whats wrong with thisw design

[xjackal]

how to solve proteus timestep too small

i mean why its not stable.this is a bmp file.it doesnt work with old proteus 6.2
but i realised that it works with new one?!!

 

[moda]

Hello,
This one looks like a comparator.

You have to use hysteresis, if not you can run into oscillation.

Regards

Moda

 

[xjackal]

can u describe it with details.yes the problem is with oscillation.while trying to change the sign of the voltage that is compared proteus gives a problem like:
timestep too small

 

[moda]

Hello,

Pleas read the :
**broken link removed**

read last 2 pages about hysteresis and simulation, I am sure that you can solve it.

Regards

Moda