Mutable Instruments Anushri Manuale utente
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 1 of 23https://mutable-instruments.net/archive/anushri/build/
Anushri - Assembly
instructions
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 2 of 23https://mutable-instruments.net/archive/anushri/build/
Anushri is made of two circuit boards. The first board (main board) is holding the power supply, the
whole analog synthesis signal chain, the MIDI interface and the main processor. The second board
(control board) contains all the controls (switches, pots, LEDs, and connectors). A consequence of
that is that builders with a love for panel-mounted controls can build the main board and just wire all
the controls to it. We don’t recommend that unless you have some insane passion to show.
SCHEMATICS AND PCB
Main board schematics in PDF format.
Control board schematics in PDF format.
Main board top and bottom part placement.
Control board part placement.
You can find the Eagle files for this board in the source code hosted on github.
BILL OF MATERIALS
Bill of Materials.
Some friendly notes for the self-sourcing crowd:
Digikey resistor values might be a bit different due to strict adherence to the E-series. This is not a
problem.
A J112 can be used as a substitute for the 2N5458. A BF245 can also be used, but it needs to be
mounted backwards because of a different pinout.
The TS912 is an unusual - but justified here - choice of op-amp. Look for +/- 5V operation and true rail
to rail I/O if you want to source a substitute.
Voltage references (LM4040) are available in different precision grades identified by letters A, B, C, D.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
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For integration into a modular setup and precise CV in/out, it is recommended to use the A or B grades.
C grade is fine for standalone use.
If pots with center-detent are hard to find, you can use a standard part. When it matters, the software
scanning the pot will still apply a “virtual notch” to the center of the pot.
BUILDING FOR EURORACK
If you want to build Anushri as an Eurorack module:
Do not solder the input/output connectors at the back of the unit (MIDI, audio IN/OUT, on/off switch, DC
power).
Do not insert the LT1054 DC-DC converter in its socket.
Solder a 2x5 power connector (-12V, ground, ground, ground, +12V) on the edge of the main board.
The rack-mounting kit contains a spare panel that can be used to relocate the MIDI I/O and the
6.35mm audio output to the front panel.
ASSEMBLY INSTRUCTIONS
Some equipment you’ll need:
1. Soldering iron + solder (nothing fancy, a 15 or 20W will do).
2. Cutters.
We assume you know soldering. If you don’t, look first at this tutorial.
**DISCLAIMER: ** We are not responsible for anything wrong (including electric shocks,
malfunctions, fires, accidents involving a soldering iron) that might happen during the assembly of
the kit. Everything you do while assembling the kit is at your own risks.
Resistors
The assembly starts with the main board.
All resistors have a 1% tolerance so their last ring is always brown (if it isn’t, you are looking at it
backwards). It is recommended to test the value of one resistor from each strip before stuffing them
in the board.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
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Start with the 100’s decade:
4x 220R resistors (red, red, black, black) at positions R1, R3, R4, R13.
11x 470R resistors (yellow, purple, black, black) at positions R5, R6, R9, R10, R21, R22, R27, R51,
R55, R57, R62.
The 1k’s decade:
7x 4.7k resistors (yellow, purple, black, brown) at positions R25, R38, R39, R45, R50, R52, R53.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 5 of 23https://mutable-instruments.net/archive/anushri/build/
The 10k’s decade:
9x 10k (brown, black, black, red) at positions R2, R29, R37, R49, R63, R64, R70, R73, R77.
1x 12k (brown, red, black, red) at position R28.
3x 15k (brown, green, black, red) at positions R18, R30, R35.
10x 22k (red, red, black, red) at positions R11, R14, R23, R26, R36, R40, R43, R44, R46, R47.
1x 27k (red, purple, black, red) at position R72.
9x 33k (orange, orange, black, red) at positions R12, R16, R17, R19, R20, R24, R31, R54, R67.
1x 39k (orange, white, black, red) at position R71.
1x 49.9k (yellow, white, white, red) at position R68.
1x 62k (blue, red, black, red) at position R66.
2x 68k (blue, grey, black, red) at positions R56, R59.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 6 of 23https://mutable-instruments.net/archive/anushri/build/
The 100k’s decade:
9x 100k (brown, black, black, orange) at positions R7, R8, R33, R34, R41, R42, R48, R60, R61.
1x 150k (brown, green, black, orange) at position R32.
4x 200k (red, black, black, orange) at positions R15, R58, R65, R69.
Diodes
Diodes are polarized, and their polarity is indicated by a ring. This should match the ring/stripe
printed on the circuit board.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 7 of 23https://mutable-instruments.net/archive/anushri/build/
3x 1N4148 (1N4148 printed on the body of the diode) at positions D1, D5, D6.
2x 3.6V Zener (1N5227B or BZX79 C3V6) at positions D3 and D4.
1x 1N400x (large, power supply protection diode) at position D2. 1N4001, 1N4002, 1N4003, 1N4004
only differ by their current/voltage ratings, all are fine for this project.
You can also add at this stage the quartz crystal at position Q3. It is not polarized.
Ceramic capacitors
Ceramic capacitors look like yellow or blue “drops”. They are not polarized.
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
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2x 10pF (100) at positions C20, C51.
2x 18pF (180) at positions C54, C55.
1x 100pF (101) at position C12.
5x 560pF (561) at positions C8, C17, C30, C32, C35.
33x 100nF (104).
IC sockets
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 9 of 23https://mutable-instruments.net/archive/anushri/build/
Add the IC sockets. It is strongly recommended to align the notch of the IC socket with the notch on
the symbol printed on the PCB.
9x DIP8.
3x DIP14.
7x DIP16.
1x DIP28.
Transistors, special resistors and capacitors
1/17/18, 8'04 AMMutable Instruments | Anushri - Assembly instructions
Page 10 of 23https://mutable-instruments.net/archive/anushri/build/
Add:
3x trimmers. The adjustment screws should be on the same side as on the symbol printed on the
board.
3x LM4040 voltage references, 1x 2N3906 transistor and 1x 2N5485. Check the symbol printed on the
board for their alignment.
1x 22nF film capacitor (C4).
2x 220pF styroflex capacitor (C14, C28).
1x 2.2nF styroflex capacitor (C9). You can solder it to pins 1 3 (leaving the middle pin) or to pins to 2 3
(leaving the left pin) depending on the size of the part. See the image below.
1x 1.6 10k resistor network. See the image below for orientation: the dot on the resistor network should
be on the same side as the 1printed on the board.
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