ER-CVPOTS4

Features

• Pot controlled CV generator
  • Useful for testing VCOs, etc
• (4) Buffered CV 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
  • MCP6002, 5V max
  • MCP6232, 5V max, rail to rail
  • LM358, 3-36V
  • 4558, +/-4V (min), +/-18V (max)
  • 14558, +/-2V (min), +/-7V (max)

Schematic

Opamp buffers

• CV 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

J6 - Eurorack Power

• J6 on the I/O card
  • Eurorack power
  • 2x5 IDC
  • GATE, CV not connected

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

Parts Lists

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

3D PCB Layout

• Board soldermask is actually black, but shown in green for contrast

• Details