This is a PCB design for a transistor-based astable multivibrator, a simple square wave oscillator. The circuit is configured to use two NPN transistors in a common emitter configuration, which causes two LEDs to flash alternately, demonstrating a 180-degree phase shift. The entire design was created using KiCad software.
| Component | Value | Description |
|---|---|---|
| Transistors | 2N3904 (Q1, Q2) | Two NPN BJTs. |
| Resistors | 300 Ω (R1, R4) | Resistors for the LEDs. |
| 47 kΩ (R2, R3) | Resistors to control transistor's base voltage and timing of the oscillation. | |
| Capacitors | 10 µF (C1, C2) | Timing capacitors that charge and discharge alternatively to create the oscillation. |
| Diodes | LED (D1, D2) | LEDs that provide a visual indication of the output. |
| Switch | SPDT (SW1) | Single Pole Double Throw switch to control the circuit. |
| Power | Battery (BT1) | A power source for the circuit. |
| Mounting | H1, H2, H3, H4 | Four mounting holes for holding the PCB. |
All design and gerber files for this project are included in the repository (files added at top) and can be opened with KiCad.
- Schematic:
schematic.kicad_sch - PCB Layout:
pcb board.kicad_pcb - Gerber Files:
gerber.zip
