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Ringer circuit diagram

 

     
     
     
     

 

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TELEPHONE TONE RINGER circuit diagram  UTC 31002A is a bipolar integrated circuit designed for telephone bell replacement. It can also be used as alarms or other alerting devices. Designed for telephone bell replacement.

The application circuit illustrates the use of the UTC 31002A device in typical telephone tone ringer application. The AC ringer signal voltage appears across the TIP and RING inputs of the circuit and is attenua-ted by capacitor C1 and resistor R1. C1 also provides isolation from DC voltage (48V) on the exchanged line. After full wave rectification by the bridge diode, the wave form is filtered by capacitor C4 to provide a DC supply for the tone ringer chip. As this voltage exceeds the initiation voltage (Vsi), oscillation starts. With the components shown, the output frequency chops between 512Hz (FH1) and 640 Hz (FH2) at a 10 Hz (FL) rate. The loudspeaker load is coupled through a 1300Ω to 8Ω transformer. The output coupling capacitor C5 is required with transformer coupled loads. When driving a pizeo-ceramic transducer type load, the coupling C5 and transformer (1300Ω:8Ω) are not required. However, a current limiting resistor is required.

Ringer circuit diagram

 

TONE RINGER circuit diagram WITH BRIDGE DIODE

APPLICATIONS Electronic telephone ringers Extension ringers. The KA2418B/28 is a monolithic integrated circuit telephone tone ringer with bridge diode, when coupled with an appropriate transducer, it replaces the electromechanical bell. This device is designed for use with either a piezo transducer or an inexpensive transformer coupled speaker to produce a pleasing tone composed of a high frequencys (fH1, fH2) alternating with a low frequency (fS) resulting in a warble frequency. The supply voltage is obtained from the AC ring signal and the circuit is designed so that noise on the line or variation of the ringing signal can not affect correct operation of the device.

 

TONE RINGER circuit diagram

 

Telephone Tone Ringer

Complete Telephone Bell Replacement Circuit diagram with Minimum External Components  On-Chip Diode Bridge and Transient Protection  Direct Drive for Piezoelectric Transducers  Push Pull Output Stage for Greater Output Power Capability  Base Frequency Options  34017A-1: 1.0 kHz  34017A-2: 2.0 kHz  34017A-3: 500 Hz Input Impedance Signature Meets Bell and EIA Standards  Rejects Rotary Dial Transient

Telephone Tone Ringer

 

 
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