# Digital Delay Pedal S.O. (Solo) ## Description MODDED Boy in Well Digital Delay Pedal (PT2399-Based Guitar Effect) w/ Self Oscillation Switch ## Project Details - **Owner:** rojas-mtl - **Created:** 1/30/2026 - **Last Updated:** 2/4/2026 - **Visibility:** Public - **Filter Output Pin:** 2 - **DD3 Pin 2 Function:** GND. Connect to solid ground reference. Keep return for input/output capacitors local; avoid sharing with noisy digital currents. - **Manufacturer Name:** Texas Instruments - **Logic Function:** Regulator - **Capacitor BOM:** {} - **DD3 Pin 1 Function:** OUT (regulated 5 V output). Route to NP5V net. Place output bypass capacitor(s) close between OUT (Pin 1) and GND (Pin 2). - **LP2950-50 Pin Note:** LP2950-50LPRE3 (TO-92-3, viewed from flat face, leads downward): Pin 1 = OUT (regulated 5 V output), Pin 2 = GND, Pin 3 = IN (unregulated input). Do NOT assume 78L05 pinout; 78L05 in TO-92 is typically 1 = IN, 2 = GND, 3 = OUT, which is reversed relative to LP2950-50. - **Max Output Voltage:** 5V - **License:** http://solderpad.org/licenses/SHL-2.1/ - **Filter Output Designator:** R8 - **Operating Voltage:** 9V - **Role:** Power Conversion - **Diode BOM:** {} - **Role Details:** 5 V low-dropout linear regulator for pedal power rail NP5V. TO-92-3 pinout (flat face, leads downward): Pin 1 = OUT (regulated 5 V), Pin 2 = GND, Pin 3 = IN (unregulated VIN). Do NOT use 78L05 pin mapping. - **System Architecture:** flowchart TD P(Power) --> IB(Input Buffer) IB --> DE(Delay Engine) DE --> F(Filters) F --> OB(Output Buffer) OB --> OUT(Output) F --> FB(Feedback) FB --> DE IB --> TB(True-Bypass) TB --> OUT - **Filter Output Net:** VCO - **Resistor BOM:** {} - **Filter Input Resistor Value:** {} - **Net Type:** Power - **LP2950-50 Layout Guidelines:** Place input and output bypass capacitors as close as possible to LP2950-50 pins: (1) Input capacitor (e.g., 1–10 uF electrolytic or tantalum plus 100 nF ceramic) from IN (Pin 3) to GND (Pin 2), (2) Output capacitor (e.g., 1–10 uF low-ESR electrolytic or tantalum plus 100 nF ceramic) from OUT (Pin 1) to GND (Pin 2). Keep these loops compact, use a solid ground reference, and avoid routing noisy digital currents through the regulator ground return. - **Filter Input Resistor Designator:** R7 - **Manufacturer Part Number:** LP2950-50LPRE3 - **Package or Case Code:** 92-TO - **Power Requirements:** Battery - **DD3 Pin 3 Function:** IN (unregulated VIN from DC jack PWR1 center pin). Place input bypass capacitor(s) close between IN (Pin 3) and GND (Pin 2). - **Domain:** Consumer Electronics - **Part Type:** Linear Regulator - **Copies:** 1 ## Key Components ### CLR — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Mount: Surface Mount - Resistance: 1MΩ - Package or Case Code: R_0603_1608Metric - Role Details: Series resistor for LED indicator - Resistor Type: Through-Hole - Package: 0603 - Role: Current Limiting - Manufacturer Part Number: GENERIC-RES-0603 - Part Type: Fixed Resistor **Pins:** - P1 [pin 1] - P2 [pin 2] ### D1 — [1N4001](https://www.flux.ai/adrian95/1n4001.md) - Part Type: Diode - Datasheet URL: https://diotec.com/request/datasheet/1n4001.pdf - Manufacturer Name: Diotec Semiconductor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4001 **Pins:** - A [pin 2] - K [pin 1] ### DD1 — [PT2399](https://www.flux.ai/kicad-part-library/pt2399.md) - Integrated Circuit Type: Linear - Role Details: Digital delay processor - Part Type: Integrated Circuit - Allow Substitutes: Yes - Package or Case Code: DIP-16_W7.62mm - Datasheet URL: http://www.princeton.com.tw/Portals/0/Product/PT2399_1.pdf - Manufacturer Name: Princeton Technology - Manufacturer Part Number: PT2399 - Role: Signal Generation **Pins:** - AGND [pin 3] - CC0 [pin 8] - CC1 [pin 7] - CLK_O [pin 5] - DGND [pin 4] - LPF1-IN [pin 16] - LPF1-OUT [pin 15] - LPF2-IN [pin 13] - LPF2-OUT [pin 14] - OP1-IN [pin 10] - OP1-OUT [pin 9] - OP2-IN [pin 11] - OP2-OUT [pin 12] - REF [pin 2] - VCC [pin 1] - VCO [pin 6] ### DD3 — [LP2950-50LPRE3](https://www.flux.ai/lcsc/lp2950-50lpre3.md) - Product Info Url: https://lcsc.com/product-detail/Linear-Voltage-Regulators_TI_LP2950-50LPRE3_LP2950-50LPRE3_C129349.html - Role Details: 5V LDO regulator - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-LP2950-50LPRE3_C129349.pdf - Allow Substitutes: Yes - Package or Case Code: TO-92-3_L4.8-W3.7-P2.54-L - Manufacturer Name: Texas Instruments - Integrated Circuit Type: Power Management - Manufacturer Part Number: LP2950-50LPRE3 - Part Type: Linear Regulator - Role: Voltage Reference - LCSC Part Number: C129349 - JLCPCB Part Class: Extended Part - Max Output Voltage: 5V **Pins:** - GND [pin 2] - IN [pin 3] - OUT [pin 1] ### J1 — [MJ-63042J](https://www.flux.ai/adrian95/mj-63042j.md) - Manufacturer Part Number: MJ-63042J - Role: Connector - Part Type: Connector - Connector Type: Audio / Video Connectors - Role Details: Input 1/4-inch mono jack pad - Datasheet URL: https://www.cuidevices.com/product/resource/mj-63042j.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: CUI Devices - Allow Substitutes: Yes **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J2 — [MJ-63042J](https://www.flux.ai/adrian95/mj-63042j.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.cuidevices.com/product/resource/mj-63042j.pdf - Role: Connector - Connector Type: Audio / Video Connectors - Manufacturer Name: CUI Devices - Manufacturer Part Number: MJ-63042J - Allow Substitutes: Yes - Part Type: Connector - Role Details: Output 1/4-inch mono jack pad **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### LED1 — [Generic LED](https://www.flux.ai/jharwinbarrozo/generic-led.md) - Role Details: True-bypass indicator LED - Part Type: LED - Manufacturer Part Number: Generic LED - Allow Substitutes: Yes - Package: LED_0603_1608Metric - Diode Type: LED **Pins:** - A [pin 2] - K [pin 1] ### PWR1 — [PJ-037A](https://www.flux.ai/vasy_skral/pj-037a.md) - Connector Type: Power Connectors - Datasheet URL: https://www.cuidevices.com/product/resource/pj-037a.pdf - Role Details: DC Barrel Jack for power input - Part Type: Connector - Package: Through Hole - Power Requirements: Battery - Manufacturer Name: CUI Devices - Role: Power Source - Manufacturer Part Number: PJ-037A - Allow Substitutes: Yes **Pins:** - Center pin [pin 1] - Terminal [pin 2] ### SW1 — [SWITCH-3PDT-PTH-STOMP](https://www.flux.ai/akoenigs/switch-3pdt-pth-stomp.md) - Manufacturer Part Number: SWITCH-3PDT-PTH-STOMP - Role: Switch - Allow Substitutes: Yes - Manufacturer Name: Sparkfun - Role Details: True-bypass footswitch - Human Interface: Switches - Part Type: Switch - Purchase Url: https://www.sparkfun.com/products/15133 - Datasheet URL: https://cdn.sparkfun.com/assets/3/a/9/c/4/DS-15133-Stomp_Switch.pdf **Pins:** - A1 [pin 1] - A2 [pin 4] - A3 [pin 7] - B1 [pin 3] - B2 [pin 6] - B3 [pin 9] - COM1 [pin 2] - COM2 [pin 5] - COM3 [pin 8] ### SW2 — [Push Button](https://www.flux.ai/jharwinbarrozo/push-button.md) - Manufacturer Name: OMRON - Manufacturer Part Number: B3FS-1050P - Datasheet URL: https://datasheet.lcsc.com/lcsc/1809271215_Omron-Electronics-B3FS-1050P_C231326.pdf - Part Type: Switch **Pins:** - P1 [pin 1] - P2 [pin 3] ### U2 — [TL072IP](https://www.flux.ai/jecstronic/tl072ip.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-TL072IP_C110329.pdf - Manufacturer Part Number: TL072IP - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - -VCC [pin 4] - 1IN- [pin 6] - 1IN- [pin 2] - 1IN+ [pin 3] - 1OUT [pin 1] - 2IN+ [pin 5] - 2OUT [pin 7] - VCC+ [pin 8] ### VR1 TIME — [Potentiometer](https://www.flux.ai/jharwinbarrozo/potentiometer.md) - Package or Case Code: R_POT_PV36W **Pins:** - P1 - P2 - P3 ### VR2 LEVEL — [Potentiometer](https://www.flux.ai/jharwinbarrozo/potentiometer.md) - Package or Case Code: R_POT_PV36W **Pins:** - P1 - P2 - P3 ### VR3 REPEATS — [Potentiometer](https://www.flux.ai/jharwinbarrozo/potentiometer.md) - Package or Case Code: R_POT_PV36W **Pins:** - P1 - P2 - P3 *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/rojas-mtl/digital-delay-pedal-spop-solo](https://www.flux.ai/rojas-mtl/digital-delay-pedal-spop-solo).* --- *Generated from [https://www.flux.ai/rojas-mtl/digital-delay-pedal-spop-solo](https://www.flux.ai/rojas-mtl/digital-delay-pedal-spop-solo)*