Intelligent fire alarm telephone alarm circuit - finger circuit

Posted on Mar 28, 2007

Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice detection and alarm circuit, telephone interface circuit, power supply circuit and th

Intelligent fire alarm telephone alarm circuit - finger circuit

Click here to download the full size of the above Circuit.

e keyboard display circuit. (1) automatic dial-up alarm is not only part of the MT8888 chip DTMF signal transceiver function, and having a telephone tone detection function can, it can be easily and MCS51 series microcontroller interface. In this system, MT8 and external circuit shown in Figure 13-41, its reception section points using a single-ended input by Rz0 1, R2U2 and C20i composition, its transmission portion Rs, R206, G shad, Ck and XTAL2 composition, its control system composed of a portion R2c3, Goi. Since the IRQ and CP output terminal is open source, so use the pull-up resistor R204. C203 decoupling capacitors. DTMF and DTMF OUT IN connected to the telephone interface circuit.

Leave Comment

characters left:

Related Circuits

alarm using PIC16F628-04

This article describes a 2-Input alarm developed on the PIC LICK-1 Module using a Microchip PIC16F628-04. The program uses the internal 4MHz oscillator and if any other frequency is used, the...

Low-volts alarm

This inexpensive dc supply-voltage monitor sounds a warning when the voltage falls below a preset value. It is ideal for monitoring rechargeable batteries since it draws only a few microamperes...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....