Power Supply
A DC power supply was created using common electronics components. The power supply used a standard American line voltage as the input, and after stepping down the voltage in a transformer, three different topologies – a full wave rectifier, a linear regulator, and an amplifier – were used to ensure a constant output voltage of 5 – 10 volts, with a current of at least 0.5 milliamps regardless of the load resistance used. The circuit was successfully constructed on a breadboard, and was modeled using LTSpice CAD software. In order to accurately model the circuit in LTSpice, a custom transistor had to be programmed for the NTE2312 NPN transistor used in the circuit.