Circuit 1: Production of simple voice-activated flash 
Circuit 2: Production of a music doorbell 
Circuit 3: Production of Multi-Function Alarm 
Circuit 4:: Making of the metronome 
Circuit 5: Production of automotive turn signal circuit 
Circuit 6: Production of sound and light control lights 
Circuit 7: Production of an infrared remote control detector 
Circuit 8: Pillow edge LED convenient lamp production 
Circuit 9: Production of touch memory switch: 
Circuit 10: Fabrication of a voice-activated flash multivibrator circuit 
Circuit 11: Love pattern water lamp 
Production of circuit 12:555 multivibrator 
Circuit 13: Production of light control alarm 
Circuit 14: Production of hearing aids 
Circuit 15: Production of Mailbox Reminder 
Circuit 16: Production of baby bedwetting reminder 
Circuit 17: Furnace flameout alarm 
Circuit 18: Production of an electronic mnemonic 
Circuit 19: Design and fabrication of light-controlled street lamps 
Circuit 20: Production of LM317 adjustable regulated power supply 
Circuit 21: Fabrication of a regulated power supply circuit with a fixed output voltage 
Circuit 22: Fabrication of a Complementary Tube Oscillator 
Circuit 23: Simulation of the "know" circuit 
Circuit 24: Fabrication of a Multivibrator 
Circuit 25: Production of an air defense alarm 
Circuit 26: Production of TDA2822 hearing aids 
Circuit 27: Production of a simple photometer circuit 
Circuit 28: Production of a simple light control circuit 
Circuit 29: Production of LED Night Lights 
Circuit 30: Production of an electronic bird 
Circuit 31: Production of LED cycle lights 
Circuit 32: Production of the Welcome 
Circuit 33: Production of a simple water tower water level alarm 
Circuit 34: 555 water level control circuit 
Circuit 35: Capacitor charge and discharge experiment 
Circuit 36: Fabrication of LED Level Indication Circuit 
Circuit 37: Potentiometer Dimming Circuit 
Circuit 38: Positive and Negative Voltage Converter Circuit 
Circuit 39: DC Electronic Circuit Breaker 
Circuit 40: Constant Current Ripple Attenuator 
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