Very simple project ran smooth virtually, but real prototype does not.

In meantime...

Hi Vahe:  The LT1819 should not be used as a comparator.  Here is text from the data sheet;  "Sustained differential inputs, however, will result in excessive power dissipation and therefore this device should not be used as a comparator."

Depending on gate capacitance and speed required, I would suggest using a comparator for this task.  An LT1713 would do well, as it can be supplied with 10V.  Or if speed is not required, an LT1716 might do it (very weak pullup).

Dear Glen, thank you, thank you and once again, thank you.

You have solved a head destroying puzzle for me.

Hello Glen. I did another mistake and have immediately ordered (non-cancelable) at arrow.com which was the only Co. that has stock. As it seems, the LT1713 being good choice at first instance, requires 2 supply rails. Can I leave the ground floating and connect the "Minus" rail to ground, making single supply +10V? If floating GND is not a way, could be the synthetic ground, build up from serially connected capacitors, from rail-to-rail play role of ground just for comparator chip? Next to this chip will be connected a mighty driver-DEIC420. It is out of production since IXYS acquisition by LittleFuse, but has not an equivalent alternative for given project. The minimal threshold of high level is 7V for DEIC420 input port.

Vahe, the LT1713 is rated for single-supply operation.

• Rail-to-Rail Complementary Outputs (TTL/CMOS Compatible)
• Specified at 2.7V, 5V and ±5V Supplies

A quick look at the datasheet shows an example on the first page.

Vahe, the LT1713 is rated for single-supply operation.

• Rail-to-Rail Complementary Outputs (TTL/CMOS Compatible)
• Specified at 2.7V, 5V and ±5V Supplies

A quick look at the datasheet shows an example on the first page.