http://http://forum.allaboutcircuits.com/attachment.php?attachmentid=49083&d=1354159876What is the value of r1 and r2 and r3 which will let the op amp change when vin reach 35kv it will chang state from high to low and when the voltage reach 200 v it will change state from low to high(note the 4 kv is variable)
how can i do hyestresis for this circuit
http://forum.allaboutcircuits.com/attachment.php?attachmentid=49083&d=1354159876

 

Could you PLEASE, for ONCE, at least TRY to answer your own question and show SOME work, instead of expecting people here to be your no-effort-required-on-your-part answering service?

 

Well the voltage on pin 2 is 40 volts at 40Kv, and 2Volts at 2Kv, with the values of R4 & R5, so it will be 10Volts at 10Kv.

So it wont work!

 

Hi in this circuit i need my hestresis between 6 V and 1 so when vin is more than 6 v the vout will be low and when vin decrease and reach 1V vout will be high
so i did the calculation as following
i let R3=10K ohm
AND WHEN VIN REACH 6V I WILL HAVE
4v/R2+(15-6)v/R1=6v/10K ohm
AND WHEN VIN REACH ZERO
9v/R2-1v/R1=1v/10K ohm
AND I SOLVE THESE 2 EQUATION FOR GETTING R1 AND R2
MY QUESTION IS THIS TRUE AND IF I NEED MY HYSTRESIS FROM 6 VT 0V WHAT THE SECOND EQUATION WILL BE

 

Hi in this circuit i need my hestresis between 6 V and 1 so when vin is more than 6 v the vout will be low and when vin decrease and reach 1V vout will be high
so i did the calculation as following
i let R3=10K
AND WHEN VIN REACH 6V I WILL HAVE
4/R2+(15-6)/R1=6/10K
AND WHEN VIN REACH ZERO
9/R2-1/R1=1/10K
AND I SOLVE THESE 2 EQUATION FOR GETTING R1 AND R2
MY QUESTION IS THIS TRUE AND IF I NEED MY HYSTRESIS FROM 6 VT 0V WHAT THE SECOND EQUATION WILL BE

Thank you for finally showing some work! (Next perhaps you can work on using a meaningful thread title).

You equations look good, other than you obviously don't believe in tracking your units, which I harped about more than once. If you want any assistance from me in the future, you better use your units.

Without a negative supply someplace, you can't get a threshold of 0V. Even if you could, you could have problems getting enough overdrive to ensure that it transitions.

 

Hello,

I have merged the threads, to keep the things together.

Bertus

 

Thank you for finally showing some work! (Next perhaps you can work on using a meaningful thread title).

You equations look good, other than you obviously don't believe in tracking your units, which I harped about more than once. If you want any assistance from me in the future, you better use your units.

Without a negative supply someplace, you can't get a threshold of 0V. Even if you could, you could have problems getting enough overdrive to ensure that it transitions.

is my calculations is true

 

is my calculations is true

I think Wbahn wants you to rewrite it to, include units, to make the formula more readable. You need to do a better job at helping others to help you including providing as much information as possible and stop creating multiple threads on the same subject.

But these are common sense things that are common on almost any forum. They shouldn't need to be mentioned by other forum members, you should already know this.

 

I think Wbahn wants you to rewrite it to, include units, to make the formula more readable. You need to do a better job at helping others to help you including providing as much information as possible and stop creating multiple threads on the same subject.

But these are common sense things that are common on almost any forum. They shouldn't need to be mentioned by other forum members, you should already know this.

i write the units

 

As I said, the equations looked good, other than the units.

What steps, if any, have you taken to check your own work?

 

Hi takimon,

I hope your C stuf woks out.