Quantity   Component name
1 × LM741 Op-Amp
1 × 555 Timer
1 × BC557 - PNP Transistor
1 × LDR Resistor Networks / Thick Film Networks
1 × Potentiometer
1 × Buzzer
1 × LED Fiber Optics / Emitters
1 × Resistor (210, 1K, 5.7K, 100k, 1M)
1 × Capacitor (0.1uf, 10uf)