Transmute8 PCB (Eurorack)
Manufacturer: antilog devices
Product ID: P-EUR-04
The main board for the analog expander. Processes and scales incoming CV from the DAC and distributes it to the panel PCB.
Weight: 20 grams
in stock - expected to ship in 2 days on Oct 21
14.98 €
incl. VAT, excl. shipping
add to cart
Bill of Materials / Placement Guide
Label
Package
Name
Part Link
1R26
SMT 1206
50k 1%
1R34
SMT 1206
50k 1%
1R42
SMT 1206
50k 1%
2R27
SMT 1206
50k 1%
2R35
SMT 1206
50k 1%
2R43
SMT 1206
50k 1%
3R28
SMT 1206
50k 1%
3R36
SMT 1206
50k 1%
3R44
SMT 1206
50k 1%
4R29
SMT 1206
50k 1%
4R37
SMT 1206
50k 1%
4R45
SMT 1206
50k 1%
5R30
SMT 1206
50k 1%
5R38
SMT 1206
50k 1%
5R46
SMT 1206
50k 1%
6R31
SMT 1206
50k 1%
6R39
SMT 1206
50k 1%
6R47
SMT 1206
50k 1%
7R32
SMT 1206
50k 1%
7R40
SMT 1206
50k 1%
7R48
SMT 1206
50k 1%
8R33
SMT 1206
50k 1%
8R41
SMT 1206
50k 1%
8R49
SMT 1206
50k 1%
C1
SMT 1206
100n
C2
SMT 1206
100n
C3
E2,5-5
10uF
C4
E2,5-5
10uF
C5
SMT 1206
100n
C6
SMT 1206
100n
C7
SMT 1206
100n
C8
SMT 1206
100n
C9
SMT 1206
100n
C10
SMT 1206
100n
C11
SMT 1206
100n
C12
SMT 1206
100n
C13
SMT 1206
100n
C14
SMT 1206
10p
C15
SMT 1206
10p
C16
SMT 1206
10p
C17
SMT 1206
10p
C18
SMT 1206
10p
C19
SMT 1206
10p
C20
SMT 1206
10p
C21
SMT 1206
10p
C22
SMT 1206
10p
C23
SMT 1206
10p
C24
SMT 1206
10p
C25
SMT 1206
10p
C26
SMT 1206
10p
C27
SMT 1206
10p
C28
SMT 1206
10p
C29
SMT 1206
10p
IC1
SMT SO14
TL074D
IC2
SMT SO14
TL074D
IC3
SMT SO14
TL074D
IC4
SMT SO14
TL074D
J1
2x5 header
PINHD-2X5EURO
J2
1x04 socket
1X4 socket
J3
1x08 socket
1X8 socket
J4
1x11 socket
PINHD-1X11SOCKET
L1
5mm
bead
L2
5mm
bead
R1
SMT 1206
1k
R2
SMT 1206
50k 1%
R3
SMT 1206
50k 1%
R4
SMT 1206
50k 1%
R5
SMT 1206
50k 1%
R6
SMT 1206
50k 1%
R7
SMT 1206
50k 1%
R8
SMT 1206
50k 1%
R9
SMT 1206
50k 1%
R10
SMT 1206
130k
R11
SMT 1206
130k
R12
SMT 1206
130k
R13
SMT 1206
130k
R14
SMT 1206
130k
R15
SMT 1206
130k
R16
SMT 1206
130k
R17
SMT 1206
130k
R18
SMT 1206
100k
R19
SMT 1206
100k
R20
SMT 1206
100k
R21
SMT 1206
100k
R22
SMT 1206
100k
R23
SMT 1206
100k
R24
SMT 1206
100k
R25
SMT 1206
100k
R50
SMT 1206
220R
R51
SMT 1206
220R
R52
SMT 1206
220R
R53
SMT 1206
220R
R54
SMT 1206
220R
R55
SMT 1206
220R
R56
SMT 1206
220R
R57
SMT 1206
220R
VR1
25 turn
50k
VR2
25 turn
50k
VR3
25 turn
50k
VR4
25 turn
50k
VR5
25 turn
50k
VR6
25 turn
50k
VR7
25 turn
50k
VR8
25 turn
50k
VREF1
LM4040* 5.0V
5.0V
Required Mouser parts
Can be directly transferred into your mouser cart by copying & pasting the text below into the mouser part list import tool (you may need to log in at mouser before the tool is available):
https://www.mouser.com/tools/part-list-import.aspx
603-RT1206FRE0749K9L|40
80-C1206C104M5R|11
667-ECA-1HM100I|2
77-VJ1206A100JXQCBC|16
511-TL074IYDT|4
517-929836-01-36-RK|1
517-974-01-04-RK|1
517-929974-01-08-RK|1
517-929974-01-11-RK|1
81-BL01RN1A1F1J|2
652-CR1206-JW-102ELF|1
652-CR1206JW-134ELF|8
652-CR1206JW-104ELF|8
652-CR1206JW-221ELF|8
81-PV36W503C01B00|8
595-LM4040A50IDBZR|1
The BOM checker 'bot says:
All parts referenced from the CAD master files have been validated. The BOM should be safe to order!*
* Disclaimer: although we have taken the best care possible, we cannot guarantee 100% accuracy and we cannot be held liable for erroneous orders when using this tool, including (but not limited to) incorrect quantities and/or types of components ordered through midiphy or other suppliers.
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Tech Notes
Using a digital multimeter, match the resistance values of resistor groups 1RXX, 2RXX, 3RXX etc. - the exact value is unimportant. No need to match the values between groups 1RXX-8RXX.


Resistors 1R34, 2R35...8R41 add an offset for the respective channel. Thus it is possible to configure unipolar output channels by omitting these. You could create a board with e.g. half bipolar, half unipolar output channels. Considering the tuning range of typical VCOs, bipolar CVs make the most sense. But there might be applications where unipolar voltage output (0V ~ 10V) is helpful.


Caution: if you are using unipolar output, the corresponding LED resistors on the octal PCB should be changed to suit the higher voltage range; here we'd recommend 2k2 resistors for R1-R8 on the octal PCB.

Tip: you could use a different LED color on octal to indicate the unipolar channels.

Left image: Scaling circuit for the transmute8 board. The incoming CV is scaled with the first op amp and linear V/oct tuning is adjusted with VR1-8. The second op amp re-inverts the signal and adds an offset (optional). It is best if the summing and feedback resistors are closely matched to mitigate errors.

Both inverting amplifiers have simple filters. The 10p capacitor values could be optimized further. The final output is a compensated protection circuit typically seen in Eurorack modules.

The circuits are repeated with sequential component numbering for channels 3-8.
To calibrate, use a digital multimeter to measure the output in volts of the respective CV output port.

Within the SEQ v4+, first check, that you are using "AOUT" as a hardware protocol (rightmost encoder on the right screen in the CV Options menu). Also in the CV Options menu, choose CV1 (leftmost encoder on the left screen) and use the second encoder from the right (still on the left screen) to choose a calibration voltage of 5V, which would correspond to a C3 note, as the Transmute8 has an output offset of -5V. Here, we would aim for a reading of 0.000V on the multimeter.

Now use the hardware trimpot on the Transmute8 of this channel to adjust to get a readout close to 0.000V on the multimeter.

Now you can use the rightmost encoder on the left v4+ screen to fine-tune adjustment offsets (linear software interpolation!) for every volt in the range -4V to +5V (display-voltage 1V - 10V because of the -5V offset).

As the trimpot calibrates the slope of the amplification, not much tuning is possible at the -5V output voltage point. In the left diagram we are aiming to reach the blue line. Every other voltage step other than -5V can be fine tuned to quite precisely match a full volt. Most important are the voltages between -2V to 2V, as these span the "five center octaves" around C3 (0V output). Thus the SEQ v4+ allows to span an "interpolation net" of 9 voltage offsets, that allow to adjust any linearity issues of the DAC. Normally not much adjustment should be needed (offsets in the range -20 to +20).

You could also watch the calibration chapter in the DIY midiphy SEQ V4+ Eurorack Expansion Modules build tutorial video.