Akashic Guitar effects circuit lookup
DRIVEBASSTONEVOLUMEMIDSBRIGHTCLIP

1590BB · 7 knobs

From the vendor

Included is the Tube Nightmare PCB and the 3PDT (footswitch) PCB.

The idea for the Tube Nightmare came about as I was looking at various existing Tube Screamer diy PCBs that were available and trying to decide which one to make. There were several mods that were of interest, but the existing builds could only accommodate one or two at the same time. I then decided to embrace the fears of option paralysis and summoned the Tube Nightmare.

There are a few options that one could alter on this build which I'll detail below. If built with the stock parts list in the Bill of Materials this is a Tube Screamer with the following mods:

- Wider Gain Rage - From clean to high gain. - Bass Knob - Increases low end into the circuit pre-gain and as a result increases gain as well. - Clip Switch - 3 clipping options (symmetrical silicon, asymmetrical silicon, and no diodes) - Mids Switch - Decreases the signature mid hump. Depending on other settings this can be fairly subtle. This also decreases gain a bit. - Bright Switch - The stock setting rolls off a lot of high end. This allows you to bring some back with two brighter options.

The traditional Gain, Tone, and Volume knobs are there as well.

For stock Screamer tones, all switches should be up and the bass knob should be all the way down.

OTHER OPTIONS, IF YOU WANT THEM:

- BRIGHT SWITCH - I've included room for an additional capacitor to allow the brightness to be potentially fine tuned when switched to the down position. C10 can be omitted, or socketed for experimentation. See additional notes in the Bill of Materials. To be honest, I initially thought I might prefer it less bright, but now think I prefer C10 omitted. Find out for yourself if you're curious.

- CLIPPING - I kept the clipping pretty straight forward, but feel free to socket the diodes and experiment. Diodes D5 and D6 are the stock silicon pair, so it might make more sense to experiment with D2, D3, and D4. One possible version that could be cool would be to use LEDs in D2 and D3 and then jump D4 with wire.

BUILD INFO:

I didn't want to offer full kits, but I also know that parts sourcing can be daunting if you're not accustomed to it. For this reason in the Bill of Materials I have included color coded links for every part needed by placing orders with Love My Switches and Tayda. Most of the parts I recommend getting from Love My Switches you may be able to find less expensively from other brands and sources, but from my experience these are items where you definitely get what you pay for and it's worth buying better quality for less headaches and a sturdier build.

ENCLOSURES:

The awesome folks at OBSCURA MFG are offering enclosures that are professionally drilled, powder coated, and printed. They look amazing, and will save you time and potential headaches. Not to mention you’ll end up with a fully professional looking build.

Purchase The Obscura MFG Enclosure Here

The Obscura enclosure has the LED hole drilled out to the specs of the Tayda bezel in the Bill of Materials. If you are ordering the Obscura enclosure and will not be ordering parts from Tayda, I can provide a bezel at no additional charge. To receive this bezel, please use the note field when checking out and write something along the lines of "INCLUDE BEZEL FOR OBSCURA ENCLOSURE."

** If you don't pick up an Obscura enclosure, don't forget to get a 1590BB in your order from Tayda or Love My Switches, etc.

Schematic

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

Parts list 53 rows

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RefValueNormalizedTypeNotes
Resistors 21
R11K1kbuy all needed resistors at this link - the minimum quantity of each value is 10, so just buy 10 of each: 47 OHM // 100 OHM // 220 OHM // 1 K // 4.7 K // 10 K // 47 K // 510 K // 2.2 M
R2220220OHM
R3510K510k
R410K10k
R510K10k
R610K10k
R72.2M2.2M
R810K10k
R910K10k
R101K1k
R1110K10k
R12510K510k
R131K1k
R1410K10k
R151K1k
R16100100OHM
CLR4.7K4.7k
R174747OHM
R1847K47k
R1910K10k
R201K1k
Capacitors 15
C122nf22nFILM[ Total quantity of 1 is needed of this value ]
C2220nf220nFILM[ Total quantity of 3 is needed of this value ]
C31uf1uFILM[ Total quantity of 4 is needed of this value ]
C4220nf220nFILM[ included in the quantity listed above ]
C51uf1uFILM[ included in the quantity listed above ]
C61uf1uFILM[ included in the quantity listed above ]
C747uf47uELECTROLYTIC[ Total quantity of 1 is needed of this value ]
C810uf10uELECTROLYTIC[ Total quantity of 1 is needed of this value ]
C9220nf220nFILM[ included in the quantity listed above ]
C11100nf100nFILM[ Total quantity of 3 is needed of this value ]
C121uf1uFILM[ included in the quantity listed above ]
C13100nf100nFILM[ included in the quantity listed above ]
C1410nf10nFILM[ Total quantity of 1 is needed of this value ]
C1547pf47pCERAMIC[ Total quantity of 1 is needed of this value ]
C16100nf100nFILM[ included in the quantity listed above ]
Diodes 6
D11N58171N5817
D21N9141N914[ You may want to socket D2 - D6 clipping diodes to try different diodes like LEDs or 1N4148 etc. ]
D31N9141N914
D41N9141N914
D51N9141N914
D61N9141N914
Transistors 2
Q12N50882N5088[ Socketing transistors is recommended unless you are 100% certain of orientation and using a heat sink ]
Q22N50882N5088[ Socketing transistors is recommended unless you are 100% certain of orientation and using a heat sink ]
ICs 1
IC1LM4558NLM4558N[ Socket IC with 8 PIN SOCKET - link in misc. section below ]
Potentiometers 4
DRIVEA500KA500k16MM POTENTIOMETER
BASSB20KB20k16MM POTENTIOMETER
TONEW20kW20k16MM POTENTIOMETER
VOLUMEA100KA100k16MM POTENTIOMETERTayda is currently out of stock of this model, but has an alternate you'll need to purchase a dust seal cover for ->
Switches 3
MidsSPDTSPDTON / ON TOGGLE SWITCHI highly recommend these Taiway switches from lovemyswitches.com but Tayda has switches available too.
BrightSPDTSPDTON / OFF / ON TOGGLE SWITCHI highly recommend these Taiway switches from lovemyswitches.com but Tayda has switches available too.
ClipSPDTSPDTON / OFF / ON TOGGLE SWITCHI highly recommend these Taiway switches from lovemyswitches.com but Tayda has switches available too.
Jacks & sockets 1
C10OMIT OR SOCKET [ for brightness fine tuning ]OMIT OR SOCKET [ FOR BRIGHTNESS FINE TUNING ][ This Capacitor is included in case you find the bright switch too bright. Larger values will be less bright. Anywhere from 10nf to 100nf could work, though I would expect a middle ground of 47nf to be a good start https://www.taydaelectronics.com/47nf-0-047uf-100v-5-polyester-film-box-type-capacitor.html

Other boards based on the Ibanez Tube Screamer