Sri Ramanujamji has been giving discourses on the Upanishads at Premika Bhavanam.
The Sanskrit term Upaniṣad derives from upa- (nearby), ni- (at the proper place, down) and ṣad (to sit) thus: “sitting down near”, implying sitting near a teacher to receive instruction or, alternatively, “sitting at the foot of ..(teacher)”, or “laying siege” to the teacher. A gloss of the term Upanishad based on Shri Adi Shankara’s commentary on the Kaṭha and Brihadaranyaka Upanishad equates it with Ātmavidyā, that is, “knowledge of the Self”, or Brahmavidyā. Other dictionary meanings include “esoteric doctrine” and “secret doctrine”.
The Upanishads are considered the end of all the Vedas. it is the essence of the all the Vedas. Persistent listening to the Upanishads, ruminating and introspecting on it and can bestow Jnana (supreme knowledge) to the aspirant.
Sri Ramanujamji’s Upanishad lectures in Tamil are published for the listening pleasure of all its readers twice a month. The lectures are published on every Ekadasi day.
You may download or stream the lectures online.