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GAINBASSTONEVOLUME

Enclosure not stated · 4 knobs

Revolution Deux

Wampler Ecstasy / Euphoria Overdrive

Based on the Wampler Ecstasy· 4 other boards clone it

Category
Overdrive
Controls
Gain · Bass · Tone · Volume
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadTagboard Effects vero layout

From the vendor

Wampler's Ecstasy, later renamed the Euphoria, a Dumble-flavored overdrive. The post calls it a Tube Screamer / Voodoo Labs Overdrive hybrid: an op-amp gain stage whose Bass control is a pot to a big cap in the ground leg (the same bass control as PaulC's Timmy), a three-way switch choosing feedback diodes, diodes to 4.5V, or no diodes (op-amp clipping), then a second gain stage and a variable low-pass treble control. Brian Wampler described the design himself on freestompboxes.

The schematic is a simulation screen grab: the three separate 4.5V voltage dividers (R7/R11, R12/R13, R14/R15) can be replaced by a single divider feeding every 4.5V point.

Schematic

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

Parts list 39 rows

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Fixes to the schematic, from the post

  • The two 12.5k resistors labeled TONE1 and TONE2 in the output filter are really a 25k pot, with its wiper going to the 22n cap C2.
  • The op-amp (U1 and U5 on the drawing) is a JRC4580D.
Check before you build · 1 value the reader of this schematic was not sure of
  • The switch wiring is drawn only as two 'Switch' labels; it is a three-position toggle (feedback diodes / none / diodes to 4.5V).
RefValueNormalizedTypeNotes
Resistors 15
R147K47kread from the schematic by eye
R21M1Mread from the schematic by eye
R310K10kread from the schematic by eye
R41K1kread from the schematic by eye
R5470K470kread from the schematic by eye
R6470K470kread from the schematic by eye
R7100K100k4.5V divider; read from the schematic by eye
R833K33kread from the schematic by eye
R91K1kread from the schematic by eye
R11100K100k4.5V divider; read from the schematic by eye
R1247K47k4.5V divider; read from the schematic by eye
R1347K47k4.5V divider; read from the schematic by eye
R14100K100k4.5V divider; read from the schematic by eye
R15100K100k4.5V divider; read from the schematic by eye
R2247K47kread from the schematic by eye
Capacitors 12
C12.2u2.2uread from the schematic by eye
C222n22nread from the schematic by eye
C347n47nread from the schematic by eye
C4100p100pread from the schematic by eye
C52.2u2.2uread from the schematic by eye
C6100p100pread from the schematic by eye
C722n22nread from the schematic by eye
C101u1uread from the schematic by eye
C1110u10uelectrolytic; read from the schematic by eye
C1210u10uelectrolytic; read from the schematic by eye
C1310u10uelectrolytic; read from the schematic by eye
C20100p100pread from the schematic by eye
Diodes 6
D11N41481N4148read from the schematic by eye
D21N41481N4148read from the schematic by eye
D31N41481N4148read from the schematic by eye
D41N41481N4148read from the schematic by eye
D51N41481N4148read from the schematic by eye
D61N41481N4148read from the schematic by eye
ICs 1
U1JRC4580DJRC4580Ddrawn as two generic op-amps U1 and U5; the post says it is a JRC4580D; read from the schematic by eye
Potentiometers 4
Gain1M1MPotentiometerread from the schematic by eye
Bass10K10kPotentiometerread from the schematic by eye
Tone25K25kPotentiometerdrawn as two 12.5k resistors (TONE1, TONE2); the post says it is a 25k pot. Treble control; read from the schematic by eye
Volume100K100kPotentiometerread from the schematic by eye
Switches 1
Clipping switch3-way toggle3-WAY TOGGLEfeedback diodes / none / diodes to 4.5V; read from the schematic by eye

Other boards based on the Wampler Ecstasy