2 layers211.2 × 87.8 mm
2 layers77.5 × 50.8 mm
Protection board
Markus-Fitz/Protection-board1Speaker-protection board for power amplifier.
- Size
- 77.5 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 71
- Nets
- 35
- Pads
- 151
- Tracks, vias
- 259, 7
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 8 Apr 2024
- Updated
- 8 Apr 2024
Overview
Protection board is an open-source printed circuit board by Markus-Fitz, from the Markus-Fitz/Protection-board repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 77.5 × 50.8 mm with 71 parts on 35 nets, routed with 259 tracks and 7 vias.
It is built around the BD140, TIP41 and TIP42. Its parts include 23 resistors, 17 transistors, 14 connectors, 7 diodes and 4 capacitors. It belongs with the audio and music boards of this library.
Main components
3README
README.mdProtection-board
Speaker-protection board for power amplifier.
Description
The board includes a relay that connects or disconnects the speakers from the amplifiers. The circuit includes a delay function to avoid initial transients to damage the speakers, a DC-detection to protect the speakers in case of a failing output stage or wrong DC-adjustment and a temperature-sensing circuit which disconnects the speakers from the amplifiers in case of overtemperature.
Parts
71| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10k | Resistor_THT:r_vertical_symm | R14, R16, R18, R19, R20, R21, R25, R28, R29 |
| 9 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q6, Q9, Q10, Q11, Q12, Q13, Q16, Q19 |
| 5 | 2N3906 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q2, Q15, Q17, Q18, Q20 |
| 4 | 100k | Resistor_THT:r_vertical_symm | R1, R17, R23, R24 |
| 4 | 1k | Resistor_THT:r_vertical_symm | R22, R26, R27, R30 |
| 3 | +12V_reg | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J8, J10, J13 |
| 3 | -12V_reg | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J11, J12, J14 |
| 3 | 10u 25V | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C7, C8, C9 |
| 3 | 27k | Resistor_THT:r_vertical_symm | R4, R5, R8 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D5, D6 |
| 2 | 4k7 | Resistor_THT:r_vertical_symm | R3, R6 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 2 | Zener_13V | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D2, D3 |
| 2 | Zener_5V | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D1, D7 |
| 1 | 100u 6.3V np | Capacitor_THT:C_Radial_D8.0mm_H11.5mm_P3.50mm | C12 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV2 |
| 1 | 2k2 | Resistor_THT:r_vertical_symm | R15 |
| 1 | BD140 | Package_TO_SOT_THT:TO-126-3_Vertical | Q14 |
| 1 | D | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D4 |
| 1 | FINDER-40.52 | Relay_THT:Relay_DPDT_Finder_40.52 | K2 |
| 1 | GND_in | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J2 |
| 1 | NTC_10k | Connector_Wire:SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | J7 |
| 1 | TIP41 | Package_TO_SOT_THT:TO-220-3_Vertical | Q3 |
| 1 | TIP42 | Package_TO_SOT_THT:TO-220-3_Vertical | Q4 |
| 1 | V+_unreg | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J1 |
| 1 | V-_unreg | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J9 |
| 1 | amp_in_l | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J4 |
| 1 | amp_in_r | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J5 |
| 1 | spkr_out_l | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J3 |
| 1 | spkr_out_r | Connector_Wire:SolderWire-0.5sqmm_1x01_D0.9mm_OD2.1mm | J6 |
The 69 most common of 71 parts.
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Questions
How big is the Protection board PCB?
It measures 77.5 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Protection board use?
71 parts, built around the BD140, TIP41 and TIP42. 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 Protection board KiCad files?
From the Markus-Fitz/Protection-board repository on GitHub, at the commit this page was made from: the board is KiCAD/Protection_board.kicad_pcb and its schematic KiCAD/+-12V_regulators.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Protection board design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).