Electronics > Beginners

Precise and stable ULF oscillator

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atmfjstc:
I'm more curious about the OP's application. What use could one have for a 7Hz square wave? Doubt it's for audio - it would sound like crap. Drive a LED or a solenoid? Then why worry about the harmonics?

unitedatoms:
1. Miniature device for bridges demolition
2. Standing wave actuator for liquid mercury tank for gold mining industry
3. Acoustic emitter for subliminal fear in crowd control situations
4. Ikea furniture flexibility demo setup

Circlotron:
https://en.m.wikipedia.org/wiki/Schumann_resonances

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