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PROJECT NAME
MAELSTROM
BASED ON
®
Darkglass
Microtubes B3K
EFFECT TYPE
Bass overdrive / distortion
PROJECT SUMMARY
A CMOS-flavored bass overdrive with tones spanning across decades, from vintage warmth to modern
bite and aggression.
Actual size is 2.3" x 2.61" (main board) and 1.78" x 0.86" (bypass board).
MAELSTROM BASS DRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2021-11-12)
1
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Summary of Contents for aion MAELSTROM
- Page 1 Bass overdrive / distortion 1.0.0 (2021-11-12) PROJECT SUMMARY A CMOS-flavored bass overdrive with tones spanning across decades, from vintage warmth to modern bite and aggression. Actual size is 2.3” x 2.61” (main board) and 1.78” x 0.86” (bypass board). MAELSTROM BASS DRIVE...
- Page 2 “Era”. The Maelstrom is a direct adaptation of the Microtubes B3K, with the Era control ported over from the Vintage Microtubes. With the Era control turned down, it’s identical to the standard B3K. You can also make some more parts substitutions to build it to full Vintage Microtubes specs if you’d like.
- Page 3 Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W 100R Metal film resistor, 1/4W Metal film resistor, 1/4W Input pulldown resistor. LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. MAELSTROM BASS DRIVE...
- Page 4 SMD version of the J201. TL072 Operational amplifier, DIP8 IC1-S DIP-8 socket IC socket, DIP-8 TL072 Operational amplifier, DIP8 IC2-S DIP-8 socket IC socket, DIP-8 CD4049UBE CMOS hex inverting buffer, DIP16 IC3-S DIP-16 socket IC socket, DIP-16 MAELSTROM BASS DRIVE...
- Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. MAELSTROM BASS DRIVE...
- Page 6 330k 220pF The only other addition is a 220n capacitor in series with R15. The Maelstrom PCB does not include space for this capacitor. It can be omitted entirely (the unit will have slightly more bass available). Or, you can “tent” it with the resistor by putting one leg of the capacitor in one pad of R15, one leg of the resistor in the other pad, and then soldering the leads together above the PCB.
- Page 7 IC3E CD4049UBE IC3F CD4049UBE 220n GRUNT J201 IC2A TL072P 200k 470k IC1A 220pF J201 100k TL072P ATTACK 330k 220n 22pF GND GND 22pF 470k IC1B TL072P 680pF IC3A IC2B TL072P 100kB CD4049UBE 100k IC4A TL072P IC4B TL072P MAELSTROM BASS DRIVE...
- Page 8 +0.65, y: +1.71 ø9/32” ø9/32” GRUNT ATTACK BLEND x: 0, y: +0.83 ø1/4” x: -0.65, y: +0.41 x: +0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” MAELSTROM BASS DRIVE...
- Page 9 ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B MAELSTROM BASS DRIVE...
- Page 10 WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B MAELSTROM BASS DRIVE...
- Page 11 (In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.0 (2021-11-12) Initial release. MAELSTROM BASS DRIVE...
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