background image

The power and signal pads on the PCB

conform to the FuzzDog Direct Connection

format, so can be paired with the appropriate

daughterboard for quick and easy offboard

wiring. Check the separate daughterboard

document for details.
Be very careful when soldering the transistors

if you aren’t using sockets (why not?). They’re

very sensitive to heat. You should use some

kind of heat sink (crocodile clip or reverse

action tweezers) on each leg as you solder

them. Keep exposure to heat to a minimum

(under 2 seconds).
Snap the small metal tag off the pots so they

can be mounted flush in the box.
You should solder all other board-mounted

components before you solder the pots. Once

they’re in place you’ll have no access to much

of the board. 
Trimmers should mount on the same side of

the PCB as the pots, as shown.

Once everything is soldered in place you

need to adjust the trimmers to bias the

transistors. Q1 is fixed bias, but you

adjust T1 and T2 to change the voltages

on the collectors of Q2 and Q3 respectively

(marked above).
There are no definitive ‘correct’ voltages, but

you should be in the ballpark of:
Q2 - 1.0 - 1.75V
Q3 - 8.0 - 8.5V
Set Q2’s bias first before tweaking Q3, as the

T1 trimmer will affect both.
It’s a case of tweaking by ear within those

ranges until you get the sound you want.

Sweet, sustained fuzz without gating.

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Содержание Tone Bender Mk II

Страница 1: ...ToneBenderMkII Sweet smooth fuzz Contents of this document are 2021 Pedal Parts Ltd No reproduction permitted without the express written permission of Pedal Parts Ltd All rights reserved ...

Страница 2: ...wise stated in this document this circuit is designed to be powered with 9V DC COMPONENT SPECS Unless otherwise stated in this document Resistors should be 0 25W You can use those with higher ratings but check the physical size of them Electrolytics caps should be at least 25V for 9V circuits 35V for 18V circuits Again check physical size if using higher ratings LAYOUT CONVENTIONS Unless otherwise...

Страница 3: ... above shows the original PNP Positive Ground layout which is also how the PCB is designed What does that mean Well basically it means it won t play nicely with normal pedals if you try to daisy chain them on the same power supply Don t do it It s perfectly simple to make a NPN Negative Ground version Use NPN transistors flip the orientation polarity of C2 C4 and C6 then follow the appropriate wir...

Страница 4: ...in the box You should solder all other board mounted components before you solder the pots Once they re in place you ll have no access to much of the board Trimmers should mount on the same side of the PCB as the pots as shown Once everything is soldered in place you need to adjust the trimmers to bias the transistors Q1 is fixed bias but you adjust T1 and T2 to change the voltages on the collecto...

Страница 5: ...IN and OUT to the jacks as shown Connect all the GNDs together twist them up and add a small amount of solder to tack it Connect the battery lead to the V wire same method Plug in Go It may look strange but as this is a positive ground circuit the 9V power goes to the GND of the circuit and the jacks If you re using a ribbon cable you can tack the wires to the ends of that It s a lot easier to tak...

Страница 6: ...wire to the board connections for V GND IN and OUT Connect IN and OUT to the jacks as shown Connect all the GNDs together twist them up and add a small amount of solder to tack it Connect the battery lead to the V wire same method Plug in Go If you re using a ribbon cable you can tack the wires to the ends of that It s a lot easier to take them off there than it is do desolder wires from the PCB p...

Страница 7: ... IN jack then daisy chain that over to the OUT jack It doesn t matter how they all connect as long as they do This circuit is standard Negative GND Your power supply should be Tip Negative Sleeve Positive That s the same as your standard pedals Boss etc and you can safely daisy chain your supply to this pedal BOARD OUT BOARD 9V BOARD GND BOARD GND BOARD INPUT BATTERY IN OUT BOARD GND L E D L E D B...

Страница 8: ...ack then daisy chain that over to the OUT jack It doesn t matter how they all connect as long as they do This circuit is standard Negative GND Your power supply should be Tip Negative Sleeve Positive That s the same as your standard pedals Boss etc and you can safely daisy chain your supply to this pedal L E D BOARD OUT BOARD 9V BOARD GND BOARD GND BOARD GND BOARD INPUT BATTERY IN OUT L E D BOARD ...

Страница 9: ...arts Ltd can accept no responsibility for incorrect drilling of enclosures FuzzDog co uk Drilling template Hammond 1590B 60 x 111 x 31mm It s a good idea to drill the pot and toggle switch holes 1mm bigger if you re board mounting them Wiggle room good Recommended drill sizes Pots 7mm Jacks 10mm Footswitch 12mm DC Socket 12mm Toggle switches 6mm 32mm ...

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