Got it installed with wine here on my PC. Fonts are a bit wonky, but that happens from time to time, so not going to really bother with it.
Took things for a spin by trying to build your basic low-pass filter as one might see on a momentary-contact button (etc.).
Thing is, I wasn't seeing any "switch" or "button" type symbols -- am I just blind, and missed them somewhere in the myriad of semi-cryptic parts, or is it just that they happen to not be modeled in the base product?
There's a voltage-controlled switch SW. Ask HELP to search for 'switch'.
S is in the index too.
In the component selector, search for SW. It needs a .model statement.
Use a voltage source to switch it.
Or just poke a voltage source into your filter. Or use a voltage source and a mosfet.
Yeah, I saw that. I was looking for "generic bogus button" type "switch" (not that sw or csw wouldn't work). I'll probably just work-around it by inserting one of the variable voltage sources I noticed (IIRC, one said it'd do square wave, I think).
Yeah, the V voltage source (in "advanced" mode) has a pulse generator mode.
I usually specify a rise and fall time. LT is a little weird if you use defaults.
Note that if Tr=Tf=Ton=1, it's above zero for 3 seconds. Ton is the flat part.
Sometimes it's handy to use a sine wave source and square it up with a comparator. That makes square waves easier.
An e with a tanh function makes a nice comparator.
Yes, I'm starting to notice that :)
Thanks (and for the hint about comparators). Lots to learn here :)
The standard ltspice switch has a nice infinitely-differentiable characteristic if you specify a negative hysteresis value. It’s an arctan rather than tanh, but it works just as well.
Cheers
Phil Hobbs
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.