Circuit
About the Circuit PCB
Circuit is an open source PCB design by jeff4444, published on GitHub. It is a 2-layer board measuring 65.5 × 43.5 mm, with 15 components from 9 distinct parts.
Other key parts include the PAM8403D and LM358. By type, the board carries 5 resistors, 4 capacitors, 3 diodes, 2 ICs and 1 speaker.
It belongs with the audio designs in this gallery.
From the project
A laser-based audio communication system built for the Howard University IEEE H.O.P.E. (Hands-On PCB Engineering) Project (Fall 2025).
A laser-based audio communication system built for the Howard University IEEE H.O.P.E. (Hands-On PCB Engineering) Project (Fall 2025).
Project Lux is a free-space optical (FSO) communication system that transmits a high-fidelity audio signal over a laser beam.
This project demonstrates the core principles of optical communication. The system consists of two main components: 1. The Transmitter: Modulates an audio signal from a source (like a phone or laptop) onto a laser beam. 2. The Receiver: Intercepts the laser beam, converts the light back into an electrical signal, and amplifies it to…
Main components on the Circuit
Circuit bill of materials (BOM)
15 components, 9 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PAM8403D | SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | LM358 | DIP-8_W7.62mm | U2 |
| 1 | Speaker | PinHeader_1x02_P2.54mm_Vertical | LS1 |
| 3 | BPW34 | Osram_DIL2_4.3x4.65mm_P5.08mm | D1, D2, D3 |
| 2 | 0.1uF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C4 |
| 1 | 1uF | CP_Radial_D4.0mm_P1.50mm | C2 |
| 1 | 20uF | CP_Radial_D5.0mm_P2.50mm | C3 |
| 4 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R4, R5 |
| 1 | 5.1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
Circuit design files
The KiCad project lives in the jeff4444/kicad-projects repository on GitHub; these links point at the commit this page was built from.
Circuit: common questions
How big is the Circuit PCB?
The Circuit measures 65.5 × 43.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Circuit?
15 components, from 9 distinct parts. The full bill of materials is listed on this page.
Where can I download the Circuit design files?
From the jeff4444/kicad-projects repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Circuit design in my own project?
The repository has no license, so all rights stay with jeff4444. Use it as a reference, and ask the author before reusing the design.
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