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Neat idea to use a bucket of water and a pump instead of using water mains. This way any problem will be limited to water in the bucket. A small amount of Miracle grow ought to be a great fertilizer too. I'm gonna try it next spring
Good app and will work well with DC motors. I've used this circuit for several years for another application . The graphic of PWM is a little misleading though because it does not apply to this circuit design. In this circuit, the modulation is a fixed width of one polarity as set by the potentiometer not variable during the "firing" as shown the sine wave example.
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