Re: splitting voltage


James Thompson wrote:
"randomname" <randomname12345@xxxxxxxxx> wrote in message
news:1156309110.350656.64960@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
hello everyone.

ive been working on a project for awhile, and im so close to completion
exception for one little problem. im trying to power a small DC motor,
as well as about 20 3mm LEDs, but am running into timing issues when
the pump is powered.

the circuit is:

a 555 timer, whose frequency is around 30Hz; most of the time the
output is +, when it is - its only for an extremely short amount of
time (its a strobe light, basically). the output of this timer goes to
20 parallel 3mm LEDs to positive (no resistor, since theyre not on for
long enough to burn). just to be clear, to output of the 555 is:

++++++++++-++++++++++- (at about 30Hz). when it's -, the LEDs go on.

this works fine, until the second part of the project is introduced.
id like to run a small battery powered water pump (it takes two 2x C
batteries) but I'd like it to run on the power supply of the
aformentioned circuit (4x AA batteries). im not quite sure how to do
this. the "pump" is just a small DC motor about an inch in diameter.
i do not know the amperage rating of it.

i wont even go over what i tried at the risk of sounding like a fool.
whats the best way to run both the motor and the 555 timer + LEDs?

thanks a ton,
-sam

Just solder a tap at the halfway part of the battery holder to run the
motor. Also why not switch the battery hold to use all C cells unless space
is an issue.

thats a good idea, however the battery holder is a weird rectangular
prism shape. plus, id like to learn about how to do this.

- -
| |
resistor 555
| | [pin 3]
motor LEDs
| |
+ +

when I connect the motor, the LEDs will flicker much faster and dont
hold a steady brightness. why would this cause the 555 timer to
oscillate faster and sporadically? im confused.

-sam

.

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