I have found this Yantra of Shreemati Durga-Devi on Scribd today, this Tantric Book - https://ru.scribd.com/doc/177696864/Yantra-Vidhan-Yogiraj-Yashpal
Amazingly beautiful design in pink-blue.
The end of the Book is devoted to the MahaYantra of Bhagavan Shree Vishnu:
The Hindi text says, that this is very ancient and extremely powerful (महाप्रभाव) MahaYantra of Bhagavan Shree Vishnu.
The Yantra destroys ominous Navagraha impact, scares away bhutas (ghosts and etc.) and eliminates scary dreams (if being stored under the pillow).
But the Yantra Itself must be read with "Shree Ram Raksha Stotra".
Besides The Mantra of Shreemati Sita-Devi and Bhagavan Shree Rama must be recited.
