Re: splitting voltage

OK everyone, thanks so much for your input. I've put in so many hours
to this project and just want to see it finished. You all are a great
help.



So as I understand, here's what needs to be modified from the
schematics (please let me know if anything is wrong):

- I'm going to keep the power supply at 4x AA batteries, since the 555s
require 4.5v.
- I will add .01uF caps on each 555 going from pin 5 to ground (I still
don't get what this does.. won't the capacitor just charge up and then
sit there charged?)
- The diode parallel to the motor will be an n4001, (is this the
correct diode?)
- Change the resistor values on the 555 timer that controls the motor
to represent about 40% duty cycle at 100Hz [I'll experiment with this
to find correct values]. Read below to see why 40%.



And here are things I'm not sure about:

- Adding a 100uH inductor where? From + rail to the joint just above
the motor?
- Adding diodes to the 555 timers. From + rail to pin 1? n4001?
- Connecting pin 4 to +. Whats the advantage?



More about the 3v motor: When connected purely to 2 C batteries (as it
was designed to do), it pumps a small stream of water about a foot up.
However, this stream of water is too much for what I need it for... my
specs call for an even tinier stream of water. Ideally, I'd like to be
able to control how much water is flowing, which is why I'm opting for
the PWM solution, so I can effectively control the voltage, and as a
bonus get to use another potentiometer that controls something. Since
3v is too much, I'd like to try around 2 - 2.8 volts, just enough to
barely pump the water up. So I'm thinking roughly 40% duty cycle should
do it.

I just purchased an assortment of diodes and a couple .01uF caps, so
I'm all set except for the inductor, which I'm hoping won't be needed
since I don't understand where to put it and what it would do. I will
put together everything tonight and post results.

Again, thanks a lot everyone (especially Default)

-Sam

.

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