## What does (R1||R3) mean in a comparator equation ?

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Guyzz

I just saw || in a comparqator resistor calculation , what does that mean ?

Quote:

SINGLE-SUPPLY INVERTING HYSTERESIS:
VTL = (R1||R3)*VCC/((R1||R3) + R2) + (R1||R2) *VOL/((R1||R2) + R3)
VTH = (R1||R3)*VCC/((R1||R3) + R2) + (R1||R2) *VOH/((R1||R2) + R3)
HYST = V TH "“ V TL
HYST = (R1||R2)*(VOH "“ VOL)/(R1||R2 + R3)

/Bingo

R1 in parallel with R3 ?

Thanx :-)

/Bingo

Yes, that is a somewhat common notation for "parallel" borrowed from plane geometry.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

Just curious, is that notation not common anywhere else but the USA?

For explaining in text like that it is common.

SteveN wrote:
Just curious, is that notation not common anywhere else but the USA?

I've seen it a lot. I first thought unbelievable that someone has to ask what it means :)

Jepael wrote:
SteveN wrote:
Just curious, is that notation not common anywhere else but the USA?

I've seen it a lot. I first thought unbelievable that someone has to ask what it means :)

It could be that electronics isn't my primary occupation , but rather a hobby :?

/Bingo

Yes Jepael, come on. It is not that obvious what it means. Especially if you have not studied electronics or mathematics at university level, or have worked with electronics all your life.

I think it was a good question to get explained.

Agwanll, I did not mean to sound so rude as my post seems to be.
I guess I owe an apology to Bingo. Sorry.

And you are right, very good question to get explained, indeed.

Ok, good. :)