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GAINVOLUME

125B · 2 knobs

Aion FX

DryadTransparent Overdrive

Based on the Catalinbread Silver Kiss

Category
Overdrive
Controls
Gain · Volume
Difficulty
Easy
Price
$12.50in stock
Buy the PCB at Aion FX Build document1.0.0 (2023-11-24) Mouser parts spreadsheet googleTracing Journal link

From the vendor

A stripped-down Tube Screamer circuit with an active 3-band EQ which provides amp-like control over the tone.

The Dryad Transparent Overdrive is based on the Catalinbread Silver Kiss, originally released in 2007 and traced by Aion FX in 2023. There were at least five different versions of the circuit, but this project is based on the Mk. 2, which was the most widely available.

The Silver Kiss is a stripped-down Tube Screamer-style overdrive, not dissimilar in concept to the Jack Orman Son of Screamer or the Lovepedal Eternity. The major departure is the addition of an active 3-band tone control, which offers a significant amount of tone-shaping.

As with the Timmy, the Silver Kiss doesn’t color the tone with a lot of its own character, instead bringing out the best of your rig but allowing for high degree of control before it hits the amp.

The Dryad is a direct adaptation of the Silver Kiss Mk. 2 based on our trace.

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 45 rows

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RefValueNormalizedTypeNotes
Resistors 16
R11M1MMetal film resistor, 1/4W
R21k1kMetal film resistor, 1/4W
R31k1kMetal film resistor, 1/4W
R42k22.2kMetal film resistor, 1/4W
R52k22.2kMetal film resistor, 1/4W
R62k22.2kMetal film resistor, 1/4W
R71k1kMetal film resistor, 1/4W
R82k22.2kMetal film resistor, 1/4W
R92k22.2kMetal film resistor, 1/4W
R102k22.2kMetal film resistor, 1/4W
R112k22.2kMetal film resistor, 1/4W
R12100k100kMetal film resistor, 1/4W
R13100k100kMetal film resistor, 1/4W
R1447R47Metal film resistor, 1/4WPower supply filter resistor.
RPD2M22.2MMetal film resistor, 1/4WInput pulldown resistor. Can be as low as 1M.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 13
C147n47nFilm capacitor, 7.2 x 2.5mm
C2200pF200pMLCC capacitor, NP0/C0G
C3220n220nFilm capacitor, 7.2 x 2.5mm
C4100n100nFilm capacitor, 7.2 x 2.5mm
C51uF1uFilm capacitor, 7.2 x 3.5mmCan omit and use 4.7uF tantalum for C6. See build notes.
C747n47nFilm capacitor, 7.2 x 2.5mm
C822n22nFilm capacitor, 7.2 x 2.5mm
C947n47nFilm capacitor, 7.2 x 2.5mm
C1047n47nFilm capacitor, 7.2 x 2.5mm
C111uF1uFilm capacitor, 7.2 x 3.5mmCan omit and use 4.7uF tantalum for C12. See build notes.
C1347uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C14100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C15100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 3
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
ICs 1
IC1TL072TL072Operational amplifier, dual, DIP8
Potentiometers 5
GAIN100kAA100k16mm right-angle PCB mount potAudio (log) taper.
BASS50kBB50k16mm right-angle PCB mount potLinear taper.
MID50kBB50k16mm right-angle PCB mount potLinear taper.
TREBLE100kBB100k16mm right-angle PCB mount potLinear taper.
VOLUME10kBB10k16mm right-angle PCB mount potLinear taper.
Switches 1
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
Jacks & sockets 4
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountLumberg NEB/J 21 C or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.