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2 layers146.3 × 41.1 mmBss500ap, the printed circuit board in 3D

Engenharia reversa do amplificador BSS500 da Sheldon

Size
146.3 × 41.1 mm
Copper layers
2
Thickness
1.6 mm
Parts
63
Nets
33
Pads
130
Tracks, vias
322, 4
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
27 Oct 2026
Updated
28 Oct 2026

Overview

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.

Main components

3

README

readme.md

Sheldon BSS500 — Reverse Engineering

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.

Objetivos

  • Reconstruir o esquemático eletrônico a partir do equipamento físico.
  • Identificar e documentar os componentes utilizados.
  • Registrar as conexões e o funcionamento dos estágios do amplificador.
  • Investigar possíveis modificações e melhorias no circuito.
  • Documentar as alterações realizadas e seus efeitos no funcionamento do equipamento.

Modificações e melhorias

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.

Status do projeto

O projeto está em desenvolvimento. A reconstrução do esquemático, a identificação dos componentes e a avaliação de possíveis modificações serão realizadas progressivamente.

Disclaimer

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.

Parts

63
QtyValueFootprintReferences
4100nF 100VCapacitor_THT:C_Rect_L10.0mm_W4.0mm_P7.50mm_MKS4C83, C86, C88, C99
41N5408Diode_THT:D_DO-201AE_P5.08mm_Vertical_KathodeUpD4, D5, D6, D7
41kR 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR83, R85, R87, R90
20.47R 5WResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_HorizontalR93, R94
222kR 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR79, R84
2330R 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR88, R91
233pFCapacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mmC80, C81
24700uF 50VCapacitor_THT:CP_Radial_D18.0mm_P7.50mmC90, C92
247uF 25VCapacitor_THT:CP_Radial_D5.0mm_P2.50mmC84, C85
2610R 0.5WResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR86, R89
2680R 0.5WResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR95, R96
2BC640Package_TO_SOT_THT:TO-92_Inline_WideQ2, Q6
2DDiode_THT:D_T-1_P5.08mm_HorizontalD1, D2
2D_ZenerDiode_THT:D_DO-34_SOD68_P7.62mm_HorizontalZ1, Z2
2Fuse 250V 3AFuse:Fuseholder_Cylinder-5x20mm_Schurter_0031_8201_Horizontal_OpenF1, F2
2bc639Package_TO_SOT_THT:TO-92_Inline_WideQ3, Q5
2secConnector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ3, J4
1100uF 16VCapacitor_THT:CP_Radial_D5.0mm_P2.50mmC89
1100uF 16VCapacitor_THT:CP_Radial_D10.0mm_P5.00mmC91
110R 0.5WResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR92
110uF 50VCapacitor_THT:C_Radial_D6.3mm_H11.0mm_P2.50mmC82
11N4001Diode_THT:D_DO-41_SOD81_P10.16mm_HorizontalD3
12.2R 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR80
1220pFCapacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mmC87
133pFCapacitor_THT:C_Disc_D7.5mm_W5.0mm_P7.50mmC79
1390R 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR82
14.1kR 1/8WResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR97
16.8kR 1/8WResistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_HorizontalR81
1TL071Package_DIP:DIP-8_W7.62mm_LongPadsIC10
1a1962Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_VerticalQ1
1adConnector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ5
1c5242Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_VerticalQ4
1ct af-Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ9
1g.chConnector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ10
1gndConnector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ6
1led+Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ2
1led-Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ1
1ph+Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ11
1v+Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ7
1v-Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_VerticalJ8

Questions

How big is the Bss500ap PCB?

It measures 146.3 × 41.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Bss500ap use?

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.

Where can I download the Bss500ap KiCad files?

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.

Can I use the Bss500ap design in my own project?

Its repository states no licence, so its author keeps all rights: ask KryptonPlusPlus before reusing the design.

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