Single Chip Memory Call Bell
After publishing various doorbell project in www.electronicsproject.org by innovative group Dreamlover Technology design a simple, cheap and as well as unique memory call bell. It is unique because it tell us whether any guest come or not in absence of us too.
Circuit description
The entire circuit single chip memory call bell is designed around CMOS quad 2-input NAND gate IC CD4011 (IC1). The two gate of this IC is configured as RS flip-flop which further formed two complementary – output. When switch SW1 is pressed the output of flip-flop is changed and LED1 glow up. The third gate of IC1 combined with diode D1 and capacitor C1 to generate music tone. Transistor T1 is used as single stage buffer amplifier. Switch SW2 is used to reset the circuit.
PART LIST
Resistors (all ¼-watt, ± 5% Carbon)
R1, R2= 10 KΩ
R3 = 100 Ω
Capacitors
C1 = 220 µF/10V (Electrolytic)
Semiconductors
IC1 = CD4011 (CMOS quad 2-input NAND gate)
D1 = 1N4148
T1 = BC147
LED1 = RED
Miscellaneous
SW1, SW2 = Push-to-on switch
LS1 = Piezo Buzzer
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sir give me one low cost circuit door bell if any one touch my doorbell switch then i can see hes face in my tv or comfuter in my mail thankyou