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

  • New Circuits

    .

     


    Popular Circuits

    Summing-amplifier-clamping-circuit
    Infrared intrusion barrier
    Homebrew tapeless camera
    c programming tutorial setup
    12vdc 220vac inverter
    SCR Protection Circuits
    Serial DRAM non voltizer
    32kHz clock oscillator circuit



    Top