Website or application to design and simulate simple circuits?

@yurkshirelad Run a web search for 'LT spice'.  It should take you in the right direction.

Thanks Centari. It popped up on a search but I didn't get round to looking at it yet.

I'm not sure if anyone is using this, but I have this working in my browser for a simple circuit: https://easyeda.com.

The only thing it doesn't appear to do, which would be useful, is to let you interact with sensors, buttons and switches and update the simulation in real-time.

It's safer when I work virtually!

 This is helping me understand basic electronics without destroying components or myself. 😀 

Another site is Tinkercad. It also has several modules available.

LT Spice is a very common and good tool, originally from Linear Technology which is now a part of Analoge Devices. You get details about many components for LT Spice. I try to show you a simle example

I'm using, and still learning KiCad.  It has a steep learning curve, but does everything from circuit schematic to pcb layout.  Hence why I did not recommend it off the bat.  However, once you're comfortable working with the electronics and designing circuits, it's a very worthwhile package.  Open source, continuously maintained, and free for hobbyists like us.  It is to the point that commercial interests are using it as well.

Thanks all.

and here is the result of the simulation:  The circuit should make a sharp pulse aot of the mains sinus voltage for a clock or a dimmer circuit.

I managed to draw a very basic circuit in LTSpice but I need to read the simulation documentation next.

https://www.circuit-diagram.org/editor/ seems to be a nice, simple circuit editor. It might be a useful tool for me as it isn't overwhelming me with features I don't need.

https://www.circuitlab.com/ might be another option.

Posted by: @sj_h1

Another site is Tinkercad. It also has several modules available.

 

I'll second the Tinkercad suggestion.  You're not going to simulate a CPU on it, but it's great for basic, quick circuits for use with Arduino.  Not to mention you can simulate the code against the hardware without wasting uploads to your real Arduino (You can and WILL eventually wear out the flash on it).

Thanks - TinkerCad is on my list to look at.

There is also CircuitJS.  The web site doesn't seem to be responding right now.  I sure hope it's not down permanently.  It has (had?) a downloadable version you can use locally.  It supports a number of types of components, with the ability to measure voltage and current at connection points in your circuit.