27k C7 100n Pots

R8 15k C8 10uF BAL 5kB

R9 10k C9 10uF SUS 100kB

R10 4k7 TIMBRE 100kB

VOL 100kB

Shopping List

Value QTY Type Rating

3k3 1 Carbon / Metal Film 1/4W

4k7 1 Carbon / Metal Film 1/4W

10k 3 Carbon / Metal Film 1/4W

15k 1 Carbon / Metal Film 1/4W

27k 1 Carbon / Metal Film 1/4W

100k 1 Carbon / Metal Film 1/4W

470k 1 Carbon / Metal Film 1/4W

1M 1 Carbon / Metal Film 1/4W

1n 1 Film 16v min.

100n 3 Film 16v min.

10uF 2 Film 16v min.

4u7 2 Electrolytic 16v min.

47uF 1 Electrolytic 16v min.

1n34a 1 or, similar GE diode

1N5817 1

PNP GE 3 *your choice

TC1044SCPA 1 or, MAX1044CPA

5kB 1 PCB Right Angle 16mm

100kB 3 PCB Right Angle 16mm

Layout

Traces

2.08” W x 2.08”H

1590B Drill Guide

Schematic

Tabla de contenidos

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