Hello ,
I;m trying to make a battery tester , the voltage is 12<Vb<9
I want to understand how to do this
I have read what is writing here
http://forum.allaboutcircuits.com/showthread.php?t=35567
very helpful,
but I didn't understand how to calculate the R3 for the lower voltage
what is the formula ?
I understand that for the High end this is what I need
R2=10K , R1=1.21K
according to this:
Vmax=1.25(1+R2/R1) -
where R1 connected between PIN7 and PIN8
R2 connected between GND and R1
like shown in the datasheet Figure 1
any help will do
Thanks ,
I;m trying to make a battery tester , the voltage is 12<Vb<9
I want to understand how to do this
I have read what is writing here
http://forum.allaboutcircuits.com/showthread.php?t=35567
very helpful,
but I didn't understand how to calculate the R3 for the lower voltage
what is the formula ?
I understand that for the High end this is what I need
R2=10K , R1=1.21K
according to this:
Vmax=1.25(1+R2/R1) -
where R1 connected between PIN7 and PIN8
R2 connected between GND and R1
like shown in the datasheet Figure 1
any help will do
Thanks ,