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Fuzzy Joe v1.1 

 

Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the 
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement 

is implied.

 

I strongly suggest you install the “Sag”. My best tones came from using it and at 

-9V some transistors 

from the batch just could not produce a good sound at all! And it is switchable so if you do not agree 

with me… switch it off

 or turn the pot all the way to the left to produce -9V!

 

Build sequence 

Soldering this board can be very complicated for some people since the solder pads are very close 
together. Use a magnifying glass to make the job easier. The trick to soldering a PCB is to work from 
small to big components. My building sequence suggestions in this section are based on the parts I 
used myself. Sometimes some components are smaller (or bigger) so always use your own common 
sense and change the order accordingly. Usually capacitors can differ a lot in size depending on their 
rating and value. 

Note:

 Do not blow on your solder in an attempt to cool it down. That can result in a bad join that 

might corrode! 

Start by soldering the resistors and jumpers (if needed). Next come the diodes, IC socket. If needed 
you can create a jumper using a spare piece of lead from a resistor or diode. If you want to 
experiment with other transistors then you could socket them instead of soldering them to the 

board. You’ll need a 

some 20 SIL sockets, break off the sockets and solder them to the board. Now is 

the time to solder these sockets on the PCB as well as the socket for the IC. Place the transistors and 
IC once you are finished with all soldering and off board wiring! 

Now continue by soldering the SMF and MKT capacitors then solder the internal trimpots (

VR

). Now 

finish with soldering the transistors (if not socketed) and the electrolytes.  

I suggest you now drill the holes in your enclosure so you can use it during the off board wiring.  

Note:

 Really take some time to determine where to place the pots, switches, jacks and  PCB in the 

enclosure before you start drilling. Measure twice, drill once. 

You are almost ready to rock

, well… not really

. The difficult part starts now.  

Besides the components mentioned in the components table, you will need: 

 

2 mono input jacks

 

1 x 3PDT footswitch

 (9 pins)  

 

2,1mm DC jack

 (isolated).  

 

9v battery clip

 (optional).

 

 

22 gage stranded hook-up wire. 

 

LED holders. 

This enables you to mount the LEDs in the enclosure. 

 

1 x LED (3mm or 5mm depending on your taste)

 

 

Hammond 125B

 case (or similar) in your favorite color.  

 

Summary of Contents for Fuzzy Joe

Page 1: ...Fuzzy Joe Building instructions v1 1 ...

Page 2: ...tents PCB layout 3 Components 4 Power section 5 Battery only 5 Switchable Voltage Inverter 5 Build sequence 6 Off board wiring 7 Potentiometers 7 Battery only wiring 7 Voltage Inverter wiring 8 Biasing 9 Fixed resistors 9 Transistors and resistors 9 Troubleshooting 10 Schematic 11 Read this entire manual thoroughly before you start building the effect There are some available options and you shoul...

Page 3: ...for circuit identification and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author No cooperation or endorsement is implied 3 PCB layout Dimensions 44 mm x 38 6 mm 1 73 inch x 1 52 inch ...

Page 4: ...maybe hard to find or expensive You could just get a A500k and ask your vendor to get one of around 470k as most pots are rated 10 or more Note that the original uses 400V axial electrolytes for C5 and C7 capacitors They will fit in an upright position but I advise you use radial electrolyte capacitors and choose the good ones like Elna Fine Gold Panasonics etc that will fit C6 is originally a foi...

Page 5: ...g battery by using a sag pot VR1 You can use this as a set and forget by installing an internal 6mm trim pot or as an extra external 16mm sag pot so you can easily adjust the sag during play With the current R7 at 4k7 you can turn down the voltage to approximately 3V If you want to go down to 0V you can just solder a jumper instead of a resistor in R7 If you want a higher minimum voltage then you ...

Page 6: ... by soldering the resistors and jumpers if needed Next come the diodes IC socket If needed you can create a jumper using a spare piece of lead from a resistor or diode If you want to experiment with other transistors then you could socket them instead of soldering them to the board You ll need a some 20 SIL sockets break off the sockets and solder them to the board Now is the time to solder these ...

Page 7: ...e correct pin numbering of the pots Alpha 16mm style Solder the wires accordingly and it is always a good idea to twist the wires together to create some extra shielding against external noise VR1 is labeled on the PCB with the correct pin numbers so you can use an external pot as mentioned in the power section chapter You can break off the pin I marked with the yellow circle with a small pair of ...

Page 8: ... of LED you use but 4k7 is safe enough for almost all LEDs for 9V It is now time to place your transistors and IC in the sockets if needed Connect everything build it in your enclosure and enjoy your effect The sleeve on the output jack is not connected on purpose Make sure the output jack is in good electronic contact with the enclosure else you can try and connect the sleeves of the input and ou...

Page 9: ...ore to 12 o clock and test it with different fuzz levels by turning the fuzz pot Stop when you found your sweet spot Remember that germanium transistors are very sensitive to temperature changes and will need to be re biased every now and again Fixed resistors If you have trouble biasing or just do not want it you can replace R3 with a 33k resistor and R5 with a 8k2 resistor and leave out VR2 and ...

Page 10: ...you oriented the capacitors IC s transistors and diodes the right way SMF MKT and ceramic capacitors as well as resistors do not need to be oriented A likely sign of incorrect capacitors and or orientation is when an effect is sputtering rumbling or motorboating Check if you used the correct values of the components For resistors you can look here http www diyaudioandvideo com Electronics Color Do...

Page 11: ...es are mentioned solely for circuit identification and where applicable their trademarks are the property of their respective owners who are in no way associated or affiliated with the author No cooperation or endorsement is implied 11 Schematic ...

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