Forums » CircuitLab Feature Requests

Although I could probably create a power level inverter to allow me to switch power off in the middle of testing, it would be nice to be able to be able to have the switch turned on at t0 and to turn off at a designated time.

You cn do that with an AC source set for square wave.

That will work for DC input, but the solutions become more complicated when you wish to switch an AC input off. An example of this would be when simulating how the voltage discharges in a AC to DC power supply after you remove the input power.

I think @arduinohacker meant use the square wave to turn a Voltage Controlled Switch on and off.

You could also drive it with a Digital Clock to set an arbitrary duty cycle.

If you drive the Voltage Controlled Switch with a PWL() or PWS() voltage source then you have complete control over when the switch turns on and off.

And here's a really cool trick:

This isn't the same thing as turning a switch on and off because the output impedance is always that of the behavioural source but I thought it worth posting as it may be useful in other applications.

Info on PWL() or PWS() sources is in here:

https://www.circuitlab.com/docs/expressions/