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Please add "duty cycle" to voltage function generator

Hmmm.

Should the duty cycle affect just the squarewave function or should it have the effect of distorting the shape of sinusoids and tilting the sawtooth and triangle edges in a consistent way?

In the meanwhile ... have you seen this thread?

https://www.circuitlab.com/forums/feature-requests/topic/77s2nvke/changeable-duty-cycle-for-voltage_current-signal-sources/

:)

Another quick option is to use the piecewise-step notation -- see behavioral sources and expressions in the documentation.

1. Create voltage source.
2. Set voltage to "PWSREPEAT(0,5,10u,0,100u,0)"

This creates a 10kHz square wave source with 10% duty cycle, 5V when on and 0V when off.