Recent content by krispots

I'm designing a battery charger consisting of an LM317. The regulator will charge three batteries successively, for example, when battery 1 reaches a terminal voltage of 13.8, a voltage comparator will activate a relay that will switch on the second battery while switching off the switch for...

Homework Statement find y(t) = d(x(t))/dt where x(t) = 23sin(at)/(at) where a = 147*pi*2 Homework Equations The Attempt at a Solution y(t) = 23/a * [ (t^-1) * sin(at) ] = 23/a * [ -(t^-2) * sin(at) + (t^-1) * a * cos(at) ] is this correct? my derivatives are old and rusty.

your posts have been a great help!

so, attached here is the circuit i simulated. Vbat acts as the input to the four stages of the voltage level indicator. what will happen to the LM324 if for some reason the terminal voltage being measured exceeds 16.6V which is the supply voltage of the op amp? let's say a voltage spike of up...

That wraps things up for my problem. Thanks a lot!

so there is no real relationship between the input voltage and the output voltage other than the 3V difference? or is there some formula that relates the input voltage, output voltage, R1 and R2?

What will happen when the input voltages applied to the op amp is higher than its supplied voltage? Will it damage the op amp?

so, I'm taking up a course on electrical machine design and our professor gave us the equations for computing the different values required for a given specification. here is my problem: given these two equations: laD^2 = (W/N)(6.079x10^8)/(Byqr) --> eq. 1 and la = pi(D)(r)/(pK) --> eq. 2...

Thanks for pointing it out :smile:

Thanks for your help! the formulas and the schematic are starting to make sense now! one question though, how can you compute for the Iadj? you replaced it by 0.0001? how did you come up with the value?

hi, can anyone explain to me what does it mean when you say "charging at a rate of 0.1C" what does C means? are you charging at a rate of 0.1 coulomb per second?

hello uart, i based this simulation on this schematic found on the first page of the datasheet of LM317 http://www.futurlec.com/Linear/LM317T.shtml i don't know if the schematic there is probable, but I'm just testing for the simulation. thanks for your reply, i managed to solve the...

hello i'm new to using orcad capture 9.2 so I'm having problems with the simulation. i'm trying to simulate this regulator circuit using transient analysis. then when i clicked run, the green circle appeared. I'm wondering maybe you need to tweak something first on the parameters of the...