Figure 1. BSCORE Dev Pedal PCB

Table of Contents

  1. Schematic Diagram
  2. Off-Board Parts Wiring Diagram
  3. Top Layer Layout
  4. Bottom Layer Layout
  5. On-Board Part List
  6. Off-Board Part List
  7. Printable Enclosure Drill Template
  8. Printable Enclosure Label
  9. Building Guide


1. Schematic Diagram

Figure 2. Schematic Diagram of BSCORE Dev Pedal Circuit

2. Off-Board Parts Wiring Diagram

Figure 3. Off-Board Parts Wiring Diagram

3. On-Board Part List

Note: C11 uses multi-layer ceramic capacitor (MLCC) because it should have maximum height of about 5 mm when soldered onto the board, you can use value between 0.1 to 1uF for this capacitor.

210uF/16V electrolytic capacitorC1,C22
34.7uF/16V electrolytic capacitorC3,C4,C5,C6,C7,C86
447nF CapacitorC9,C102
5100nF Multilayer CeramicC111
61nF CapacitorC12,C13,C143
71N4002/1N4001/1N4007 DiodeD11
81N4148 DiodeD21
13B10K, right angle PCB-Mount potentiometerP1,P2,P3,P4,P5,P66
1410R , 0.25W ResistorR1,R22
15330R , 0.25W ResistorR31
1647R , 0.25W ResistorR4,R52
17220R , 0.25W ResistorR61
18100K, 0.25W ResistorR7,R82
291K , 0.25W ResistorR9,R10,R133
201M , 0.25W ResistorR11,R122
23LM1117T-3.3 Voltage regulator ICU1 1
24H11L1 optocouplerU21

4. Off-Board Part List

Note: Use isolated 3.5 mm TRS sockets for J1-J4 (like shown in the Figure 4), since the board has separate audio ground and digital ground to minimize the digital noise. For audio input-output (J5-J8), use mono or stereo socket with small case overhead (like shown in the Figure 5), so it could fit in this critical spacing design.

1SPST Momentary FootswitchFS1,FS22
2ISOLATED 3.5 mm TRS socketJ1,J2,J3,J44
4MONO audio socket 6.35 mmJ5,J6,J7,J84
5ISOLATED 2.1 mm DC socketJD1
Figure 4. Isolated 3.5 mm TRS Sockets
Figure 5. Small Case-Overhead 6.35 mm Audio Sockets

5. Top Layer Layout

Figure 6. BSCORE Dev Pedal PCB Top Layer Component Layout

6. Bottom Layer Layout

Figure 7. BSCORE Dev Pedal PCB Bottom Layer Component Layout

7. Printable Enclosure Drill Template

Download in PDF document (right-click and save)


8. Printable Enclosure Label

Download in PDF document (right-click and save)


9. Building Guide

  1. Make sure the enclosure has been drilled, painted, and labeled.
  2. Solder all components of the top layer, including all the header connectors. Make sure the LM1117-3.3V is mounted on the board to have as short as possible height.
  3. Solder all bottom layer resistors (R9, R10, R13), those are all bottom layer components except the potentiometers, LEDs, and switches.
  4. To reduce the mechanical stress on the PCB when mounted the the enclosure through by potentiometers and switches, follow these steps:
    1. Install all potentiometers (P1-P6) and toggle switches (SW-POWER, SW-MIDITTL, SW-PROG) loosely to the enclosure.
    2. Mount the PCB to the mounted potentiometers and switches and align perfectly with the enclosure, keep it aligned without soldering.
    3. Tighten the nuts of all the potentiometers and switches while keeping the board mounting aligned, still without soldering.
    4. Solder all potentiometers and switches except P1, P2, and P3.
    5. Cut the leads of P1, P2, and P3 as short as possible, so they have zero height before get soldered.
    6. Solder P1, P2, and P3 without excessive tin so it produces thin or flat soldering surface in the top layer. This will make the BSCORE module insertion possible/easier.
    7. Unmount the board and the potentiometers assembly from the enclosure.
    8. Re-solder the potentiometers P1, P2, P3 from the bottom to add more strength, but be careful not to let the tin flows to the other side.
    9. Mount the LEDs with the following steps:
      1. Twist the LEDs for D-POWER, D-AUX, and D-MAIN 90 degrees before mounting them to the PCB, as shown in the figure 8. This twisting enables omni-directional horizontal adjustment after get soldered to PCB.
      2. Mount each LEDs and adjust the height to get aligned with the adjacent switch as the reference.
      3. Solder the LEDs from both sides (top and bottom layer) to get maximum strength against pushing and pulling off the board.
    10. Cut all the excessive components leads.
    11. Re-mount the board assembly to the enclosure through the potentiometers switches, secure their nuts tightly.
    12. Mount the footswitches (FS1, FS2) to the enclosure, and wire them to the board using single female header cable jumper (Figure 9). See Figure 3 as the wiring reference for off-board parts.
    13. After the footswitches get wired, you can mount all other sockets (JD, J1-J8) to the enclosure and wire them to the board using cable jumper/single female header in any order (Figure 10(A)). See Figure 3 as the wiring reference for off-board parts.
    14. Insert the BSCORE Module to its header (Figure 10(B)).
    15. Secure the enclosure with its base-lid, now the pedal is ready to use (Figure 11).
Figure 8. Lead Twisting Before Mounting The LED
Figure 9. Single Female Header Dupont Connector Cable Jumper
Figure 10. BSCORE Dev Pedal Assembly (A) Without The BSCORE Module, (B) With The BSCORE Module
Figure 11. Ready-to-Use BSCORE Dev Pedal

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