metron9

08-31-2006, 11:12 AM

I have found a site that has a schmitt trigger calculator and it shows the formula (Attached file)

Link to site: http://hyperphysics.phy-astr.gsu.edu/HBASE/electronic/schmitt.html#c3

Problem is, I never learned how to read the math symbols they are using so I am having a hard time converting this information to an excell spreadsheet format.

Can anyone help me understand it. I really do hat the fact that I usually gloss over the math examples in electronics books because I don't understand what is written on the page. I never got a chance to go to college.

I have tried

V2 = (((R1 * R2 * R3) / R2) * VREF) + (((R1 * R2 * R3) / R3) * VCC)

V2 = (((100 * 200 * 300) / 200) * 5) + (((100 * 200 * 300) / 300) * 5)

With R1=100, R2=200, R3=300, VCC=5 then V2 should = 2.272727 and I get 250,000

So I don't get what R1||R2||R3 is

From the math symbol table here: http://whatis.techtarget.com/definition/0,,sid9_gci803019,00.html

It looks like || means "The Product of" and from my 8th grade math education I think that means multiply

Why do they have to be so greek to me? http://forums.parallax.com/images/smilies/rolleyes.gif

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

Think outside the BOX!

Post Edited (metron9) : 8/31/2006 4:17:45 AM GMT

Link to site: http://hyperphysics.phy-astr.gsu.edu/HBASE/electronic/schmitt.html#c3

Problem is, I never learned how to read the math symbols they are using so I am having a hard time converting this information to an excell spreadsheet format.

Can anyone help me understand it. I really do hat the fact that I usually gloss over the math examples in electronics books because I don't understand what is written on the page. I never got a chance to go to college.

I have tried

V2 = (((R1 * R2 * R3) / R2) * VREF) + (((R1 * R2 * R3) / R3) * VCC)

V2 = (((100 * 200 * 300) / 200) * 5) + (((100 * 200 * 300) / 300) * 5)

With R1=100, R2=200, R3=300, VCC=5 then V2 should = 2.272727 and I get 250,000

So I don't get what R1||R2||R3 is

From the math symbol table here: http://whatis.techtarget.com/definition/0,,sid9_gci803019,00.html

It looks like || means "The Product of" and from my 8th grade math education I think that means multiply

Why do they have to be so greek to me? http://forums.parallax.com/images/smilies/rolleyes.gif

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

Think outside the BOX!

Post Edited (metron9) : 8/31/2006 4:17:45 AM GMT