Akashic Guitar effects circuit lookup
GAINLOUDTONE

1590BB · 3 knobs

Mask Audio Electronics

Helvetica 92

Based on the Electro-Harmonix Big Muff Pi· 73 other boards clone it

Category
Overdrive
Controls
Gain · Loud · Tone
Price
$9.00in stock
Buy the PCB at Mask Audio Electronics Build document Drill template

From the vendor

Originally released as a limited edition Fuzz Lab, The Helvetica 92 Overdrive is now available for all as a DIY Project. Original copy "I was talking with a friend about old big muffs and how very inconsistent they could be. Some could be gain monsters while others could be very tepid overdrives. My friend turned to me and said, I would love the most tepid big muff. That just got stuck in my head to the point where I had to make it. It turns out, with very careful parts selection you can coerce a big muff into being a perfectly usable overdrive. While the Helvetica 92 does still get fuzzy when you have the gain turned all the way up, it has some things you would never expect out of the circuit. Clarity, chime, and most importantly mid-range. Taking a familiar feel and going in a completely different Direction with it"

This one started off as a silly shower thought, can you turn the big muff into a decent overdrive? In the end the answer is kind of. I did a lot of poking and prodding and in certain ways it is very resistant to going below a certain amount of gain, but it can be modified so that you would not instantly recognize it as a big muff.

Schematic

The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 43 rows

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RefValueNormalizedTypeNotes
Resistors 24
R6470r470
R12470r470
R16470r470
R23470r470
CLR3k33.3k
R73k33.3k
R510k10k
R810k10k
R1110k10k
R1310k10k
R1710k10k
R2210k10k
R1820k20k
R1920k20k
R2100k100k
R3100k100k
R9100k100k
R14100k100k
R21100k100k
R4470k470k
R10470k470k
R15470k470k
R20470k470k
R11m1M
Capacitors 11
C6560p560p
C1010n10n
C1110n10n
C1510n10n
C1100n100n
C3100n100n
C4100n100n
C7100n100n
C121u1u
C131u1u
C14100uF100u
Diodes 1
D11n58171N5817
Transistors 4
Q139042N3904
Q239042N3904
Q339042N3904
Q439042N3904
Potentiometers 3
GAINA100kA100k
LOUDA100kA100k
TONEB100kB100k

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