schematic questions

[ed1380]

i scavanged though a TV and got me some stuff. now I'm looking through the datasheest to see what it is.

heres teh prob.

in teh attached pic it says
R1//R3
R2//R4


what does // mean? is it the same as / ?



and whats RL?

thanks

[Admin]

you forgot to link us to the KA278RA05 datasheet

RL is the load resistance.

For example, an mcu will have some internal resistance, and that will be the load. RL just represents whatever circuitry to attach to the voltage output.

R1//R3
R2//R4

=

R1/R3
R2/R4

basically divide, although I'm not sure why its // instead of / . . .

[ed1380]

i did attach SS of what i was talking about

thanks.


so can i just ignore RL?

[Darkbluestar]

In my EE (elecrical engineering) classes we often use the symbol || to stand for "in parallel with". So it is possible that whoever made this intended to use that notation. In which case (R1//R3)/(R2//R4) stands for the value of R1 in parallel with R3 divided by R2 in parallel with R4.

[ed1380]

what does "in parralel with" mean

how woudl i use it as an equation?

[Darkbluestar]

Two resistors in parallel like R1 and R2 can just be plugged into an equation (R1*R2)/(R1+R2).
You can read all about it here, http://en.wikipedia.org/wiki/Resistor#Series_and_parallel_circuits

[ed1380]

i think you might have hit the nail on the head. cause inside that IC there are 2 internal resistors.

thanks

[Darkbluestar]

you're very welcome