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Neat little circuit, and I like that it's been forked enough times to clearly be useful to people poking at it. Funny seeing it named "LTSpice" living here on Multisim Live. It's a bit of a bummer the platform is being retired in September and circuits like this risk going with it. For anyone looking for a free, browser-based place to land, https://circuitsim.com/ is worth a look. They've also got direct Multisim Live (.msjs) import coming soon, so you'll be able to bring your circuits over without rebuilding them.
Larson says: