MIDI/CV Convert 140 Build Guide
Assembly Instructions
The MIDI to CV 140 module has no particular build requirements not already covered in the ‘General Build Info' page.
Calibration
Initially adjust Pr1 to give 4.266V at the junction of R1 & R4
Pr1 can be fine adjusted using a MIDI keyboard to give a 1V increment for each note pressed 1 octave higher than the previous
PCB Parts List
| Part Number | Quantity | Value | Name | RefDes |
| 7212-768 | 7 | 100n | 100n MLCC Capacitor | C1, C3, C7, C10, C11, C12, C14 |
| 7213-110 | 3 | 100u | 100uF 25V Electrolytic | C2, C15, C16 |
| 7212-770 | 1 | 470n | 470n MLCC Capacitor | C4 |
| 7212-774 | 1 | 1n | 1n MLCC Capacitor | C5 |
| 7212-731 | 4 | 22p | 22p MLCC Capacitor | C6, C8, C9, C13 |
| 7212-486 | 1 | 1N914 | D1 | |
| 7213-925 | 1 | LED - Orange | D2 | |
| 7212-240 | 2 | 3.5mm Stereo Jack | J1, J2 | |
| 1208-005 | 1 | Flex Strip 5way | J3 | |
| 7212-301 | 1 | Eurorack | Eurorack Power | J4 |
| Pot 100k Lin PCB Angle* | P1 | |||
| 7212-855 | 1 | 2k | 2k Preset 25T 3296W | Pr1 |
| 7163-039 | 1 | 330R | 330R 0.25W 1% Metal Film Resistor | R1 |
| 7163-051 | 3 | 1k | 1k 0.25W 1% Metal Film Resistor | R2, R15, R18 |
| 7163-035 | 4 | 220R | 220R 0.25W 1% Metal Film Resistor | R3, R5, R6, R9 |
| 7163-075 | 2 | 10k | 10k 0.25W 1% Metal Film Resistor | R4, R14 |
| 7163-078 | 1 | 13k | 13k 0.25W 1% Metal Film Resistor | R7 |
| 7163-057 | 1 | 1k8 | 1k8 0.25W 1% Metal Film Resistor | R8 |
| 2000-105 | 2 | 15k 0.1% | 15k 0.25W 0.1% Metal Film Resistor | R10, R17 |
| 7163-007 | 2 | 10R | 10R 0.25W 1% Metal Film Resistor | R11, R13 |
| 2000-095 | 2 | 10k 0.1% | 10k 0.25W 0.1% Metal Film Resistor | R12, R16 |
| 7212-250 | 1 | SPDT | S1 | |
| 7212-251 | 2 | SPDT CO | S2, S4 | |
| SR16A Rotary Switch* | S3 | |||
| 2230-011 | 1 | 5V | 78L05 | U1 |
| 7212-521 | 1 | 40106B | U2 | |
| 7212-586 | 1 | 6N139N | U3 | |
| 2230-302 | 1 | TL431CLP | U4 | |
| 7212-604 | 1 | ATMEGA328P-PU | ATMEGA328P-PU | U5 |
| 7212-543 | 1 | TL072BCP | U6 | |
| 2254-012 | 1 | MCP4922 | U7 | |
| 2121-161 | 1 | 16MHz | 16MHz Crystal | Xtal1 |
*See below for MOTM or MU Switches / Potentiometers
Module Parts List
| Description | Reference |
MOTM Qty |
MU Qty |
| Pot Sticky Pads | 7210-188 | 1 | 1 |
| 10mm M4 Spacers | 7210-186 | 4 | 4 |
| M4 x 14 Cap Head Screws | 7210-187 | 4 | 4 |
| M3 x 8mm Stainless Panel Screws | 7216-151 | 4 | 4 |
| LED Spacer | 7210-185 | 1 | 1 |
| 8-Pin IC Socket | 7212-331 | 2 | 2 |
| 14-Pin IC Socket | 7212-332 | 2 | 2 |
| 28-Pin IC Socket | 7212-338 | 1 | 1 |
| Power Lead | 7216-164 | 1 | |
| M²Synth MU / MOTM Voltage Regulator / Interface | 7216-170 | 1 | |
| Toggle Switch Dress Nut | 7210-196 | 3 | 3 |
| MOTM Front Panel | 7216-540 | 1 | |
| MOTM Back Panel | 7216-840 | 1 | |
| MU Front and Back Panel | 7219-540 | 1 | |
| Main PCB | 7216-040 | 1 | 1 |
| Jack Socket PCB | 7215-722 | 1 | 1 |
| Jack Sockets | 7212-220 | 4 | 4 |
| B100k Pots Long shaft - Angle | 7300-820 | 1 | |
| B100k Pots Short shaft - Angle | 7300-821 | 1 | |
| 8-Way Rotary Switch Long Shaft | 1612-027 | 1 | |
| 8-Way Rotary Switch Short Shaft | 1612-026 | 1 | |
| KM20B Knobs | 7212-170 | 1 | |
| MU Knobs | 7212-169 | 1 | |
| Circuit Schematic | S-7216-040-c | 1 | 1 |
PCB Layout
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