Akashic Guitar effects circuit lookup
GAINGAIN TRIMPRESENCEVOLUMETREBLE CUT 3

Enclosure not stated · 5 knobs

Revolution Deux

Himmelstrutz Fetto

Based on the Himmelstrutz Fetto· 3 other boards clone it

Category
Overdrive
Controls
Gain · Gain Trim · Presence · Volume · Treble Cut 3
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadHarald Sabro (sabrotone) Vero layout

From the vendor

Himmelstrutz Elektro Art's amp-like overdrive/distortion, traced by Soulsonic (MC) with Lawnchair at freestompboxes.org. It is a JFET emulation of a tube preamp in the runoffgroove style: three cascaded JFET stages with tube-amp style coupling and bright networks, a tone section with Presence and a Mid Cut jumper, and internal jumpers and DIP switches for bass, voice, bright, gain and treble cut.

The JFETs are an unknown type: the post suggests starting with 2N5257 (probably 2N5457) and keep trying types with the right pinout until they bias up nicely. All the jumpers and DIP switches (Bass1, Bass2, Voice, Bright1, Bright2, Gain1, Gain2, Mid Cut, Treble Cut 1-3) can be brought out to the outside of the pedal for a super-adjustable overdrive.

Schematic

The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.

Parts list 43 rows

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Check before you build · 2 values the reader of this schematic was not sure of
  • The post suggests starting with '2N5257'; this is read as a typo for the 2N5457 JFET.
  • The tracer notes C16 is jumpered on the original and does not know why.
RefValueNormalizedTypeNotes
Resistors 13
R11M1Mread from the schematic by eye
R268K68kread from the schematic by eye
R312K12kread from the schematic by eye
R41K1kread from the schematic by eye
R5470K470kVoice jumper across; read from the schematic by eye
R612K12kread from the schematic by eye
R71K1kread from the schematic by eye
R8470470Gain2 jumper; read from the schematic by eye
R912K12kread from the schematic by eye
R101K1kread from the schematic by eye
R11470470Gain1 jumper; read from the schematic by eye
R1222K22kread from the schematic by eye
R1315K15kLED resistor; read from the schematic by eye
Capacitors 18
C24.7n4.7nread from the schematic by eye
C1200n200nread from the schematic by eye
C46.8n6.8nBass1 jumper; read from the schematic by eye
C32.2n2.2nread from the schematic by eye
C5470p470pread from the schematic by eye
C6220p220pBright1 DIP; read from the schematic by eye
C74.7n4.7nTreble Cut 1 DIP; read from the schematic by eye
C82.2u2.2uelectrolytic; read from the schematic by eye
C106.8n6.8nBass2 jumper; read from the schematic by eye
C92.2n2.2nread from the schematic by eye
C11470p470pBright2 DIP; read from the schematic by eye
C124.7u4.7uelectrolytic; read from the schematic by eye
C13100n100nread from the schematic by eye
C1410n10nread from the schematic by eye
C1515n15nMid Cut jumper; read from the schematic by eye
C16100n100njumpered on the original; read from the schematic by eye
C171n1nTreble Cut 2 DIP; read from the schematic by eye
C18220u220uelectrolytic; read from the schematic by eye
Diodes 2
D11N40041N4004read from the schematic by eye
D21N41481N4148read from the schematic by eye
Transistors 4
Q1JFETJFETunknown type, DGS pinout; read from the schematic by eye
Q2JFETJFETunknown type, DGS pinout; read from the schematic by eye
Q3JFETJFETunknown type, DGS pinout; read from the schematic by eye
Q4JFETJFETLED driver; read from the schematic by eye
Potentiometers 5
GainA500KA500kPotentiometerP1; read from the schematic by eye
Gain Trim500K500kPotentiometerTr1, trimmer; read from the schematic by eye
PresenceA50KA50kPotentiometerP2; read from the schematic by eye
VolumeA100KA100kPotentiometerP3; read from the schematic by eye
Treble Cut 3100K100kPotentiometerTr2, trimmer; read from the schematic by eye
LEDs 1
D3blue LEDBLUE LEDread from the schematic by eye

Other boards based on the Himmelstrutz Fetto