2 layers52.2 × 52.2 mm
Base promicro
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Circuit diagrams and firmware source code for Gboard DIY keyboards
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2 layers81.3 × 50.8 mm
Bluetooth Amp
AleDedor/Dummy-Audio-amplifierA very basic, 2-stages, audio amplifier, designed with discrete THT components.
- Size
- 81.3 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 22
- Pads
- 67
- Tracks, vias
- 199, 0
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 29 Feb 2024
- Updated
- 3 Sep 2024
Overview
Bluetooth Amp is an open-source printed circuit board by AleDedor, from the AleDedor/Dummy-Audio-amplifier repository on GitHub. It is a 2-layer board of 81.3 × 50.8 mm with 30 parts on 22 nets, routed with 199 tracks and 0 vias.
Its parts include 9 resistors, 8 capacitors, 2 ICs, 2 diodes and 2 transistors. It belongs with the audio and music and radio and wireless boards of this library.
README
README.mdDummy-Audio-amplifier
A very basic, 2-stages, audio amplifier, designed with discrete THT components. The goal of the project is to build from scratch a simple audio amplifier in order to get familiarity with the main issues of the audio world.
Main concerns:
- Noise level, keep it as low as possible adding decoupling capacitor as close as possible to the LM741 amplifiers (switching noise of the DCDC converter) and using low value resistors (Thermal noise).
- Limited Bandwidth, in order to reduce noise r.m.s. and filter out external disturbs.
- Push-pull final stage thermal runaway, biasing BJTs with fixed base-emitter voltage cause high dependance on temperature. Introduce emitter resistance to counteract.
- Compensate for Loudspeaker increasing impedance over audio bandwidth with a Zobel network.
- Avoid loop instability (output stage).
Soldered PCB image:
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | TestPoint | TestPoint:TestPoint_Pad_2.5x2.5mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7 |
| 4 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R5, R6 |
| 3 | 22 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R8, R9 |
| 2 | 100n | Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C7, C8 |
| 2 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1, C2 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | LM741 | Package_DIP:DIP-8_W7.62mm_LongPads | U1, U2 |
| 1 | 1000u | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C4 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 10u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C3 |
| 1 | 1u | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C5 |
| 1 | 1u | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C6 |
| 1 | 2N2222 | Package_TO_SOT_THT:TO-18-3 | Q1 |
| 1 | 2N2907 | Package_TO_SOT_THT:TO-18-3 | Q2 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
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Questions
How big is the Bluetooth Amp PCB?
It measures 81.3 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bluetooth Amp use?
30 parts. 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 Bluetooth Amp KiCad files?
From the AleDedor/Dummy-Audio-amplifier repository on GitHub, at the commit this page was made from: the board is Bluetooth_Amp/Bluetooth_Amp.kicad_pcb and its schematic Bluetooth_Amp/Bluetooth_Amp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bluetooth Amp design in my own project?
Its repository states no licence, so its author keeps all rights: ask AleDedor before reusing the design.