2 layers76.5 × 66.3 mm
2 layers100 × 100 mm
Amply
T76-org/amply14A $10 desktop Bluetooth amplifier you'll love
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 37
- Pads
- 152
- Tracks, vias
- 362, 25
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 May 2026
- Updated
- 6 May 2026
Overview
Amply is an open-source printed circuit board by T76-org, from the T76-org/amply repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 100 × 100 mm with 67 parts on 37 nets, routed with 362 tracks and 25 vias.
It is built around the NE5532, L7805 and BD139, with the BD140 among its other parts. Its parts include 19 capacitors, 13 resistors, 11 connectors, 8 transistors and 6 diodes. It belongs with the audio and music boards of this library.
Main components
4
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BD139
TO-126-65℃~+150℃ 1 NPN 1.5A 10uA 12.5W 500mV 5V 63 80V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD140
TO-126-65℃~+150℃ 1 PNP 1.25W 1.5A 100nA 500mV 5V 63 80V PNP TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
README
README.mdAmply - a $10 Bluetooth amplifier you'll love
Amply is a compact, high-quality audio amplifier and Bluetooth receiver that can be built from roughly $10 worth of widely available parts.
Designed for desktop speakers, it delivers up to 2×10 W into 8 Ω loads while running from an ordinary USB-C power adapter. The entire design uses common, easy-to-source components, making it practical to build almost anywhere.
Despite its low cost, Amply offers surprisingly strong audio performance: THD below 0.015%, excellent linearity, and a flat response extending down to 20 Hz for deep bass, clean mids, and detailed highs.
Features
- 2-channel Bluetooth 5.0 audio receiver
- Optional On/Off, muting, pause, next/previous track controls
- Class AB amplifier capable of delivering up to 2×10 W into 8 Ω
- THD (simulated) below 0.015% at 10W
- Largely-flat frequency response from 20 Hz to 20 kHz
- Powered by a standard USB-C power adapter (5-20 V, 1 A)
Physical design
- Compact PCB design (100 mm × 100 mm)
- Fully open-source
- Easy to assemble; requires only basic soldering skills and a few common tools
- Uses widely available, low-cost components (total cost around $10)
- 3D-printed enclosure design included in the repository
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 2k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R8, R9, R10, R11, R12, R13 |
| 5 | 10µ | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5 |
| 4 | 100p | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C7, C8, C9, C10 |
| 4 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D3, D4, D5, D6 |
| 4 | 4700µ | Capacitor_THT:CP_Radial_D17.0mm_P7.50mm | C13, C14, C15, C16 |
| 4 | BD139 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1, Q3, Q6, Q8 |
| 4 | BD140 | Package_TO_SOT_THT:TO-126-3_Vertical | Q2, Q4, Q5, Q7 |
| 3 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C6, C18, C19 |
| 2 | 0R33 | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P7.62mm_Vertical | R14, R15 |
| 2 | 100k | Potentiometer_THT:Potentiometer_Runtron_RM-065_Vertical | RV3, RV4 |
| 2 | 100µ | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C11, C12 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 2 | 50k | Potentiometer_THT:Potentiometer_Runtron_RM-065_Vertical | RV1, RV2 |
| 2 | SR54 | Diode_THT:D_DO-201AE_P15.24mm_Horizontal | D1, D2 |
| 1 | 10µ | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C17 |
| 1 | AUDIO IN | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | BT MODULE | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J5 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U2 |
| 1 | L_OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J10 |
| 1 | NE5532 | Package_DIP:DIP-8_W7.62mm_LongPads | U1 |
| 1 | NEXT/V+ | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J7 |
| 1 | ON/OFF | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | PAUSE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | POWER IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | PREV/V- | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | R_OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | USB-C+ | Connector_Wire:SolderWirePad_1x01_SMD_2x4mm | J1 |
| 1 | USB-C- | Connector_Wire:SolderWirePad_1x01_SMD_2x4mm | J3 |
The 63 most common of 67 parts.
Questions
How big is the Amply PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Amply use?
67 parts, built around the NE5532, L7805, BD139 and BD140. 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 Amply KiCad files?
From the T76-org/amply repository on GitHub, at the commit this page was made from: the board is Amply.kicad_pcb and its schematic Amply.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Amply 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).
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