• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos | Circuits for Beginners | Basic Circuits | Hobby Projects | Transistor Circuits | LED Drivers 

You are here: Home / Security and Alarm / 2 Tone Ringtone Generator Circuit

2 Tone Ringtone Generator Circuit

Last Updated on September 1, 2021 by Swagatam 4 Comments

caution electricity can be dangerous

The IC LS1240A from SGS Thompson is specifically designed for generating a 2 tone ringtone generator circuit. Thus the IC specifically becomes suitable for landline telephones for producing the ringtones when a call is received.

However with little modifications the IC can be easily utilized for normal applications, in circuits where a double tone alarm may be required.

Technical Specifications

Basically the IC is a 8-pin DIL chip resembling the IC 555 and has the following specs:

  • Very low current consumption yet good audible response at the output.
  • Internal built-in rectifier stage for rectifying an AC input supply, a filter capacitor is also a built-in feature of the IC.
  • Hardly any external components required for setting up the circuit.
  • The tone of the output musical audio can be adjusted externally through a resistor.
  • If the IC os used inside a landline telephone then the supply to the IC is derived from the line voltage via a 1uF capacitor.
  • The IC is able to drive a piezo electric transducer directly without the need of inductors or amplifiers.
  • The IC is also capable of driving a small loudspeaker directly for generating the musical output.
  • However the speaker must be rated at minimum of 50 Ohms.
  • The following 2 tone ringtone generator circuit shows how to configure the IC LS1240 as a two tone musical signal generator circuit.

Pinout Details of the IC LS1240 dual tone generator IC

Circuit Diagram of two tone music generator using IC LS1240

Two Tone Generator using piezo element

Courtesy:

You'll also like:

  • 1.  How to Make a GHz Microwave Radar Security Alarm Circuit
  • 2.  Mains High Low Voltage Protection Circuit with Delay Monitor
  • 3.  SMS Based Laser Security Circuit
  • 4.  Office Call Bell Network Circuit with LED Monitor
  • 5.  Touch Operated Code Lock Switch Circuit
  • 6.  Anti Spy RF Detector Circuit – Wireless Bug Detector

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

Subscribe
Notify of
4 Comments
Newest
Oldest
Inline Feedbacks
View all comments

Primary Sidebar

Calculators

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (114)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (100)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (116)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (102)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (65)
  • Mini Projects (148)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (77)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (61)
  • Sensors and Detectors (120)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (60)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations

wpDiscuz