Quantity   Component name
1 × Texas Instruments LM741 Op-Amp https://lcsc.com/product-detail/General-Purpose-Amplifiers_Texas-Instruments_LM741CN-NOPB_Texas-Instruments-Texas-Instruments-LM741CN-NOPB_C13974.html/?from_code=PL201910298YQL
1 × 555 Timer https://lcsc.com/product-detail/Timer_HGSEMI-NE555N_C398063.html?from_code=PL201910298YQL
1 × BC557 - PNP Transistor lcsc.com/product-detail/Transistors-NPN-PNP_Foshan-Blue-Rocket-Elec-BC557-B_C358539.html/?from_code=PL201910298YQL
1 × LDR lcsc.com/product-detail/Photoresistors_JCHL-Shenzhen-Jing-Chuang-He-Li-Tech-GL5539A-60-80K_C11312.html/?from_code=PL201910298YQL
1 × Potentiometer lcsc.com/product-detail/Potentiometers-Variable-Resistors_ALPS-Electric-RK09K1130AAU_C202373.html/?from_code=PL201910298YQL
1 × Buzzer lcsc.com/product-detail/Others_S-S-SFN-12055PA6-5_C360607.html/?from_code=PL201910298YQL
1 × LED lcsc.com/product-detail/Light-Emitting-Diodes-LED_Everlight-Elec-313-2SYGD-S530-E2_C264310.html/?from_code=PL201910298YQL
1 × Resistor (210, 1K, 5.7K, 100k, 1M)
1 × Capacitor (0.1uf, 10uf)