

Wireless controlled Door-bell
Now day’s wireless control of appliance is in practice, because of its advantage like no wire is needed, multiple controlling is less complicated. By considering these all, the innovative group Dreamlover Technology designed and verified the circuit of wireless Doorbell. The controlling range of wireless doorbell is 100M.
Circuit Description
As the wireless doorbell is wireless based project, it is divided into two major section i.e. transmitter and receiver.
Transmitter:- This transmitter section is designed around oscillator transistor (BF194B) T2 followed by two transistor (BC148) T1 and T3. Transistor T2 generate special radio frequency determined by trimmer (variable capacitor) and coil. Transistor T1 is used as pulse generator. The output from transistor T3 is given to emitter of transistor T2 in order to get radio frequency from its collector. Trimmer VC1 is used to adjust the transmitter frequency.
Receiver: - The receiver section is further divided into two main sections i.e. RF amplifier section and bell trigger section.
An aerial is used to receive the transmitted frequency from remote which is further amplified by amplifier and trigger circuit. The whole receiver circuit utilizes seven transistors. Transistor T4 get frequency from hand unit and further send to tuned circuit made from capacitor C6 and coil L2.
Transistor T5 is used as comparator which further send amplify voltage to capacitor C11 for filter. The filter voltage is passed through detector stage i.e. rectify and given to base of transistor T6. Transistor T6 is adjusted in amplifier mode for amplifying the signal voltage.
The amplified voltage from transistor T6 is given to base of transistor T7, used in complementary mode. The positive voltage at collector of transistor T7 let transistor T8 in conducting state and T9 in non- conducting state. The positive voltage available at collector of T9 is given to base of transistor T10. Transistor T10 is used here in blocking oscillator mode which further produces bird sound combining with output transformer.
PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon) |
R1 = 100 Ω R2 = 330 KΩ R3 – R5, R10, R25 – R27 = 2.7 KΩ R6, R18 = 47 KΩ R7 = 33 KΩ R8 = 100 KΩ R9, R24 = 22 KΩ R11, R19, R28 = 1 KΩ R12, R21 = 15 KΩ R13 = 470 KΩ R14, R16 = 1 MΩ R15, R22, R23 = 10 KΩ R17 = 8.2 KΩ R20 = 4.7 KΩ R29 = 4.7 Ω R30 = 100 Ω R31 = 27 KΩ |
Capacitors |
C1, C3, C8 = 0.001 µF (Ceramic Disc) C2 = 0.022 µF (Ceramic Disc) C4 = 100 pF (Ceramic Disc) C5, C13 = 0.02 µF (Ceramic Disc) C6, C7 = 3.3 pF (Ceramic Disc) C9 – C11, C17 = 0.002 µF (Ceramic Disc) C12 = 220 µF/25V (Electrolytic) C14, C18 = 0.04 µF(Ceramic Disc) C15 = 22 µF/25V (Electrolytic) C16 = 100 µF/16V (Electrolytic) VC1, VC2 = 100 pF (trimmer) |
Semiconductors |
T1, T2, T6, T8, T9 = BC148 T3 = BF194 T4 = BF195 T5, T7 = BC158 T10 = BEL187 D1 = 1N4446 |
Miscellaneous |
L.S. = 8 Ω speaker X1 = O/P transformer LED AERIAL = 2 L1 – L4 = coil |
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hi
what is the value of the inductance?
thanks
please if u did the project can u send me what values did u use?
doobell coil deetails
doorbell coil deetails
doorbell coil deetails
and more details about the transformer plz
Transformer in output is simple audio transformer
Perhaps we can use a UM Chip for melody generator and avoid the last 4 transistor stages , reducing component count
Can any1 tell me how remote control doorbell wrks, I understand the wireless part-u put doorbell on door, thn receiver in hm, so wht does the remote control do?
doorbell coil deetails
hi what is the resonant frequency. thanks
I am unable to see the whole writeup….right part is getting cut…. :/
i want to fin door beel with 2 sound and made with 5 transistors and 6 capacitor an 7 resistance if u give me layout i m thankfull to u ……
what is the value of inductance coil? plz reply fast
pls help me with value of inductor and transformer and zener diode
The transistors are not available in the market which transisters can be used in place of them ?
Pls send the Input,Output & rating of Transformer
dear sir can we use this circuit as a walkie talkie?plz give modification.thanks sir.
Can you please provide more details about the two antennas and the four coils?
wat the coils siz
l1- l4 coil deetails
doobel coil deetails
doobel coil deetails
by using five wireless door bells,how can we identify who buzzered the bell.
hai likes that project
I seriously like the circuit man