“Optimization of DC Motor PID Control Using the Ziegler–Nichols Method with Encoder and Op-Amp (Lm324): Optimasi Kontrol PID Motor DC Menggunakan Metode Ziegler–Nichols Dengan Encoder Dan Op-Amp (Lm324)” (2025) Academia Open, 10(2), p. 10.21070/acopen.10.2025.12875. doi:10.21070/acopen.10.2025.12875.