Akashic Guitar effects circuit lookup
PRE-GAINTREBLEBASSMIDSVOLUME

Enclosure not stated · 5 knobs

Tagboard Effects

Catalinbread DLS MKIIIVerified

Based on the Catalinbread Dirty Little Secret Mk. III· 4 other boards clone it

Category
Distortion
Controls
Pre-Gain · Treble · Bass · Mids · Volume
Build
Vero· 21×19· 28 cuts, 4 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Catalinbread, Charge pump, Distortion, Overdrive

From the post

I didn't think it would end up too big, so I thought I'd jump straight in at the deep end and do a modified version with additional 9V/18V switching and the components switching done with individual toggles rather than a single 4PDT switch, which allows you to turn the selections on and off independently.

If you want it exactly like the original, you can omit the charge pump and associated components and take 9V directly to where VSw 3 connects to the board. Then use a 4PDT toggle instead of two SPDT and one DPDT for switches 1 to 3.

Info about Catalinbread's original:

Introducing the new Dirty Little Secret from Catalinbread. The Dirty Little Secret has earned itself a well-deserved reputation for replicating the sound and feel of a classic era Marshall amplifier, supplying one of the most iconic guitar sounds in music. Able to clean up with a flick of your guitar's volume control, or go from mild crunch to full kerrang with your pick attack, the Dirty Little Secret has seen the inside of arenas and bedrooms alike, providing great overdriven sounds to clean backlines, low-wattage amps, and even direct applications. When the JFETs used as the base for the Dirty Little Secret were discontinued, and as our stock of them began to dwindle we knew we had to find ones still being manufactured. However, rather than simply re-voicing around these new JFETs, we decided to push the envelope and provide an amazingly robust feature-set, from ever evolving listening and circuit skills, and pure power of intention. This isn't just 'a' Marshall in a box, it's the most versatile and dynamic Marshall-style overdrive out there!

What's new in the Dirty Little Secret:

• The DLS now offers two distinct voicings, "Super Lead" and "Super Bass" switchable via an internal slider switch.

• Completely redesigned full three-knob treble-middle-bass tone control complement that reconfigures for each mode setting.

• We've also added an internal presence trimmer that allows you to fine-tune the presence of the pedal precisely to your guitar and amp combination.

• The gain range is much wider and even more responsive to pickup types, playing dynamics and instrument volume knob!

The "Super Lead" mode expands the range of the DLS MkII with more gain available and more control over your tone sculpting with the addition of the midrange control without losing any of the touch-sensitive dynamic qualities that made the MkII so great to play - in fact, those qualities have been enhanced. The gain range now goes from classic plexi all the way to modified JCM800 levels and can get even more raw and open than any previous DLS. This mode was voiced specifically to make humbucker-equipped guitars really rock with clean to scream all from the twist of your guitar's volume knob.

The "Super Bass" mode is a new voicing that gives you the tone and gain structure of a Marshall Super Bass (which is very similar to a JTM45 or JTM50/100). This mode was voiced to really hone in on that elusi

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 42 rows

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RefValueNormalizedTypeNotes
Resistors 10
×51M1Mread from the layout by eye
×41K1kread from the layout by eye
×3470K470kread from the layout by eye
×22M22.2Mread from the layout by eye
×233K33kread from the layout by eye
×14K74.7kread from the layout by eye
×156K56kread from the layout by eye
×1100K100kread from the layout by eye
×1680R680read from the layout by eye
×147K47kread from the layout by eye
Capacitors 14
×422n22nread from the layout by eye
×4470p470pread from the layout by eye
×2680n680nread from the layout by eye
×2220n220nread from the layout by eye
×1100n100nread from the layout by eye
×1270p270pread from the layout by eye
×1220p220pread from the layout by eye
×147p47pread from the layout by eye
×12n22.2nread from the layout by eye
×11n1nread from the layout by eye
×22u22.2uelectrolytic; read from the layout by eye
×247u47uelectrolytic; read from the layout by eye
×110u10uelectrolytic; read from the layout by eye
×122u22uelectrolytic; read from the layout by eye
Diodes 2
D11N58171N5817read from the layout by eye
D21N58171N5817read from the layout by eye
Transistors 5
Q1MPF4393MPF4393JFET; legend: try J201, 2N5457 etc; read from the layout by eye
Q2MPF4393MPF4393JFET; legend: try J201, 2N5457 etc; read from the layout by eye
Q3MPF4393MPF4393JFET; legend: try J201, 2N5457 etc; read from the layout by eye
Q4MPF4393MPF4393JFET; legend: try J201, 2N5457 etc; read from the layout by eye
Q5MPF4393MPF4393JFET; legend: try J201, 2N5457 etc; read from the layout by eye
ICs 1
×1ICL7660SCPAICL7660SCPAcharge pump; read from the layout by eye
Potentiometers 5
Pre-GainA1MA1MPotentiometerread from the layout by eye
TrebleB250KB250kPotentiometerread from the layout by eye
BassA1MA1MPotentiometerread from the layout by eye
MidsB25KB25kPotentiometerread from the layout by eye
VolumeB250KB250kPotentiometerread from the layout by eye
Trimmers 1
Presence10K10kread from the layout by eye
Switches 4
Sw1SPDT on/onSPDT ON/ONtoggle; read from the layout by eye
Sw2SPDT on/onSPDT ON/ONtoggle; read from the layout by eye
Sw3DPDT on/onDPDT ON/ONtoggle; read from the layout by eye
VSwSPDT on/onSPDT ON/ONtoggle, 9V or 18V supply; read from the layout by eye

Other boards based on the Catalinbread Dirty Little Secret Mk. III