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A project log for The (analog) 1Hz sinewave generator

The most ridiculous, overengineered, stupid way to create a 1Hz sinewave using OP-amps ..... (and a timer)

phil-weaselPhil Weasel 08/19/2025 at 14:520 Comments

Last hour of the contest, time to recap.

Well it works ... kinda. Adding many "im scared potentiometers" really wasnt the brightest of my ideas. Also the lack of testpoints made things just harder.

Remember kids: TEST POINTS ! LOTS AND LOTS OF TESTPOINTS !

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After much much tweaking i got it to self adjust over a long ~2min period of time. Using 1-Meg pots was stupid. Once you got one parameter sorta right just a little mistake and the values are all over again. It worked once, but replicating it again for documentation, would take too long. The pots and lack of points made it hell to debug. Deadline is approaching.

The screenshots from the last log must be enough.

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Well it was a fun experience, learned a thing or two about opamps, control loops and PLL´s so it was worth it.

I will stop the project here because it was solely for the contest and has no real use while being a crazy timesink.

If i would redo it sometime i would directly use a NE555 squarewave and apply the shaping.

See you on the next contest.

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