Re: 3vdc motor PWM problem

Well, I changed the 1uF cap on the PWM circuit to a .1uF cap,
effectively decupling the frequency (and learning a new word in the
process).

The result? Success! I've been playing with this thing for hours, its
starting to get old, but was definitely worth all of the work.

The trick is to control the flow from the tube so that it drips at a
certain very specific rate.. any faster and it collapses into a stream.
Any less, and it doesnt drip at a constant rate. Luckily, thanks to
some property of water (surface tension I guess) this "drip zone" is
larger than the fluctations of the pump that would cause it to go into
one of the unstable configurations (too little drip, or a stream). Now
that the motor is running steady, the system is very stable.

Next step is to find out how to increase the liquid's surface tension
so I could increase the drip rate without getting a stream, and form
larger drops.

Thanks again for your help, everyone!

.

Relevant Pages

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  • autodrip
    ... I remember a drip drip ... but it never became a stream ... going into perry's chemical engineering handbook ... it had to cool because of the gas gas gas ...
    (rec.arts.poems)