flight of harmony Parasite Antifilter User manual

WTF eurorack module v1
kit

PAR-K v1.0 manual Dec. 2022 — p.1/16 www.ightofharmony.com
Contents
(1) Front panel
(5) PCB - Control, Switch, Jack, Main, Rear
(3) Resistor card
(1) Semiconductor card
(1) Capacitor card
(1) Hardware bag
(1) 2x5 box header
(4) M3x0.5 eurorack mounting screw
(4) M3 nylon washer
(6) 3/8" locking PCB standoff
(2) 1/2" locking PCB standoff
(2) 1x3 0.1" pitch 0.235" height pin header (HDRSWFBM, HDRSWG1M)
(1) 1x9 0.1" pitch 0.318" head x 0.235" tail pin header (HDRMJR)
(1) 1x12 0.1" pitch 0.318" head x 0.235" tail pin header (HDRMJL)
(1) 1x7 0.1" pitch 0.310" head x 0.318" tail pin header (HDRMPR)
(1) 1x13 0.1" pitch 0.310" head x 0.318" tail pin header (HDRMPL)
(1) 1x3 0.1" pitch 0.620" head x 0.110" tail pin header (HDRSWG2R)
(3) 1x3 0.1" pitch machined socket header (HDRSWFB, HDRSWG1, HDRSWG2)
(1) 1x5 0.1" pitch machined socket header (HDRPR)
(1) 1x7 0.1" pitch machined socket header (HDRRPR)
(2) 1x9 0.1" pitch machined socket header (HDRJR, HDRRJR)
(2) 1x12 0.1" pitch machined socket header (HDRJL, HDRRJL)
(2) 1x13 0.1" pitch machined socket header (HDRPL, HDRRPL)
(1) Power cable bag
(1) 9" 10-conductor 0.050" pitch ribbon cable
(1) 10-pin IDC socket connector
(1) 16-pin IDC socket connector
(1) Potentiometer bag
(1) Potentiometer, A100k
(10) Potentiometer, B100k
(11) M7 Washer
(11) M7 Nut
(11) M7 Knob
(1) Jack bag
(13) M6 3.5mm TS jack
(13) M6 Washer
(13) M6 Nut
(1) Switch bag
(3) SPDT (Single-Pole, Double-Throw) toggle switch with nut
(3) 10-40 hex nut
(3) #10 star internal-tooth lock washer
(1) Reference manual (this thing)
(1) Owner's manual (that other thing like this thing)

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Kit Notes
Tools
• Soldering iron with ne tip
• Solder
• Fine-tip tweezers
• Nut drivers/sockets/wrenches:
• 7mm (toggle switch)
• 8mm (jack nuts)
• 10mm (potentiometer nuts)
Skills
This kit assumes that you have a basic understanding of electronics, electronic
components, and soldering and assembling electronics. Note that this kit is almost
entirely Surface Mount Technology (SMT), so the assumption is that you understand
how to work with Surface Mount Devices (SMD) and have some experience.
This doesn't mean that you're completely on your own, just that I'm not going
to hold your hand1. Below are a few things to help get you started. Feel free to
ignore them.
Assembly Tips
• RTFM2! All the way through!
• For the smaller SMD, use the smallest soldering iron tip that you have. My
favorite is the Weller ETR: (Not an endorsement, nor do I get anything from it,
it's just a good reference point.) Remember to switch back to a larger tip when
soldering the through-hole components and the regulators.
• Good, ne-tip tweezers are a must. The Wiha 4b and 7a tweezers are great3.
• One helpful trick for soldering SMD with wire solder is to pre-solder one pad
for each component location. Next, hold the component in place and touch
your soldering iron tip to the pre-soldered pad to reow the solder. Then you
can solder the other side normally.
1) For many reasons, but two in particular: First, I'd have to leave my house, and I hate doing that.
Second, it's really hard to solder with only one hand.
2) Read The F***ing Manual! This thing!
3) IMO, their 5abb were the best, but they discontinued them so FML. No, you can't have mine.
Narrow Screwdriver
Cat
. A B C
No.
in. mm in. mm in. mm
ETR
0.062 1.60 0.044 1.12 0.625 15.90
A
B
C

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Kit Notes (cont.)
• Flux is your friend. Use ux. Water-soluble ux is best for a clean
nish, but you have to make sure to get it all off when done, as
it can corrode the joint and some uxes may also be capacitive.
NOTE: The potentiometers and switches are NOT sealed and cannot be
submerged; so don't wash them. You can also use no-clean ux.
• Smallest rst. Solder the components in increasing order of size. Per board,
per side, not overall.
• Minimize heat exposure. Heat destroys components, and SMD are particularly
sensitive because they have less mass to distribute the heat. Flux helps with
this too.
• Use the face plate to line up the potentiometers, jacks, and LEDs, before
soldering; this is much easier than resoldering them to line them up correctly
afterward.
Assembly Order
The easiest build order is as follows:
1. All SMD, smallest rst.
2. Install & solder all the headers on the Control, Jack, and Rear PCBs.
3. Install & solder the pin headers on the Main PCB - see instructions below.
4. Install & solder the potentiometers and jacks.
5. Attach the panel - see toggle switch jam nut instructions on p. 15.
Main PCB Pin Headers
The HDRMJL, HDRMJR, HDRMPL, and HDRMPR headers are used in an
atypical fashion, so pay careful attention to these parts. They engage with socket
headers on both sides so they extend through the Main PCB, and require special
care when installing and soldering. To repeat: pay close attention! Incorrect
soldering can cause the posts to not t in the sockets, and putting them in incorrectly
is extremely difcult to repair. To install:
1. Identify each header and where it goes. There are two different headers:
the longer — HDRMPL & HDRMPR, with 0.310" head x 0.318" tail—
mate with the Control PCB (g. 1).
0.310"
0.318"
g. 1: HDRMPL & HDRMPR
header pin (to scale).

PAR-K v1.0 manual Dec. 2022 — p.4/16 www.ightofharmony.com
Kit Notes (cont.)
2. The shorter headers — HDRMJL & HDRMJR, with 0.318" head x 0.235"
tail — mate with the jack PCB (g. 2).
3. On both types of headers the long end goes through the PCB. This
technically means HDRMJL & HDRMJR are installed upside down,
but don't worry about it, it'll be ne4— see the Exploded View and
Subassembly View diagrams for visual references. Install the headers and
use the Control and Jack PCBs to hold them in place during soldering.
For soldering, it is important to try to keep the solder at the junction of the
pin and the rear side of the PCB. Large soldering iron tips or too much heat will
cause the solder to wick up the length of the pin, which can make the pin too
thick to t into its corresponding socket. A sharp, narrow soldering iron tip and
thin wire solder helps prevent this. If you do end up with a blob of solder that
impedes assembly, you can usually remove it with desoldering braid and a broad-
tip soldering iron.
Film Capacitors
The plastic lm box capacitors, C22 and C55, need to be laid over to one
side to t between the PCBs (see diagram on p. 14). Bend the legs 90° and install
the capacitors so they rest on top of the adjacent chip resistors and capacitors.
As shown in the Rear PCB Assembled View on p. 6, C22 should be oriented to
the top of the PCB, and C55 should be oriented toward the bottom of its PCB for
best clearance.
Help
If you're still having problems, email me! I am always happy to help. When
emailing, please include high-resolution pictures of your circuit boards.
Most of the troubleshooting requests I have received were solved by zooming
in and closely examining the pictures. Cold solder joints are sneaky and hard to
spot if you haven't dealt with them before. A cold solder joint is where the solder
doesn't adhere to both the pad and the component lead, and just owed around
one of them without making contact. They happen, and they suck, but they're easy
xes once you nd them.
4) It actually will be ne. The small risers on the bottom side of most headers is to allow clearance for
solvents, ux, and solder in automated assembly and cleaning processes, and have little-to-no impact
on hand assembly. I mean sure, you could always prove me wrong, but that's not very nice.
0.318"
0.235"
g. 2: HDRMJL & HDRMJR
header pin (to scale).

PAR-K v1.0 manual Dec. 2022 — p.5/16 www.ightofharmony.com
Control, Jack, & Main PCB Assembled Views

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Rear PCB Assembled View

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Main PCB SMD Reference

PAR-K v1.0 manual Dec. 2022 — p.8/16 www.ightofharmony.com
Rear PCB SMD Reference

PAR-K v1.0 manual Dec. 2022 — p.9/16 www.ightofharmony.com
Exploded View
HDRMJR HDRMJL
HDRMPR
HDRMPL
HDRSWG2R
HDRPR
HDRRPR
HDRSWG2
HDRSWG1
HDRSWFB
HDRRJR
HDRJR
HDRRJL
HDRJL
HDRRPL
HDRPL
HDRMJL, HDRMJR, HDRML, and HDRMPR have
long side toward PCB.
HDRSWFBM
HDRSWG1M
3/8” 9.5mm
3/8” 9.5mm
3/8” 9.5mm
1/2” 12.7mm

PAR-K v1.0 manual Dec. 2022 — p.10/16 www.ightofharmony.com
Exploded View (cont.)
HDRMJR HDRMJL
HDRMPR
HDRMPL
HDRSWG2R
HDRPR
HDRRPR
HDRSWG2
HDRSWG1
HDRSWFB
HDRRJR
HDRJR
HDRRJL
HDRJL
HDRRPL
HDRPL
HDRMJL, HDRMJR, HDRML, and HDRMPR have
long side toward PCB.
HDRSWFBM
HDRSWG1M
3/8” 9.5mm
3/8” 9.5mm
3/8” 9.5mm
1/2” 12.7mm

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Note relative nal heights.
Subassembly View

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Note relative nal heights.
Subassembly View (cont.)

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Power Cable Assembly
Triangle indicates
location of red stripe.

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IC Orientation
Diode Orientation
Film capacitor Installation
Miscellaneous
(OR) LINE
Pin 1
Line/Slope
Line/Slope
90°

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Spin ush with panel.
Spin ush with panel,
do not tighten.
Tighten gently with
nut driver/wrench/socket.
Tightening toggle switch jam nuts.
Toggle switches are slightly shorter than the jacks and potentiometers, so the
jam nut (rear nut) must be run ush with the panel before tightening the outer nut
to prevent deforming the panel.
Miscellaneous (cont.)

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