I'm trying to build a circuit to solve the differential equation x''+2x'+x = f(t), where f(t) is a sine wave with frequency 5Hz and amplitude 0.5V. I am supposed to get a sine/cosine wave (as the diff. eq is just the same as the ove governing spring-mass forced oscillation) as solution, but instead I get a delta function every 0.1s with alternating sign. What's wrong with my circuit? How should I modify it to get the solution I want, and what else do I need to pay attention when solving any 2nd-order diff equation with constant coefficients in general?(adsbygoogle = window.adsbygoogle || []).push({});

PS: I'm actually a 1st-year physics student with very little prior experience in circuit. Sorry if this question sounds stupid. thanks

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# Using analog computer to solve 2nd-order diff eq

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