who likes math?

[YOyoYOhowsDAjello]

Oh, and I hate this Electrical BS. I was in EE until last summer when I decided I didn't want to spend my life doing this crap... or stuff related to this crap.

 

[TuxDave]

Originally posted by: hevnsnt
Here is the equation.

F =

1.4
-----------------------------
(R1 + 2R2) × C1

I want my F= 10
R2=100k
C1=.47


See this link "555/556 Astable" I want a 10Hz timer.

You're telling me you have a .47F capacitor just hanging around? Exactly what are you building here???

 

[YOyoYOhowsDAjello]

Originally posted by: hevnsnt

Originally posted by: YOyoYOhowsDAjello
Do you want T = 10 or F = 10?

if T= 10, then R1 = 98062.5931446

I want F =10

well... then you get a negative resistance for R1.... but I guess that could be right heh

So you don't want the period to be 10 seconds, you want the period to be 1/10 second?

 

[ActuaryTm]

Originally posted by: russianpower

Originally posted by: ActuaryTm

Originally posted by: russianpower

By review, I did mean "review, and learn from your mistake".

That may have been unclear.

(14.2 X 2.5 X 3)X 19.3=2055.45

That is still incorrect (actually, it's not even close), and is meaningless without a unit attached.

 

[TuxDave]

Originally posted by: ActuaryTm

Originally posted by: russianpower

Originally posted by: ActuaryTm

Originally posted by: russianpower

By review, I did mean "review, and learn from your mistake".

That may have been unclear.

(14.2 X 2.5 X 3)X 19.3=2055.45

That is still incorrect (actually, it's not even close), and is meaningless without a unit atteached.

I'm 99% sure that he messed up his units. I betcha he forgot to mention that it's 0.47*10^-6 for 0.47uF or something like that.

 

[hevnsnt]

Originally posted by: TuxDave

Originally posted by: hevnsnt
Here is the equation.

F =

1.4
-----------------------------
(R1 + 2R2) × C1

I want my F= 10
R2=100k
C1=.47


See this link "555/556 Astable" I want a 10Hz timer.

You're telling me you have a .47F capacitor just hanging around? Exactly what are you building here???

LOL.. Ok
hahaha
.47uf (my fault)

 

[YOyoYOhowsDAjello]

Originally posted by: TuxDave

Originally posted by: hevnsnt
Here is the equation.

F =

1.4
-----------------------------
(R1 + 2R2) × C1

I want my F= 10
R2=100k
C1=.47


See this link "555/556 Astable" I want a 10Hz timer.

You're telling me you have a .47F capacitor just hanging around? Exactly what are you building here???

ZAP!!!!!

 

[ActuaryTm]

Originally posted by: TuxDave
I'm 99% sure that he messed up his units. I betcha he forgot to mention that it's 0.47*10^-6 for 0.47uF or something like that.

Agreed (it happened several times in that thread, actually), and I would hate to see it continue, especially if he/she enjoys mathematics in general.

Edit: On second review, no. The units are the problem, but not that they were left off - they were essentially ignored, and in the end produced an (several) incorrect answer(s).

 

[TuxDave]

Originally posted by: hevnsnt

Originally posted by: TuxDave

Originally posted by: hevnsnt
Here is the equation.

F =

1.4
-----------------------------
(R1 + 2R2) × C1

I want my F= 10
R2=100k
C1=.47


See this link "555/556 Astable" I want a 10Hz timer.

You're telling me you have a .47F capacitor just hanging around? Exactly what are you building here???

LOL.. Ok
hahaha
.47uf (my fault)

Then the answer is roughly 98K

 

[YOyoYOhowsDAjello]

97872.3404255

end of thread

 

[hevnsnt]

Originally posted by: YOyoYOhowsDAjello
97872.3404255

end of thread

thanks all.. Sorry for the stupid mistake.

 

[artikk]

14.2 X2.54=36.068^3=46920.88371 X 19.3 =905573.0555 grams=905.573 kg
19.3 g/cm3 = density

finally got it. thanks actuary tim.:thumbsup:

 

[edro]

If you can't solve for R1... you better be either out of school for like 20 years, or only in 5th grade...

Is this an electronics problem? R1 sounds like resistor 1...

 

[ActuaryTm]

Originally posted by: russianpower
14.2 X2.54=36.068^3=46920.88371 X 19.3 =905573.0555 grams=905.573 kg
19.3 g/cm3 = density

Much better, and ultimately correct.

 

[screw3d]

Can't believe no one mentioned 42 yet

 

[YOyoYOhowsDAjello]

Originally posted by: edro13
If you can't solve for R1... you better be either out of school for like 20 years, or only in 5th grade...

Is this an electronics problem? R1 sounds like resistor 1...

did you read any of this thread?