Tools, APP Software Used etc.

	Soldering iron (generic)
	Soldering Iron Wire
	KiCad 9.0

Description

Astable Multivibrator Using Transistors

This project is an Astable Multivibrator built with two BC546 NPN transistors, along with resistors and capacitors. It generates a continuous square wave signal without any external clock input.

Features:

Based on BC546 NPN transistors.
Produces a continuous ON/OFF square wave.
Drives blinking LEDs for visual output.
Low-cost and beginner-friendly project.

How it works:

The two BC546 transistors are connected in a cross-coupled feedback arrangement. As one transistor switches ON, it charges the capacitor of the other stage, forcing it OFF. The cycle repeats automatically, generating a stable oscillation.

Applications:

LED blinkers and flashers
Square wave oscillator for experiments
Educational tool to learn transistor switching and oscillators

This circuit is a classic beginner’s project that demonstrates timing, oscillation, and the basic working principles of transistors.

Schematic and Layout

Github

https://github.com/Ondrak-123/All-Files-From-PCBWay

Download Gerbers Download BOM(Bill of materials)

Sep 12,2025

407 views

Astable Multivibrator Using Transistors

Astable multivibrator using BC546 transistors — generates square waves and blinks LEDs reliably.

407

Published: Sep 12,2025

Standard PCB

Download Gerber file 3

BOM(Bill of materials)

Centroid file

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File Last Updated: 2025/09/24 (GMT+8)

File update record

2025-09-2400:17:11

Gerber file is updated.

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