1590BB · 3 knobs
Helvetica 92
Based on the EHX Big Muff· 7 other boards clone it
- Category
- Overdrive
- Controls
- Gain · Loud · Tone
- Price
- $9.00in stock
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
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 24 | ||||
| R6 | 470r | 470 | ||
| R12 | 470r | 470 | ||
| R16 | 470r | 470 | ||
| R23 | 470r | 470 | ||
| CLR | 3k3 | 3.3k | ||
| R7 | 3k3 | 3.3k | ||
| R5 | 10k | 10k | ||
| R8 | 10k | 10k | ||
| R11 | 10k | 10k | ||
| R13 | 10k | 10k | ||
| R17 | 10k | 10k | ||
| R22 | 10k | 10k | ||
| R18 | 20k | 20k | ||
| R19 | 20k | 20k | ||
| R2 | 100k | 100k | ||
| R3 | 100k | 100k | ||
| R9 | 100k | 100k | ||
| R14 | 100k | 100k | ||
| R21 | 100k | 100k | ||
| R4 | 470k | 470k | ||
| R10 | 470k | 470k | ||
| R15 | 470k | 470k | ||
| R20 | 470k | 470k | ||
| R1 | 1m | 1M | ||
| Capacitors 11 | ||||
| C6 | 560p | 560p | ||
| C10 | 10n | 10n | ||
| C11 | 10n | 10n | ||
| C15 | 10n | 10n | ||
| C1 | 100n | 100n | ||
| C3 | 100n | 100n | ||
| C4 | 100n | 100n | ||
| C7 | 100n | 100n | ||
| C12 | 1u | 1u | ||
| C13 | 1u | 1u | ||
| C14 | 100uF | 100u | ||
| Diodes 1 | ||||
| D1 | 1n5817 | 1N5817 | ||
| Transistors 4 | ||||
| Q1 | 3904 | 3904 | ||
| Q2 | 3904 | 3904 | ||
| Q3 | 3904 | 3904 | ||
| Q4 | 3904 | 3904 | ||
| Potentiometers 3 | ||||
| GAIN | A100k | A100k | ||
| LOUD | A100k | A100k | ||
| TONE | B100k | B100k | ||
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