The books called יחוה דעת were authored by Rabbi Ovadya Yosef. In the title page, it states that these books are essentially transcriptions of a radio show called פניני הלכה, with small additions. Are these radio shows available for listening? I’ve been unsuccessful in finding them thus far.
The Shiurim from Rabbi Ovadia Yosef were from פינת ההלכה that were played on 'רשת א of רדיו קול ישראל. Although to the best of my knowledge I am not aware of all the Shiurim being available, you can obtain many Shiurim from Rabbi Ovadia Yosef on Halachic issues at this link.