Loud ringer for phone using KA2411


Posted on Feb 5, 2014

This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. The detect ringing signal tone circuit with light and sound. It is easy to use and good quality, Do not enter


Loud ringer for phone using KA2411
Click here to download the full size of the above Circuit.

the power supply. Which as Detect ringing signal tone circuit Or ring tones on the telephone line, a signal incoming calls. When an incoming call, When an incoming call, The C1, C2, will act as a coupling signal AC Volt to diodes D1, D2. Signal voltage is reduced down to approximately 10V. By D2 to detect, only a negative signal, One extreme to the other end of the wire loop. The D1 detect a positive signal, and the 4 LED. Flashing light attached to it, with frequency of the ringging tone. Which is about 20 Hz. and piezo speaker, show the audio beep. beep, followed by a tone frequency of the ringing. The called signal from the telephone lines is entered through C1, R1 Come to the bridge diode circuit D1-D4, D5 is the positive voltage at 20V supply to pin 1 of IC1 that KA2411 or CS8205 as the Telephone Bell Replacement IC. When IC1 is given the supply volt as I said, it will generator a ringing signals through the R5, to drive the Piezoelectric transducer BZ1 be a bell tone out to hear. We hear the sound of the Oscillator 2 series, which differ by the output frequency chops to be a frequency generator circuits. Which consists with R3, C3 is low.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Crystal-timebase
    avr What is the point of Buffers like this in Programmers
    AC Ohmmeter ESR Meter Circuit
    Programmable Stiffness Joint
    temp control fan hardware
    pwm using 555 timer ic
    Racal RA17C18
    Multi-Purpose VFO
    ECM Mic Preamp Project
    2001 cavalier: doesnt work daytime lights flash service light is on
    Henry Radio 5K Classic Blower Modifications
    Signal Generator circuit
    Speed differential negative feedback circuit
    A sound and light control switch circuit
    INA321 322 a low-cost medium accuracy ECG machine ECG amplifier



    Top