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Yes, you could create an oscillator with a single transistor. But in the design I referenced, the oscillator is a standard push - pull design. The frequency is determined by the inductor and capacitors used. The webste Basics, Introduction, Calculation, Theory,PCB DIY Kit RF Push-Pull MOSFET...
See **broken link removed** the "2 stage time delay circuit" for the basis of a timer I would use in your application, where you need to set an accurate delay time for catching water drops.
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