In this paper, we propose a low-cost transcranial alternating current neurostimulator wearable targeting frequencies in the theta wave band (4-8 Hz), which are crucial for the functioning of normal memory and attention. Prior work on transcranial stimulation indicates that modulating large-scale neural activity is achievable through both entrainment and resonance effects, by recruiting a larger population of neurons into task-relevant rhythmic firing networks. We conduct a simulation current density within the brain in response to the wearable, using SimNIBS, followed by experimental results of our board-level implementation with a test study of various electrodes, by connecting them to an impedance of 20 kOhms.