2 layers56 × 65 mm
SeaTalk1
dotnet/iot
This repo includes .NET Core implementations for various IoT boards, chips, displays and PCBs.
24 parts2.4kMIT
2 layers47.5 × 50.5 mm
Transistor amp
whatwareweb/transistor-ampsimple transistor amplifier for Hack Club Solder
- Size
- 47.5 × 50.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 19
- Pads
- 64
- Tracks, vias
- 111, 2
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 1 May 2025
- Updated
- 30 May 2025
Overview
Transistor amp is an open-source printed circuit board by whatwareweb, from the whatwareweb/transistor-amp repository on GitHub. It is a 2-layer board of 47.5 × 50.5 mm with 24 parts on 19 nets, routed with 111 tracks and 2 vias.
Its parts include 9 transistors, 8 resistors, 2 diodes, 1 capacitor and 1 connector. It belongs with the audio and music boards of this library.
README
README.mdtransistor-amp
Simple transistor amplifier for Hack Club Solder
This amplifier is based on the highly popular LM386 op-amp chip, although it has been somewhat downgraded for the sake of low component count (eg no constant current source, etc)
Features
- Class AB for higher efficiency
- Runs on ~6V (2xCR2032 or external power supply input)
- Small size, crammed in just over 3 square inches
- Decent performance in SPICE simulation
- higher THD than the original IC but not too bad
- 250mW power output (yeah that's pretty low 😭)
BOM
| Part | Qty | Notes |
|---|---|---|
| Battery holder 2032 | 2 | |
| 820uF Capacitor | 1 | |
| Generic diode | 2 | Needs to have 0.7v Vf |
| 5mm terminal block | 1 | Optional |
| NPN transistor | 5 | I used 2N3904 |
| PNP transistor | 4 | I used 2N3906 |
| 10k potentiometer | 1 | |
| 10k resistor | 2 | |
| 1.5k resistor | 1 | |
| 15k resistor | 1 | |
| 47k resistor | 1 | |
| 220 ohm resistor | 3 |
3d view
Schematic
PCB
Simulation results
slack username: @whatware
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | NPN | Package_TO_SOT_THT:TO-92L_Inline | Q2, Q3, Q6, Q8, Q9 |
| 4 | PNP | Package_TO_SOT_THT:TO-92L_Inline | Q1, Q4, Q5, Q7 |
| 3 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R7, R8 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 2 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1, BT2 |
| 2 | D | Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal | D1, D2 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
| 1 | 15k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 1k5 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 820u | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | Conn_01x06_Pin | TerminalBlock:TerminalBlock_bornier-6_P5.08mm | J1 |
Questions
How big is the Transistor amp PCB?
It measures 47.5 × 50.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transistor amp use?
24 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 Transistor amp KiCad files?
From the whatwareweb/transistor-amp repository on GitHub, at the commit this page was made from: the board is transistor-amp.kicad_pcb and its schematic transistor-amp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transistor amp design in my own project?
Its repository states no licence, so its author keeps all rights: ask whatwareweb before reusing the design.
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