Enclosure not stated · 5 knobs
Catalinbread DLS MKIIIVerified
Based on the Catalinbread Dirty Little Secret Mk. III· 4 other boards clone it
- Category
- Distortion
- 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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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×5 | 1M | 1M | read from the layout by eye | |
| ×4 | 1K | 1k | read from the layout by eye | |
| ×3 | 470K | 470k | read from the layout by eye | |
| ×2 | 2M2 | 2.2M | read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×1 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 680R | 680 | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| Capacitors 14 | ||||
| ×4 | 22n | 22n | read from the layout by eye | |
| ×4 | 470p | 470p | read from the layout by eye | |
| ×2 | 680n | 680n | read from the layout by eye | |
| ×2 | 220n | 220n | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×1 | 270p | 270p | read from the layout by eye | |
| ×1 | 220p | 220p | read from the layout by eye | |
| ×1 | 47p | 47p | read from the layout by eye | |
| ×1 | 2n2 | 2.2n | read from the layout by eye | |
| ×1 | 1n | 1n | read from the layout by eye | |
| ×2 | 2u2 | 2.2u | electrolytic; read from the layout by eye | |
| ×2 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22u | 22u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N5817 | 1N5817 | read from the layout by eye | |
| D2 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | MPF4393 | MPF4393 | JFET; legend: try J201, 2N5457 etc; read from the layout by eye | |
| Q2 | MPF4393 | MPF4393 | JFET; legend: try J201, 2N5457 etc; read from the layout by eye | |
| Q3 | MPF4393 | MPF4393 | JFET; legend: try J201, 2N5457 etc; read from the layout by eye | |
| Q4 | MPF4393 | MPF4393 | JFET; legend: try J201, 2N5457 etc; read from the layout by eye | |
| Q5 | MPF4393 | MPF4393 | JFET; legend: try J201, 2N5457 etc; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | ICL7660SCPA | ICL7660SCPA | charge pump; read from the layout by eye | |
| Potentiometers 5 | ||||
| Pre-Gain | A1M | A1M | Potentiometer | read from the layout by eye |
| Treble | B250K | B250k | Potentiometer | read from the layout by eye |
| Bass | A1M | A1M | Potentiometer | read from the layout by eye |
| Mids | B25K | B25k | Potentiometer | read from the layout by eye |
| Volume | B250K | B250k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| Presence | 10K | 10k | read from the layout by eye | |
| Switches 4 | ||||
| Sw1 | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Sw2 | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Sw3 | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |
| VSw | SPDT on/on | SPDT ON/ON | toggle, 9V or 18V supply; read from the layout by eye | |
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