Summary Direct‐current (DC) voltage source is an essential part in many occasions such as integrated systems and laboratory electricity, which can provide a stable and continuous voltage supply. Traditional voltage sources are frequently designed by bipolar junction and field effect transistors. Compared with these devices, memristors have lower power consumption and smaller size. At present, memristors have been used in the design of logic circuits and other functional circuits, which could provide a new idea for applying memristors into the design of DC voltage sources. In this paper, a memristor‐based circuit design of continuously adjustable DC voltage source is proposed for the first time. The proposed DC voltage source circuit only consists of two modules and has a simple structure. In addition, the output voltage amplitude of this voltage source can be continuously adjusted by the application of a control signal due to the utility of the memristor. The operation process of the whole circuit and the mathematical model between the input and output are analyzed in detail, which is greatly beneficial for use and expansion. Finally, the effectiveness of the circuit is verified in PSPICE, and the accuracy of the output amplitude of the voltage source is also investigated.

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