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Kraken
FX Type: Envelope Filter
© 2013 madbeanpedals
06.13 – see pg.4 for a correction
2.15" W x 1.66" H
Kraken PCBs purchased from madbeanpedals, or etched from the included artwork, may
be used for small amounts of commercial building without prior consent. Keep in mind
that quantity discounts are not offered on PCBs. The use of the PCBs for resale or as
part of "kits" is strictly forbidden.
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Related Manuals for madbeanpedals Kraken
Summary of Contents for madbeanpedals Kraken
- Page 1 Kraken FX Type: Envelope Filter © 2013 madbeanpedals 06.13 – see pg.4 for a correction 2.15” W x 1.66” H Kraken PCBs purchased from madbeanpedals, or etched from the included artwork, may be used for small amounts of commercial building without prior consent. Keep in mind that quantity discounts are not offered on PCBs. The use of the PCBs for resale or as part of “kits” is strictly forbidden.
- Page 3 B.O.M. Resistors Caps Diodes R1 100k C1 100n D1, D2 1n914 R2 100k C2 100pF D3 1N4001 R3 10k C3 47n Transistors R4 330R C4 33n Q1 2N5089 R5 47k C5 2n2 Q2 2N5087 R6 6k8 C6 1n8 Q3 2N5089 R7 22k ...
- Page 4 Overview The Kraken is a modified Mutron Micro V™ envelope filter. The Mutron Micro V™ is the “little brother” of the more fully featured Mutron III™ having only a Range pot and a Hi/Low switch for the filtering. The Kraken expands the controls to include Attack and Decay for the envelope response. This is the only alteration to this classic and great sounding envelope! Controls Range: This controls the intensity of the envelope dynamics generated by your pick attack. Higher settings yield greater sensitivity, which in turn drives the intensity of the swept filter. Attack: This control lets you dial in finer adjustments to the attack of the envelope. It is interactive with the Range pot. Decay: This control determines how long it takes for the envelope to sweep the filter. Higher settings yield longer decay times. Hi/Lo: This switch controls the range of the filter that is swept. Hi is thin and resonant. Lo is full and dark. Mods Try a pair of diodes with lower forward voltage for D1 and D2. This may improve sensitivity to picking dynamics. You can use 1n34a, BAT41 or BAT46. Try a higher value pot for the Decay control for even longer decay times. Suggestions are 250kB or 500kB. Notes You can use 16mm short pin PCB mounted pots for the Attack, Range and Decay controls. http://www.smallbearelec.com/servlet/Detail?no=692 While other ICs may work for IC2, I strongly suggest sticking with the LM1458. It seems to handle envelope controls pretty well. You can probably use a 4558 in a pinch. I would avoid the TL072 and similar JFET based opamps. 06.13.13 – Q2 was drawn incorrectly on the schematic (collector and emitter were swapped). The schematic on pg.2 has been corrected to show the correct orientation. You should flip Q2 180° on the PCB (on both the fabbed and single sided versions), however this is not critical: I have confirmed the filter works the same either way. Thanks for the catch, Scruffie!
- Page 5 1590B Drill Template (fabbed PCB) 4.64” W x 6.69” H This template is approximate.
- Page 6 Wiring Pads 3 and 6 of the Hi Lo switch are not wired to anything.
- Page 7 Single Sided Layout 2.10”W x 1.85”H R18 (the LED current limiting resistor) is not present in the single sided layout.
- Page 8 1590B Drill Template (Single Sided PCB) 4.64” W x 6.69” H This template is approximate.
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