how to set the resistor for vo

[wei9321]

as the picture,If vo1=5v,v02=24v
how to set the R1,R2,R3,R4?

 

[srizbf]

what is the voltage across anode-cathode of tl431 reqd?

information is missing.

srizbf
19thmay2010

 

[wei9321]

sorry,I amend it !

 

[srizbf]

what is the purpose of the ckt?

if a Vo1 or Vo2 is available then the led is to be lit up?

if so applying Vo1 also for led power?.

and to me the ckt looks like combining two requirements.

i may be wrong.

if that is not correct please correct me .

srizbf
20thmay2010

 

[wei9321]

as the second picture,my purpose is to acquire the dual vout

 

[srizbf]

acquiring vout .. sorry i am not clear.

seeing the new image ,
i deduce that if both Vo1 and Vo2 is available ,
then led is on.( a sort of indication that Vo1 and Vo2 is ok?)

what do you want the led status when Vo2 is not at reqd voltage?

(or) give a truth table form for i/ps Vo1 and Vo2 and o/p led status.

srizbf
20thmay2010