Hello friends! Today we will design a regulated 5 V DC supply in Proteus using a 7805 regulator. We will connect the input, bypass capacitors, indicator and load, then calculate the current and heat so that the simulation becomes a useful starting point for hardware. A regulated supply is often the first circuit a project needs, but the required voltage depends on the actual components. Some circuits use 5 V, others 3.3 V or different rails. Batteries also come in many voltages; the original article's statements that all batteries are 12 V and all electronics operate at 5 V were incorrect. For this exercise, we will deliberately choose a suitable 12 V DC source and a modest 5 V load. The original diagrams and download remain below, with corrections to capacitor values and LED current limit ...