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CIRCUIT · ASTABLE MULTIVIBRATOR

Astable Multivibrator Circuit Diagrams

Generate precise astable multivibrator circuit diagrams instantly. Whether you're learning basic electronics, designing a blinking LED, or building a square wave oscillator, these examples give you a head start.

4 EXAMPLES· UPDATED 2026-06-26
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ABOUT

About these examples.

This collection covers classic BJT‐based vibrators, energy‑efficient CMOS versions, and precision op‑amp designs. Each example shows component values, connections, and output waveforms—ready to customize.

Perfect for students, hobbyists, and professional engineers who need accurate schematics fast, without the learning curve of complex CAD tools. Use the generator below to tweak a template or start from scratch.

HOW TO

Make one yourself.

  1. 1

    Open the circuit diagram tool

    Launch the online editor—no install needed—and select a blank canvas or an astable multivibrator template.

  2. 2

    Place the core components

    Drag transistors (BJT, MOSFET, or op‑amp), capacitors, and resistors onto the grid. Arrange them in the classic cross‑coupled configuration.

  3. 3

    Wire the connections

    Draw lines between the collectors, bases, capacitors, and power rails. The tool snaps to terminals for a clean layout.

  4. 4

    Set values and labels

    Assign resistor and capacitor values to set your desired frequency. Add reference designators like R1, C1, and Q1.

  5. 5

    Export or simulate

    Download the diagram as SVG, PNG, or PDF. Optionally run a simulation to verify the oscillation frequency and waveform.

FAQ

Frequently asked questions

What is an astable multivibrator?01
An astable multivibrator is an electronic oscillator circuit that continuously switches between two states without external triggering. It produces a steady square wave output and is commonly used in clocks, timers, and LED flashers.
What components are needed for a basic BJT astable?02
A standard bipolar junction transistor (BJT) astable uses two NPN transistors, two capacitors, four resistors, and a power supply. The configuration is symmetrical, with cross‑coupling between the collector and base of each side.
How do I calculate the output frequency?03
For a symmetric BJT astable, the oscillation frequency is roughly f = 1 / (1.38 * R * C) for each timing branch, assuming both R and C values are equal. The duty cycle can be adjusted by varying the resistor ratios.
Can I build a multivibrator without bipolar transistors?04
Yes. CMOS gates (e.g., 40106) or operational amplifiers can be used to create reliable astable circuits with fewer passive components, often with better stability and lower power consumption.
Is it possible to simulate the circuit before building it?05
Absolutely. Many online circuit diagram tools, including ours, offer built‑in SPICE‑based simulation. You can test your astable multivibrator, see the waveform, and verify timing before soldering.
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Open the AI editor and describe what you need — export PNG/SVG when you're done.

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