The tone controls are interesting - not a huge amount of value added to the sound. I might have to give linear pots a try, as quite a bit happens in towards the end of the range. Might also try the two knob version, to see how different that is.
In terms of sound, it sits somewhere between distortion and fuzz, but not firmly with one or the other (at least the one I made sounds this way).
MONTARBO SINPHOTON - POINT TO POINT LAYOUT
NOTE: needs power filtering if you plan to run off a power supply. Quiet on a battery, I had a fair bit of noise on my power supply without filtering. Try the usual 100ohm resistor / 100uf capacitor combination. There's maybe just enough room to sneak it on this layout.
MONTARBO SINPHOTON - SUGGESTED MODS
I haven't tried all of these yet, so I can't vouch for any of them. They're all listed here on Guitar FX layouts.
- 100nf cap to ground on the input to increase compression / focus
- Try a LED for the diode on the bottom right - said to make a big difference
- Remove or tweak the 100k resistor across the Q1 diodes to increase / decease fuzz (maybe even try a pot or a switch) remove = more fuzz, increase = less fuzz
- Check bias on Q1 / Q2 collectors, may need to reduce
- Change 2.2uf caps to 10uf (as seen on the later version)
- Change the 47k resistor to ground to a B25k pot, in series with a 180k resistor - said to be a fuzz control
MONTARBO SINPHOTON - VERO LAYOUT
MONTARBO SINPHOTON SCHEMATIC
There's a few schematics out there - all the same topology, just some variations in a resistor here and there, the odd capacitor change.
COLLECTOR Q1
Input signal: sine wave, 440hz, approx 130mv TRMS
Transistors are vintage silicon NEC C959
Diodes are silicon 1S1588
COLLECTOR Q2
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