Design files and validation data for: Ultra-low-cost Single-JFET Bioamplifier for Smartphone Audio Input

Design files and validation data for the ultra-low-cost single-JFET bioamplifier described in "Ultra-low-cost Single-JFET Bioamplifier for Smartphone Audio Input: Applications in ECG, Seismocardiography and Low-amplitude Electrical Signal Acquisition" (submitted to HardwareX). Files include: circuit schematic (Figure 1), photograph of the physical device prototype (Figure 2), representative surface ECG recording (Figure 3), seismocardiogram recorded via piezoelectric sensor (Figure 4), and damped LCR oscillation waveform demonstrating electromagnetic robustness during high-voltage discharge (Figure 5).