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The largest Electronic Circuits Database on the Net

Doorbell Circuits

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Electronic Music Maker

This electronic music maker uses an astable oscillator circuit that is controlled by a photocell. The light falling
Electronic Doorbell Circuit

When the doorbell switch is pressed, the two monostable stages are activated in sequence, applying bias to a pair of voltage-controlled resistor stages. These then modulate the outputs from a pair of tone generators. The resulting signals are fed to an audio amplifier,
Twin Bell Circuit Circuit

It is often desirable for a single doorbell to be operated by two buttons, for instance, one at the front door and the other at the back door. The additional button, S2 in series with the break contact of relay Rel, is connected in parallel with the original bell-push, SI. When S2 is pressed, the bell voltage is rectified by D1 and smoothed by CI. After a time, t = R{R2C2, the direct voltage...
Electronic Door Buzzer

When SI is depressed, an initial positive voltage is placed on C2 and the noninverting terminal of Ul. The circuit o
Two-Door Annunciator

When the pushbuttons at either door are depressed, this circuit generates a different tone for each door. Tones are ge
Single-Chip Chime

This circuit uses only one IC, produces a pleasant tone, and sports a single control for adjusting the tone"s chiming rat
Tone Doorbell circuit

When the door is pushed, you hear a whisper that "slide up" to a higher frequency. The oscillator frequency is determined by AF coupling capacitance, C 1 and the value of the resistor connected between the base of IQ and the earth. This resistance, RBG is equal to (Ri + R2) RJ. First, suppose that 51 is closed and R2 have been adjusted to produce a pleasant, low frequency tone. The capacitor C3...
Musical Doorbell

8 to 15 Vac is applied to terminals C and D, which produces a dc voltage across R2, and turns on Ql. This connects the bat
Door chimes delay

With values shown, this simple circuit will permit one operation every 10 seconds or so. Capacitor C1 charges through Rl when the button is released
Percussion electronic doorbell 1

The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit consists of piezoelectric ceramic BC, amplification tube Vl, resistors Rl and R2 and capacitor Cl and so on..
polyphonic doorbel
doorbell of two tones
Recordable electronic doorbell

The recordable electronic doorbell is composed of the recording and playback integrated circuit IC, resistors Rl-R6, capacitors Cl-C4, microphone BM, speaker BL, control buttons Sl, S2, battery GB and LED VL, and it is shown in Figure 3-123. Rl-RS select 1/4W metal film resistors or carbon film resistors; R6 select the lW metal film resistor. Cl-C4 select mo..
Remote Doorbell Warning Switch

This circuit will light a lamp at a remote location when the doorbell switch is pressed. This circuit should only be used with the solenoid type doorbells, the electronic type that play tunes will not work here. It is quite easy to miss the sound of a doorbell if you are watching TV, this circuit gets round the problem by providing a visual indic
3 in one doorbell

The circuit comprises the power supply which is formed by TR1, Q3, D13, Q1, D9 This supplies both the 12 volt rails and the five volt rails for the micro which i..
Electronic Doorbell Light Schematic

This 6V battery operated doorbell light circuit can be connected in parallel with any existing AC230V doorbell. When anyone push the doorbell switch, the bell sounds as usual and ac mains supply available across the doorbell is routed to th..
Crank Doorbell Circuit Schematic

Here is an interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555) is wired in monostable mode to produce a time out o some seconds. The output of t
musical doorbel
Doorbell MemoryCircuit

If you re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whethe..
2 Tone Door Bell

2 Tone Door Bell here published is verified project produce ding-dong sound circuit diagram of 2-tone door bell with description.various door bell and alarm project .
using doorbell circuit control things radio control
electronic doorbell using UM3481

The heart of this circuit is the UM3481 IC which can be powered by a 1. 5 volts battery and can be used for electronic doorbell, toys, melody clock, music box, etc. The UM3481 IC is designed to play the melody according to the previously programmed information and is capable of generating 16 songs with 3 instrument effects : piano, organ and ma
Musical Doorbell Circuit

In many cases, a doorbell that sounds off a musical tone is preferable over the common buzz sound. This featured circuit is a musical doorbell. After the b..
Three-tone electronic doorbell 2

The three-tone electronic doorbell circuit consists of the coding triggered circuit, multi-tone generator and audio amplifier circuit, and it is shown in Figure 3-110. Coding trigger circuit is composed of the buttons Sl-S6, two four-input AND gate (DI, D2) integrated circuit ICI, resistors Rl-Rll and transistors Vl-V3 and so on. Multi-tone sound generator c..
Three Flashing LED Doorbells For The Hearing Impaired
Crank Doorbell Circuit Schematic

An interesting hobby circuit of a crank door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555) is wired in monostable mode to produce a time out o some seconds. The output of t
Politely welcoming electronic doorbell

The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell button S, magnetic switches SA, transistors V4, V5, resistors R3, R4, R6, diodes VD2, VD3, and capacitor..
Doorbell with IC555

All components arranged as in the picture sequence below. Current will flow starting from the sourcevoltage and to the switch. When the switch is closed current will flow through the diode, wherediode serves as a switch is closed because it was given forward bias (anode diode is givenpositive voltage and the cathode is given a negative voltage). F
Doorbell Memory

If you`re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone rang while you were out. Of course, you can`t tell whether it was the visitor you were expecting who dropped by then, but a call to the mobile phone of the person concerned can quickly
Doorbell circuit using NE555 IC

The main part of this circuit Doorbell two timer NE555 ICs. When someone hit the switch S1 momentarily, the speaker emits a sound of the bell, if the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is enabled in your pin 2 and pin 3 output is high for a period of time previously set by the values of R4
Circuit Project: Wireless Doorbell

You cannot beat the Chinese. The project described in this article is a ready-made item from a $2.00 shop! And it is made in China! It is a wireless doorb..
Ding-dong electronic doorbell

The ding-dong electronic doorbell circuit is composed of the power supply circuit, trigger control circuit, audio oscillator output circuit, and it is shown in Figure 3-125. Power supply circuit is composed of the power transformer T, rectifier diodes VDl-VD4 and filter capacitor Cl. Trigger control circuit is composed of the doorbell button, cont

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