PARASIT STUDIO 0415 GUITAR SYNTH User manual

0415 Guitar Synth
Build Document last updated may 2020
for PCB version 2.0
The 0415 Guitar Synth is a fun a simple pedal that transforms the
signal into a s uare wave, up to four octaves apart: one or two
octaves up can be mixed with one or two octaves down for super
synthy sounds.
This circuit works best with high output pickups (although I had
decent results with single coils aswell). It is a gated circuit by
nature of the schmitt trigger that turns the signal into a
s uarewave. If you are using single coils and need more sustain,
try a boost or compressor in front. To tighten up the octave
tracking, use your neck pickup with the tone rolled off.
Happy playing!

Update 2020-05-14
It's come to my attention that several people has been trouble
getting the octave up switch working recently.
The PCB has been verified and built succesfully by many many people, but this
sudden trouble with the octave up may be caused by a manufacturing issue on
the latest run of boards.
Luckey, there's a simple fix to get it working. :)
•Omit/remove R14 and R15 from the PCB and put links there
instead (you can use a cutoff component leg)
•Omit/remove R13 from the PCB aswell – but don't put a link
there.
•Solder a short link between the (now empty) top hole for R13
to the top hole/leg of R17 (the resistor next to R13, to the
right).
Even if this shows an unpopulated board, all other components except R 3,
R 4 and R 5 should be installed as normal. The blue lines are the 3 links that
needs to be soldered in.

Changelog version 2.0
•CV input added
•Tracking slightly improved
•Both switches changed to on/off/on types for two new
features:
◦Octave down switch middle position: Fundamental note
◦Octave up switch middle position: Detuned upper octave
Controls
•SWITCHES:
•OctDown – Toggles between one octave down,
fundamental note, or two octaves down
•OctUp – Toggles between on octave up, a detuned mode
(in between on and two octaves), or two octaves up
•MIX: Blends between octave down and octave up
•VOLUME: Controls the overall volume
eneral builds 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 be
easily damaged. It's a good idea to wear a anti-static
wristband or at least avoid wearing a wool jumper and petting
your cat/dog while building...
•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.
•All PCB's are designed for 16mm Alpha PCB mount 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 s uare pad represents pin 1 of each pot.
•Both pots and switches are meant to be mounted on the
backside (the solder side) of the PCB and soldered from the
front side (component side).

Bill Of Materials (BOM)
•** = see page two!
•The trimmer sets the input sensitivity, from very sensitive and
noisy when just touching the strings to more gated and
controlled. Adjust to suite your guitar output and taste.
•* = Current limiting resistor for the LED. This needs to be
wired offboard or on a 3PDT board. Choose the appropriate
value for the type of LED you are using. A 4.7K resistor is
usually a good value for a regular diffused LED and 15K
resistor for a superbright clear LED.
•Other things that are not included in the BOM but good to
have: enclosure, input and output jacks, DC jack, 3PDT switch,
LED bezel and knobs.
Wiring
For more info on how to wire up the stompswitch, jacks ect, please
visit the Parasit Studio website and download the PDF called
”offboard wiring”. You can find it here:
http://www.parasitstudio.se/build-docs.html
Resistors R16 10K IC's
R1 1M R17 10K IC1 CD4069UBE
R2 1M R18 47K IC2 CD4015BE
R3 1M R19 47K IC3 CD4046BE
R4 1M R20 100K
R5 10K Capacitors Potentiometers
R6 10K C1 100nF MIX B50K
R7 10K C2 4.7nF VOLUME A100K
R8 4.7K C3 100nF TRIMPOT 200K
R9 100K C4 33nF Switches
R10 100K C5 470pF OctDown DPDT on/off/on
R11 47K C6 100nF OctUp SPDT on/off/on
R12 47K C7 - Diodes
R13 10K** C8 2.2uF D1 1N4001
R14 10K** C9 100uF on/off LED x1
R15 10K** C10 2.2nF + 1x CLR*

CV input (optional)
The CV input lets you hook up an external Low Fre uency S uare
Wave Oscillator (LFO) that will modulate the upper octave for crazy
sounds. The CV input can also trigger the PLL chip synthesis, so you
can use it as a noise maker without any guitar connected to the
input.
It works well with a wide range of voltages, so try connecting the
LFO output frpm a synthesizer, modular system or the Parasit
Studio New Wave CV Generator.
CV jack Wiring
To hook up the CV (control voltage) input jack, connect the CV pad
on the PCB to the tip of a 3.5mm jack (or jack of your choice).
Make sure that the sleeve of your jack is connected to ground (it
usually is connected to ground via the enclosure unless you have an
isolated jack type). If you use a stereo/balanced jack, just leave the
ring lug unconnected.

Drilling template (1590B)
•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, DC jack and input/output jacks to your own
preference.
•Measure and confirm before drilling!

Schematic

Troubleshooting
There's always a chance of running into trouble. To minimize error,
follow the BOM and general building tips carefully. Take your time
and don't rush. Take a break 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 trouble, please visit the madbean forum
Parasit Studio subforum section and ask for help there.
http://www.madbeanpedals.com/forum/index.php?board=84.0
If you have bought 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
build alot of pedals and sell them for profit to strangers using public forums
and craiglist ads. However, it's totally ok to build a few pedals and sell to your
friends and bandmates. After all, that's what this hobby is about. DIY or DIE!
www.parasitstudio.se
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