PARASIT STUDIO Xor'cist User manual

The XOR'CIST
Build Document last updated june 2017
for PCB version 2.0
The Xor'cist is a glitchy and gated fuzz. But it's also a ringmodulator
with a squarewave modulation feature.
The modulation can e set to either alternate etween fuzz and
ringmod sounds or create a choppy type of on/off tremolo/stutter.
It sounds like hell...
Happy uilding and playing!

Changelog version 2.0
•Trimmed down and optimized circuit - all switches, except the
momentary one, has een removed. Most functions remains,
except the 3-way tone selector.
•Input stage redesigned to prevent oscillation issues that some
people was having.
•Input trimmer added to set the string sensitivity / alance
etween gate and sustain.
•Rate LED's are now oard-mounted – no need for a special
3PDT daughter oard.
•Dip-switch added to toggle etween latching or momentary
switch action and gated or free running LFO.
•Redesigned PCB for a easier straight forward uild.
Controls
Potentiometers
VOLUME – Controls the overall output volume
BLEND – Blends etween straight fuzz and ringmodulation
The blend pot goes from stutter fuzz (CCW) to alternating between
fuzz and ringmod, to stuttering ringmod (CW) when the modulation
is active
FREQUENCY – Sets the carrier frequency of the ringmodulation
RATE – Controls the speed of the squarewave modulation
Switches
FOOTSWITCH – This is a momentary footswitch that toggles the
stutter on or off.
The footswitch action can be either momentary or latching,
depending on the board-mounted dip-switch

General uilds tips
•Solder the low profile components first, from short to tall
height. Recommended order: resistors, diodes, IC socket, film-
caps, electrolytics, pots and switches
•CMOS chips are very sensitive to static charges and can e
easily damaged. It's a good idea to wear a anti-static
wrist and or at least avoid wearing a wool jumper and petting
your cat/dog while uilding...
•Always use sockets for IC chips and transistors to avoid
heating them directly. It also makes it much easier to swap
them out if needed.
•Pay special attention to the orientation of the diodes and
electrolytics.
•There are a LOT of switches and pots on this PCB. Be sure to
place them in the PCB without soldering first, THEN place
them in your drilled enclosure. Gently tighten the nuts to the
enclosure, then solder LAST. Otherwise, it will e really hard to
get this in your enclosure.
•This PCB's is designed for 16mm Alpha PCB mounted angeled
pots. You could also use solder lug type and just tack some
“legs” with short pieces of wire to each pot to mimic a PCB
mount type.
•The pots are meant to e mounted on the ottom (solder side)
of the oard, and soldered on the top (component side).
•The square pad represents pin 1 of each pot.
Wiring
The only thing that needs to e wired off oard (except the usual
jacks and ypass switch) is the momentary switch. Since it's a
momentary SPST switch, which connection goes to which lug on the
switch doesn't matter.
Please note If you are using the Parasit Studio 3PDT-board, you
only need to connect your DC jack to either the 9V and GND
connections on the main board or on the 3PDT-board, not to both.
For more info on how to wire up the ypass stomp switch, jacks
ect, please visit the Parasit Studio we site and download the PDF
called ”off oard wiring”. You can find it here:
http://www.parasitstudio.se/ uild-docs.html

The XOR'CIST Bill Of Materials (BOM)
•* These are current limiting resistors for the rate indicator
LED's and the modulation indicator LED. Use the appropriate
value for your LED type. I use 15K resistors in my fully
assem led uilds (with super right LED's).
•The gate trimpot sets the decay of the ringmodulation carrier
frequency gate. Set the lend fully clockwise and adjust the
trimmer to match the sustain of short notes.
•The sens trimpot sets the input string sensitivity and a alance
etween gate and sustain.
•The DIP switch has two functions. It can toggle on/off the LFO
gate and set the momentary switch action as either latching or
momentary.
•Not included in the BOM:
◦1x ypass LED
◦1x CLR (current limiting resistor) for the ypass LED
◦Also not included in the BOM ut also good to have:
enclosure, input and output jacks, LED ezels, DC jack,
3PDT ypass switch, kno s.
Resistors R19 15K* IC's
R1 1M R20 15K* U1 CD4069UBE
R2 1M Capacitors U2 CD40106BE
R3 1M C1 100nF U3 CD4070BE
R4 1M C2 2.2nF Potentiometers
R5 15K C3 4.7nF VOLUME A100K
R6 10K C4 100nF BLEND B50K
R7 100K C5 2.2uF FREQUENCY B50K
R8 100K C6 1uF RATE C50K
R9 100K C7 100nF Gate trim trimpot 100K
R10 100K C8 100nF Sensivitity trimpot 200K
R11 1M C9 100nF Switches
R12 1M C10 100uF Momentary SPST footswitch
R13 47K C11 100nF DIP-switch: 2 positions
R14 47K C12 33uF (2 switches, 4 pins)
R15 100K Diodes
R16 1M D1-D8 1N4148
R17 3.9K D9 1N4001
R18 15K* 3x LED's

Drilling template (1590BB)
•Use at your own risk! This template is approximate.
•Make sure your printer isn't doing any scaling / is set to 100%
print size.
•Drill footswitch, rec and play switches, DC jack and
input/output jacks to your own preference. There is room for
the DC jack at the top side.
•Bypass LED hole is only a suggestion (need to e wired
off oard)
•Measure and confirm efore drilling!

Schematic

Trou leshooting
There's always a chance of running into trou le. To minimize error,
follow the BOM and general uilding tips carefully. Take your time
and don't rush. Take a reak now and then. Use good solder, and it
helps to have a decent soldering station insted of a cheap iron.
If you are still having trou le, please visit the mad ean forum
Parasit Studio su forum section and ask for help there.
http://www.mad eanpedals.com/forum/index.php? oard=84.0
If you have ought the Musikding kit and have recieved a faulty or
missing component, please contact musikding directly.
https://www.musikding.de/kontakt.php?lang=eng
Terms of use
PCB's from Parasit Studio are intended for DIY use only. Commersial resale is
not allowed. It's meant for personal use, which means that it's not allowed to
uild alot of pedals and sell them for profit to strangers using pu lic forums
and craiglist ads. However, it's totally ok to uild a few pedals and sell to your
friends and andmates. After all, that's what this ho y is a out. DIY or DIE!
www.parasitstudio.se
[email protected]