The requirement for a stable DC output in applications such as body area network (BAN) devices, medical equipment, and auxiliary power supplies in all electronic circuits is crucial to stopping device damage. Many integrated circuits (ICs) that require signals to function also need a biasing voltage to power themselves for medical device applications. For this, the development of efficient AC-to-DC converters is our most preferable choice due to the non-availability of direct DC. This paper presents the design and implementation of an auxiliary power supply for applications including medical device auxiliary power supply and IC biasing. The proposed system aims to develop both positive and negative DC voltage (ranging from ±3.3 to ±15 V) simultaneously, allowing for flexible usage based on specific requirements. Key features include a compact size, high efficiency, and stable DC voltage with minimal ripple, even under varying load conditions. The design methodology and practical implementation—including PCB (Printed Circuit Board) design—are explained in detail, and experimentation is conducted to validate the design. Additionally, a case study on the TLP250 gate driver circuit is performed experimentally with the developed DC supply. This paper offers valuable insights for researchers in the field of power electronics. The compact design and prototyping for industry use can be considered as a future scope of this paper.