ER-PROTO-01
Contents
Features
- Eurorack Prototyping card set
- 6 HP wide (30mm) front panel
- 3U tall
- Three card set
- Board interconnect headers duplicated on headers
- 30mm wide front panel
- 28mm wide panel and daughtercards
- 6 POTS
- Marked as RV1-RV5
- Series resistors on pot wiper
- All 3 pot pins brought to top header
- 4 Jacks
- Marked as J1-J4
- Tip/sleeve brought to header near middle/bottom
- Pots on top, jacks on bottom of card
- Easier to adjust pots without bumping into pots
- Pots more often accessed than jacks
- Large prototyping area
- 58 nodes with 3 holes per node (29 per "side")
- +12V, -12V down board edges
- 5V/GND down center of card
- Bussed connections horizontally
- Front Panel with generic labels
- Cover with White on Black P-Touch labels
Connectors
- J1-J4 are front panel connectors
Inter-card Connectors
Pots
- J5 on the Controls card and J5 on the I/O card
- Pot connections
- POTx-1 is fully CW connects to wiper
- POTx-2 is wiper
- POTX-3 is fully CCW connects to wiper
- To make pot into voltage control
- POTx-1 (CW) = +5V
- POTx-13CCW = GND
- Wire RV1-1 to RV3-1 to RV5-1 on controls card
- Wire RV1-3 to RV3-3 to RV5-3 on controls card
- Wire RV2-1 to RV4-1 to RV6-1 on controls card
- Wire RV2-3 to RV4-3 to RV6-3 on controls card
Jacks
- J6 on the controls card and J37 on the I/O card
Daughtercard Connectors
J5, J37 - POT connectione
J6 - Eurorack Power
- J6 on the I/O card
- Eurorack power
- 2x5 IDC
- GATE, CV not connected
J10 - Jacks connections on Controls card
J38 - Jacks connections
Examples
Arduino NANO MOZZI
NANO Pinout
Controls
- 6 Pots
- RV1 = Analog 7
- RV2 - Analog 4
- RV3 - Analog 6
- RV4 - Analog 3
- RV5 - Analog 5
- RV6 - Analog 2
- 2 CV Input Jacks
- J1 = Analog 0
- J2 = Analog 1
- 1 Output Jack
- J4 = MOZZI HI DEF Audio
Audio Out Schematic
CV In Schematic
- ANA0 in example
Parts
- 3D view
- Top parts view
- Bottom parts view
- With NANO
- CAD placement
Wires
NET: ANA0, A1-19, (C7-1, D1-2, D3-1, R9-2) NET: ANA1, A1-20, (C8-1, D2-2, D4-1, R10-2) NET: ANA2, A1-21, J37-3 NET: ANA3, A1-22, J37-6 NET: ANA4, A1-23, J37-9 NET: ANA5, A1-24, J37-12 NET: ANA6, A1-25, J37-15 NET: ANA7, A1-26, J37-18 NET: J1-T, J38-1, (R7-1, R9-1) NET: J2-T, J38-5, (R10-1, R8-1) NET: J4-T, J38-7, (C10-1, R14-2) NET: GND1, J37-7 NET: GND2, J38-6 NET: GND3, A1-4 NET: GND4, A1-29 NET: +5VD, A1-27, J37-11 NET: L5V, J37-14, J37-8 NET: LGND, J37-16, J37-4
Parts List
| Find | Qty | Ref Des | Part Number |
|---|---|---|---|
| 1 | 2 | R7, R8 | 100K |
| 2 | 2 | R9, R10 | 10K |
| 3 | 2 | R11, R14 | 3.9K |
| 4 | 2 | R12, R13 | 1M |
| 5 | 4 | D1-D4 | BAT41 |
| 6 | 8 | C1-C8 | 0.1uF |
| 7 | 1 | C9 | 4.7nF |
| 8 | 1 | C10 | 10nF |
| 9 | 1 | J5 | HEADER, 2X10 |
| 10 | 1 | J6 | HEADER, 2X8 |
| 11 | 1 | J10 | HEADER, 1x8 |
| 12 | 1 | A1 | Arduino_Nano_v3 |
Software
- PROTO01_POTS_CHECK.ino - Dump pots/input jacks to screen
CV4 - 4 Control Voltages
- Pot controlled CV generator
- Useful for testing VCOs, etc
- (4) Buffered Outputs
- 4 Pots
- RV1-RV4 used
- RV5, RV6 not used
- 4 Jacks
- RV1 controls J1, etc
- Output voltage Levels are assignable via jumpers
- +5V/GND
- +12V/-12V
- +12V/GND
Opamp Choices
- 8 pin Opamps
3D PCB Layout
- Board soldermask is actually black, but shown in green for contrast
- Details
Schematic
Opamp buffers
- Voltage selection headers
Output jacks
- Jack grounds connected on Controls card (3 jumpers)
- Single ground connection on daughtercard (1 jumper)
Pots on Controls card
- Connections of CW and CCW
- RV1 goes to RV2
- RV3 goes to RV4
Control Board Wiring
- NODE: GND, J1-GND to J3-GND
- NODE: GND, J2-GND to J4-GND
- NODE: GND, J3-GND to J4-GND
- NODE: GND, RV1-3 to RV3-3
- NODE: GND, RV2-3 to RV4-3
- NODE: VCC, RV1-1 to RV3-1
- NODE: VCC, RV2-1 to RV4-1
Daughtercard wiring
- NODE: J1-T*, U1-1 to R5 (other side goes to J38-8)
- NODE: J2-T*, U1-7 to R8 (other side goes to J38-4)
- NODE: J3-T*, U2-1 to R6 (other side goes to J38-6)
- NODE: J4-T*, U2-7 to R7 (other side goes to J38-2)
- NODE: LB1, U1-1 to U1-2
- NODE: LB2, U1-6 to U1-7
- NODE: LB3, U2-1 to U2-2
- NODE: LB4, U2-6 to U2-7
- NODE: GND, J38-3 or 5 (nearest GND) bus hole
- NODE: VH1, H1-2 (+12/+5 header) to U1-8
- NODE: VL1, H2-2 (GND header) to U1-4
- NODE: VH2, H3-2 (+12/+5 header) to U2-8
- NODE: VL2, H4-2 (GND header) to U2-4
- NODE: VH1, U1-8 to J37-8 (POT2-CW)
- NODE: VL1, U1-4 to J37-10 (POT2-10)
- NODE: VH2, U2-8 to J37-5 (POT4-CW)
- NODE: VL2, U2-4 to J37-7 (POT4-CCW
- NODE: POT1W, J37-18 to U1-3
- NODE: POT2W, J37-9 to U1-5
- NODE: POT3W, J37-15 to U2-3
- NODE: POT4W, J37-6 to U2-5
Daughtercard Parts List
| Find | Qty | Ref Des | Part Number |
|---|---|---|---|
| 1 | 4 | H1-H4 | Conn_01x03 |
| 2 | 1 | J5 | HEADER, 2X10 |
| 3 | 1 | J6 | HEADER, 2X8 |
| 4 | 1 | J10 | Conn_01x08 |
| 5 | 4 | R5-R8 | 1K |
| 10 | 2 | R6, R7 | 1K |
| 6 | 2 | U1, U2 | SOCKET, 8 PIN |
| 7 | 2 | U1, U2 | TL072 |
Controls card Parts List
- RV1-RV4 = B100K pots
- R1-R4 = 1K
- J1-J4 = PJ301BM
- J5 = Socket, Female, 2x10
- J10 = Socket, Female, 1x8
Slew Rate Controller
The D107 is a very simple dual slew rate limiter. It can be used for portamento effects or to smooth out a stepped voltage from a sequencer, or for general audio or CV smoothing. Each channel contains a buffer with 100K input impedance suitable for pitch CVs. The slew pot affects the charging of a large capacitor connected to a second amplifier. The second amp provides buffering for output to isolate the output jack from the actual slewing function. Specifications: Dual slew rate limiter Control range of 0-10s (approx.) Power: +12V @ 5mA, -12V @ 5mA
