The document presents the development of a low-cost PC-based single-channel EEG monitoring system. It aims to design an analog circuit to reliably record electrical brain activity using affordable electrodes and provide raw EEG data for research purposes. The proposed system uses a combination of filters, an instrumentation amplifier, and Arduino for ADC to process EEG signals in the range of 10-100μV. The total cost is about 2071.5 Tk compared to commercial devices that cost over 8000 Tk with additional licensing fees, making raw data accessible for research more affordable.