Circuit Simulator

This is a browser-based circuit simulator, no install, no signup, nothing. You just open it and start dropping components and wires like Lego blocks.

Try the Simulator Below:

Now, let us learn how to use this circuit simulator application:

Step 1: Start with the interface

When we open the simulator, then we see a circuit screen with some buttons. Let us understand what is what.

Top Menu (left corner):

• File – Save, Load, Export, Link
• Edit – Undo, Copy, Paste, Delete, etc.
• Draw – All components and parts live here
• Options – Time step, speed, theme, colors
• Circuits – Pre-built demo circuits (super useful!)

Step 2: How to place a resistor, battery, LED etc

• Click on “Draw” from top menu.
• Hover mouse over category like “Passive Components”.
• Click on part you want, like Resistor.
• Now click on the canvas where you want to place it.
• Then click again where the other end goes (drag wire like rubber band).
• Done! Resistor dropped.

Remember, if you see the component greyed out, or RED dots across the component ends, that means your component is not connected correctly and is not working...

Step 3: How to rotate a part?

• After placing a part:
• Right-click on it (or long press on mobile).
• Then Click “Flip” or “Rotate”.

Step 4: How to simulate power supply?

Guys, remember, without battery or voltage source, nothing works!

• Go to Draw >> Sources >> Voltage Source (DC).
• Click to place on canvas.
• Then wire it to your circuit.
• You will see arrows start to move when powered = that means current is flowing....

Step 5: How to add LED + Resistor + Battery

Let us make the classic LED circuit:

• Go to Draw > Sources > Voltage Source (DC) – place it.
• Add Resistor.
• Add LED (under "Diodes").
• Use Wires to connect all in series:
  Battery (+) > Resistor > LED > Battery (–).
• Now LED will blink or glow. If it is not glowing then → reverse LED direction...

Step 6: How to adjust values (resistance, voltage, etc)

• Right-click on a component → Click “Edit”
• Then enter values like:
• Resistor: 1k (for 1000 ohms)
• Voltage source: 9 (for 9V)
• Capacitor: 10u (for 10 microfarads)
• Click OK. Values will update.

Step 7: Connect with Wires

Just click anywhere near a pin → drag mouse → release near other pin.
Boom!!! wire connected!

Step 8: Delete or move parts

• To Delete: Click on part > Press Delete key..
• To Move: Right-click > Drag .
• Or use Edit > Move/Drag/Delete/Copy tools from top menu.

Step 9: Save and Share your Circuit

• Click File > Export as Text .
• You get a weird looking text — this is your circuit code .
• Copy it and save in Notepad, or share with friends.
• To reopen, then click File > Import and then paste this code.
• You can also do File > Link to Circuit to get sharable link...

Step 10: Prebuilt Circuits to Learn

Go to Circuits menu at top, then Try:

• Simple Resistor LED
• Astable Multivibrator
• Op-Amp Circuits
• H-Bridge Motor Control

This will teach you a LOT in 1 click. All working live!

Step 11: Adjust Simulation Speed, Voltage Scale

• Go to Options:
• Simulation Speed – Fast or Slow (good for seeing capacitor charging) .
• Voltage Range – Change max voltage shown.
• Current Display – Enable/disable arrow lines.
• Dark Theme – for cool to eyes look ..

Common Mistakes you want to Avoid

• Forgetting to complete wire = circuit open, and so no current..
• LED reversed = then LED will not glow.
• Too high voltage on LED = then will flash and die..
• Missing ground = then circuit will not simulate properly.