Music Thing Modular TH-VCO1 Manual

TH-VCO1
Build Instructions (detailed)
This is a detailed build instruction for
Rev 1.0 of the TH-VCO1, based on the
Eurorack Adaption by Tom Whitwell by
Music Thing Modular and the original
Circuit by Thomas Henry. Boards and
Panel were designed by David Huss in
the course of a synthesizer workshop at
HFBK Hamburg.
The TH-VCO1 is a stable and wide range
Oscillator with three different wave-
forms, two FM-inputs and CV-controlla-
ble Pulsewidth. The Panel is 10 HP wide
(50.50 mm) and the VCO uses max 55mA
on ±12V.
To build this module some basic tools
are needed: soldering iron, solder, cut-
ting pliers, at pliers, multimeter, cutter
Make sure to to be concentrated on de-
tails. Some parts can look very similar
and should not be confused with each
other! Searching for errors afterwards
takes far more energy than doing it right
from the start.
More details (BOM, Manual, Calibration
Manual) and other projects can be found
under <https://code.hfbk.net/t6/sdiy/
wikis/home>

Step 1
Split PCBs with a
cutter and the edge
of a table.
Do not attempt to
break it appart with-
out putting it to an
edge!

Step 2
On components PCB:
solder all 10k resis-
tors (6 pieces) in.
Careful not to con-
fuse them with 18k!
6x Resistor
10k

Step 3
On components PCB:
solder all 18k resis-
tors (2 pieces) in.
Careful not to con-
fuse them with 10k!
2x Resistor
18k

Step 4
On components PCB:
solder all 12k resis-
tors (2 pieces) in.
2x Resistor
12k

Step 5
On components PCB:
solder all 2.2k resis-
tors (3 pieces) in.
Do not confuse with
2.2m or 22k!
3x Resistor
2.2k

Step 6
On components PCB:
solder all 100k resis-
tors (2 pieces) in.
2x Resistor
100k

Step 7
On components PCB:
solder all 2.2M resis-
tors (2 pieces) in.
2x Resistor
2.2M

Step 8
On components PCB:
solder R36 with 150k in (re-
place this with a different
value to change PWM con-
trol scale, leave this out and
add a 200k precision trim-
mer if you want to add the
PWM Scale Trim Mod)
1x Resistor
150k

Step 9
On components PCB:
solder R10 with 1M
1x Resistor
1M

Step 10
On components PCB:
solder R1 with 1k
1x Resistor
1k

Step 11
On components PCB:
solder R16 with 20k
1x Resistor
20k

Step 12
On components PCB:
solder R9 with 22k
1x Resistor
22k

Step 13
On components PCB:
solder R15 with 27k
1x Resistor
27k

Step 14
On components PCB:
solder R24 with 390R
1x Resistor
390R

Step 15
On components PCB:
solder R7 with 47R
1x Resistor
47R

Step 16
On components PCB:
solder R18 with 5.1k
1x Resistor
5.1k

Step 17
On components PCB:
solder R8 with 820R
1x Resistor
820R

Step 18
On components PCB:
solder R2 with 2k.
If you intend to use
matched transistors in-
stead of the THAT340
chip, do not solder your 2K
3300ppm tempco in yet but
after soldering the transis-
tors. All three parts need
to be in thermal contact
which can be achieved
by glueing them together
with either expoxy or cy-
anacrylate.
1x Resistor
2K

Step 19
On components PCB:
solder the two 1N4001
diodes in.
Careful with the ori-
entation! The white
stripe needs to be
oriented into the right
direction as indicated
on the silkscreen
2x Diodes
1N4001