# Hyestresis problem

Discussion in 'General Electronics Chat' started by TAKYMOUNIR, Nov 28, 2012.

1. ### TAKYMOUNIR Thread Starter Active Member

Jun 23, 2008
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Last edited: Nov 30, 2012

Mar 31, 2012
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3. ### Dodgydave Distinguished Member

Jun 22, 2012
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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!

Last edited: Nov 29, 2012
4. ### TAKYMOUNIR Thread Starter Active Member

Jun 23, 2008
351
1
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

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Last edited: Dec 1, 2012
5. ### WBahn Moderator

Mar 31, 2012
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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.

TAKYMOUNIR likes this.

Apr 5, 2008
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Hello,

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

Bertus

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7. ### TAKYMOUNIR Thread Starter Active Member

Jun 23, 2008
351
1
is my calculations is true

8. ### spinnaker AAC Fanatic!

Oct 29, 2009
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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.

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9. ### TAKYMOUNIR Thread Starter Active Member

Jun 23, 2008
351
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i write the units

10. ### WBahn Moderator

Mar 31, 2012
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As I said, the equations looked good, other than the units.

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

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11. ### takao21203 Distinguished Member

Apr 28, 2012
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Hi takimon,

I hope your C stuf woks out.