Telephone Ringtone Generator Circuit

Posted on Feb 6, 2014

This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simulated telephone ringtone and requires only DC supply with 4. 5V DC to 12V DC voltage. One may possibly use this circuit in ordinary intercom or phone-type intercom. The sound is pretty loud when this c

Telephone Ringtone Generator Circuit
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ircuit is operated on +12V DC power supply. Even so, the volume of ring sound can be adjusted. CD4060B is chosen to produce three kinds of pulses. Preset VR1 is fine-tuned to get 0. 3125Hz pulses at pin 3 of IC1. At the same time, pulses obtainable from pin 1 will be of 1. 25 Hz and 20 Hz at pin 14. The three output pins of IC1 are connected to base terminals of transistors T1, T2, and T3 through resistors R1, R2, and R3, respectively. Working with a built-in oscillator-type piezobuzzer generates about 1kHz tone. In this particular circuit, the piezo-buzzer is turned on` and off` at 20 Hz for ring tone sound by transistor T3. 20Hz pulses are obtainable at the collector of transistor T3 for 0. 4-second duration. Just after a time interval of 0. 4 second, 20Hz pulses become again obtainable for another 0. 4-second duration. This is followed by two seconds of nosound interval. Thereafter the pulse pattern repeats by itself. Se trata de un sencillo generador de timbre de llamada para el telG©fono de casa que se construye con sG³lo unos pocos componentes electrG³nicos. Genera un tono de llamada telefG³nica simulada y sG³lo requiere de una alimentaciG³n de corriente continua de 4, 5 V a 12 V. Se puede hacer uso de este circuito en sistemas de intercomunicaciG³n ordinarios que empleen aparatos de tipo telefG³nico. El sonido es bastante fuerte cuando este circuito es alimentado con +12 V. AG n asG­, se puede ajustar el volumen del...

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