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That voltage and current step generator just added will sure be useful--I've been using a square wave generator for this for evermore in the past

Excellent, glad to hear it! I'd been doing that too, or sometimes using a time-controlled switch. But I think the step voltage will get a lot of use, so I added it as its own component!

What would also be really useful is some provision in the frequency response to show the horizontal axis in radians per second rather than hertz. That way for a properly compensated system the crossover is the reciprocal of the time constant.

Sorry--I should have said "for a properly compensated integrating system"

Interesting. Just to clarify, this would mean having an option for the frequency domain simulation horizontal axis to be:

• "radians per second" (currently Hz)
• log scale (as it is now)
• have grid/ticks/labels at powers of 10, for example: "10 rad/s", "100 rad/s", "1k rad/s", "10k rad/s" and so on

Exactly!! As it is now you have to read off the crossover in Hz, multiply by 2pi then take the reciprocal to get the time constant. In the case of, say an RC filter you would read off the frequency at the -3 db point and go through the same routine to get the time constant. In designing a regulating system for, say motor speed, temperature, position etc Circuit Lab changes Bode plots from a laborious to a quick and easy process.