A large online repository or library of guitar pedal schematics, layouts, PCB transfers, and tagboard layouts. All rights reserved to respective owner(s) - not for profit / for educational purposes ONLY.
Big Muff Vero Layout / Big Muff Pi / Russian Green Big Muff
EHX Green Russian Big Muff
Big Muff Pi - Ram's Head Version , REV 2
Big Muff 1977 Opamp Version
NYC Big Muff
Big Muff Pi with Tone wicker switch
Keeley 4 Knob Compressor
BOM:
| Group | Value |
Tot
Qty |
| Resistors | 1K |
2
|
| Resistors | 10K |
7
|
| Resistors | 15K |
1
|
| Resistors | 27K |
2
|
| Resistors | 56K |
1
|
| Resistors | 150K |
1
|
| Resistors | 220K |
2
|
| Resistors | 470K |
2
|
| Resistors | 1M |
4
|
| Resistors | 4M7 |
1
|
| Capacitors | 150p |
1
|
| Capacitors | 1n |
1
|
| Capacitors | 2n2 |
1
|
| Capacitors | 10n |
5
|
| Capacitors | 47n |
1
|
| Capacitors | 1u |
6
|
| Capacitors | 10u |
2
|
| Diodes | 1N4148 |
2
|
| Transistors | 2N5088 |
5
|
| IC | CA3080 |
1
|
Modify a EH Soul Food - Bass Contour and Diode Mods - Klon Clone
Here an italian forum member from (jamble.it) does some modifications to the EH Soul Food , a pretty good sounding "klon clone".
These mods include Bass Contour , and Germanium Diode switch mods. The Germanium diodes found in the original Klon are vintage 1N34A diodes, or their russian equivalent the D9E.
In general, the improvement (soundwise) is subtle. And at its best at moderate to full gain.
The mods explained below are not my mods.
The board is SMD based. It is very easy to damage this board by applying the mods below. And it is difficult to de-solder components without applying to much heat if you don’t have the right tools or experience
Diode Mod: locate the Schottky-diodes below the tone pot on the backside of the pcb.
De solder the diodes using a copper desoldering wick or desolder tool.
Gently pull out the diodes using a small screwdriver first to widen the gap between the board and the original diode.(while applying moderate heat). finally clear the remaining solder holes.
Now you can replace the diodes with the diodes of choice or connect it to a diode switching board (i.e.Guitar PCB).
Note there is not much room on the left side. See my modification to mount the diode switch below the buffer switch.(you also need to adjust the 3dtp switch for more room to accommodate the diode switch board).As an alternative , you can solder the diodes direct to the switch (Search for examples on the internet).
These are derived from the JHS mods originally done to this pedal.
These mods include Bass Contour , and Germanium Diode switch mods. The Germanium diodes found in the original Klon are vintage 1N34A diodes, or their russian equivalent the D9E.
In general, the improvement (soundwise) is subtle. And at its best at moderate to full gain.
The mods explained below are not my mods.
The board is SMD based. It is very easy to damage this board by applying the mods below. And it is difficult to de-solder components without applying to much heat if you don’t have the right tools or experience
Procedure:
Removing the EHX Nano knobs:
First I learned a hard lesson to apply even vertical force when removing the EHX Nano size knobs.
The best way to do it is gently heating the knobs using a hair dryer, and put two spoons or shoe laces to force\pull the knob from the pot shaft.
Be careful here, you can easily rip the shaft out of the original pots. (At least I did) See picture.
Disassemble the board (the adapter input and the switchboard connector are easily damaged).
Removing the EHX Nano knobs:
First I learned a hard lesson to apply even vertical force when removing the EHX Nano size knobs.
The best way to do it is gently heating the knobs using a hair dryer, and put two spoons or shoe laces to force\pull the knob from the pot shaft.
Be careful here, you can easily rip the shaft out of the original pots. (At least I did) See picture.
Disassemble the board (the adapter input and the switchboard connector are easily damaged).
Diode Mod: locate the Schottky-diodes below the tone pot on the backside of the pcb.
De solder the diodes using a copper desoldering wick or desolder tool.
Gently pull out the diodes using a small screwdriver first to widen the gap between the board and the original diode.(while applying moderate heat). finally clear the remaining solder holes.
Now you can replace the diodes with the diodes of choice or connect it to a diode switching board (i.e.Guitar PCB).
Note there is not much room on the left side. See my modification to mount the diode switch below the buffer switch.(you also need to adjust the 3dtp switch for more room to accommodate the diode switch board).As an alternative , you can solder the diodes direct to the switch (Search for examples on the internet).
Diode Switch prepped (silicon one side, germanium on the other)
Switch is a DPDT on/off/on but you can use on/on.
(with diodes bypassed, this pedal becomes more of a boost and EQ)
Diodes removed , wiring goes back to D3
Silicon Diode / Germanium Switch
50K Lin Pot in series w/ 47nF Cap
[ you can try 47nF, 68nF, 100nf, 150nF, or even 1uF ]
Diode switch and Bass Contour Cap location (c9)
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