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Siren circuit won't simulate

Hi, I'm new to this application. I built the "Siren" circuit from Mims on my breadboard. It works fine. But I simulated it on Circuit Lab and the output is 'flatlined' - no oscillation https://www.circuitlab.com/circuit/79sgkwgx48ca/siren/

Am I missing something?

by mackenhat
December 08, 2021

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