
Audio board
EleonoreMizo/pedalevite
Pédale Vite — DIY multi-FX pedalboard for guitar/bass/etc.

Engenharia reversa do amplificador BSS500 da Sheldon
Bss500ap is an open-source printed circuit board by KryptonPlusPlus, from the KryptonPlusPlus/bss500-sheldon-reverse repository on GitHub. It is a 2-layer board of 146.3 × 41.1 mm with 63 parts on 33 nets, routed with 322 tracks and 4 vias.
It is built around the BC640, BC639 and MOC3021M. Its parts include 19 resistors, 15 capacitors, 11 connectors, 7 diodes and 6 transistors.
Engenharia reversa do amplificador de áudio Sheldon BSS500, com o objetivo de reconstruir seu circuito, documentar seus componentes e explorar possíveis modificações e melhorias.
[!WARNING] Atenção: As informações deste repositório são baseadas na análise de um amplificador que aparenta ter passado por manutenções ou modificações anteriores. Portanto, alguns valores de componentes e conexões podem diferir do projeto original de fábrica. As informações documentadas são preliminares e devem ser verificadas antes de qualquer reprodução ou montagem do circuito.
Além da reconstrução do circuito, o projeto poderá incluir modificações com fins de estudo, aprimoramento e experimentação.
As possíveis alterações serão avaliadas conforme o avanço da análise do circuito original, considerando aspectos como desempenho, estabilidade, confiabilidade e qualidade de áudio.
O projeto está em desenvolvimento. A reconstrução do esquemático, a identificação dos componentes e a avaliação de possíveis modificações serão realizadas progressivamente.
Este é um projeto independente de engenharia reversa, desenvolvido para fins de estudo, experimentação e documentação. Não se trata de documentação oficial do fabricante Sheldon.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF 100V | Capacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4 | C83, C86, C88, C99 |
| 4 | 1N5408 | Diode_THT:D_DO-201AE_P5.08mm_Vertical_KathodeUp | D4, D5, D6, D7 |
| 4 | 1kR 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R83, R85, R87, R90 |
| 2 | 0.47R 5W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | R93, R94 |
| 2 | 22kR 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R79, R84 |
| 2 | 330R 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R88, R91 |
| 2 | 33pF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C80, C81 |
| 2 | 4700uF 50V | Capacitor_THT:CP_Radial_D18.0mm_P7.50mm | C90, C92 |
| 2 | 47uF 25V | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C84, C85 |
| 2 | 610R 0.5W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R86, R89 |
| 2 | 680R 0.5W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R95, R96 |
| 2 | BC640 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q2, Q6 |
| 2 | D | Diode_THT:D_T-1_P5.08mm_Horizontal | D1, D2 |
| 2 | D_Zener | Diode_THT:D_DO-34_SOD68_P7.62mm_Horizontal | Z1, Z2 |
| 2 | Fuse 250V 3A | Fuse:Fuseholder_Cylinder-5x20mm_Schurter_0031_8201_Horizontal_Open | F1, F2 |
| 2 | bc639 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q3, Q5 |
| 2 | sec | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3, J4 |
| 1 | 100uF 16V | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C89 |
| 1 | 100uF 16V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C91 |
| 1 | 10R 0.5W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R92 |
| 1 | 10uF 50V | Capacitor_THT:C_Radial_D6.3mm_H11.0mm_P2.50mm | C82 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D3 |
| 1 | 2.2R 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R80 |
| 1 | 220pF | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C87 |
| 1 | 33pF | Capacitor_THT:C_Disc_D7.5mm_W5.0mm_P7.50mm | C79 |
| 1 | 390R 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R82 |
| 1 | 4.1kR 1/8W | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R97 |
| 1 | 6.8kR 1/8W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R81 |
| 1 | TL071 | Package_DIP:DIP-8_W7.62mm_LongPads | IC10 |
| 1 | a1962 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | Q1 |
| 1 | ad | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J5 |
| 1 | c5242 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | Q4 |
| 1 | ct af- | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | g.ch | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J10 |
| 1 | gnd | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J6 |
| 1 | led+ | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J2 |
| 1 | led- | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J1 |
| 1 | ph+ | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J11 |
| 1 | v+ | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J7 |
| 1 | v- | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J8 |
It measures 146.3 × 41.1 mm and has 2 copper layers, 1.6 mm thick.
63 parts, built around the BC640, BC639 and MOC3021M. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the KryptonPlusPlus/bss500-sheldon-reverse repository on GitHub, at the commit this page was made from: the board is hardware/bss500ap/bss500ap.kicad_pcb and its schematic hardware/bss500ap/bss500ap.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask KryptonPlusPlus before reusing the design.

EleonoreMizo/pedalevite
Pédale Vite — DIY multi-FX pedalboard for guitar/bass/etc.






