Telephone Ringer Circuits

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High isolation telephone ringer

The diode rectifies the ringing signal to supply the operating power to the audio relaxation oscillator made up of LI, L2, Rl, R2, and C. Moreover, L2 together with Ql acts as an opto-isolator, totally isolating the telephone line from the rest of the....
Tone ringer

The MC34012 tone-ringer chip derives its power by rectifying the ac ringing signal. That signal is normally at 20 Hz and measures between 70 and 130 volts rms. It uses that power for the tone generator and to drive the piezoelectric transducer. The sound....
Remote ring extender switch

The circuit can operate lamps and buzzers from the 120 V, 60 Hz power line while maintaining positive isolation betweenthe telephone line and the power line..
Telephone ringer piezoelectric

The electronic bell needs no power supply. Most of the resistors are not critical, although C2, R2, and R3 work best at the values given. Leaving out Rl will make the unit ring louder. The piezo buzzer may vary from store to store. If it has two leads,....
Electronic phone bell

The speaker emits a distinctive warble tone when ring pulses are applied to the phone line. Use this circuit as a remote bell or disconnect the phone"s ringer for direct use. Rl adjusts the duration of the output; R2 and R3 control the tone"s duty cycle and....
Telephone-controlled-night-light

When the telephone rings. or when the handset is lifted, ~the night light is turned on and remains on while the conversation takes place. When the handset is replaced in the cradle, the light remains on for about 11 s. During standby conditions, the -28 V....
Ringer-relay

When the phone rings, the ring signal from the telephone company lights a neon lamp within a CLM3120 optocoupler. That causes a drop in the resistance of the CdS cell output of the device, turning on transistor Ql. ..
Remote-telephone-ringer

The two neon bulbs will light when more than 100 V is across the ringing circuit. The bulbs provide line isolation between the unit and the telephone line. Finally, they act as a voltage divider for the bridge rectifier made up of D 1 through D4. That....
Ring-detector

This circuit detects the 20 Hz, "" 86-V rms ring signal on telephone lines and initiates action in an electrically isolated circuit. Typical applications would include automatic answering equipment, and interconnect/ interface and key systems. The circuits....
Extension Phone Ringer

The ac ringing voltage (typically 40 to 90 V at 26 Hz) is rectified by U1, the tone-ringer IC, and is used to drive ..
Telephone Visual Ring Indicator

In this circuit, the ringing voltage on a telephone line causes NE-1 to break over, triggering SCR1, which ..
Simple Ring Detector

This circuit detects the 20-Hz approximately 86-Vrms ring signal on telephone lines and initiates action in an electri..
Telephone Ring Converter Circuit

The circuit is based on the TCM1506 ring detector/driver integrated circuit. It is a monolithic IC specifically designed to replace-the telephone`s mechanical bell. The chip is powered and activated by the telephone-line ring, which can vary from 40 to 150....
Telephone Bell Simulator Circuit

This circuit is intended for use in a small private telephone installation. The ringing tone sequence is 400 ms on, 200 ms off, 400 ms on, 2 ms off. In the accompanying diagram, N1 and N2 form an oscillator that operates at a frequency of 5 Hz, which gives....
Musical telephone ringer

The heart of the circuit is IC1, General Instrument's AY-3-1350 melody-synthesizer IC. IC2 is a TCM1512 telephone ring detector IC that is powered by the telephone line. The circuit's operation begins when IC2 senses a ring pulse on the telephone line. The....
Circuit monitors blinking phone lights

A 2N5777 photo-Darlington cell picks up blinking light from the transparent plastic buttons. The power is switched ON and OFF by a hi-beta 2N3904 transistor. The circuit's 9 V battery can be left continuously connected. Less than a micro-ampere is drawn-even....
Telephone in-use indicator

This circuit functions as a line-current sensor and can be connected in series with either of the phone lines. For the circuit to indicate an "in use" status for all phones on a single line, it must be connected in series with the phone line before, or ahead....
Plug-in remote telephone ringer

This device consists of a ring detector connected to the telephone line. When the telephone rings, the ring detector impresses high-frequency pulses on the ac power line...
Tone ringer II

The XR-T8205 Tone Ringer is primarily intended as a replacement for the mechanical telephone bell. The device can be.powered directly from telephone ac ringing voltage or from a separate dc supply. An adjustable trigger level is provided with an external....
20Hz signal generator (phone-ringing) circuit diagram

As shown for the 20Hz signal generator, may be applied to the telephone ringing system, the signal source can also be used for alarm systems and other electronic Used. The circuit is actually a transformer T and a transistor VTl, VT2 composition..
Using voice instead of phone ringing message controller circuit

The call is made using language chip ISD1016 voice instead of using the phone ringing message controller schematic circuit. The controller can store messages, music, song, or other sounds, as an alternative to monotonous ringing...
Isolated send receive ring circuit diagram XTR105 RCV420

As shown in FIG later, RTD temperature collected in the field, which was converted into a voltage by the XTR105 voltage is converted into 4 ~ 20mA current output, and then the ..
XTR105 RCV420 composed of 12V power transmission reception circuit diagram of the ring

As shown in FIG, RTD using Pt100 type thermocouple. When the temperature is 100 ~ 600oC when, XTR105 output current 4 ~ 20mA, RCV420 output voltage of 0 ~ 5V. The figure for th..
XTR112 114 isolated transmit receive circuit diagram of the ring

As shown, collected at the scene RTD temperature, it is converted into a voltage by the XTR112/114 voltage is converted into 4 ~ 20mA current output, and then the twisted pair ..
Automatic telephone answering and ringtones indicator circuit diagrams

Check loop circuit for automatic telephone answering or tone generator for use reverse automatic repair. ..
Telephone Ring-Tone Generation

Here is a design that you can own, tailor to your specific needs, layout on your circuit board and put on your bill of materials. Finally, you will be in control of the black magic (and high voltages) of ring-tone generation...
TELEPHONE RING SIMULATOR CIRCUIT

This project has been specially designed to introduce you to SMD (Surface Mount Devices). Surface Mount is really not new. It started as far back as 1940 with a hybrid circuit in a digital watch. A chip was cemented onto a slab of ceramic material having....
Chip recorder customizes phone ringer

Companies usually purchase one type of telephone for all employees, which is understandable, especially if they obtain a discount for buying in quantity. One ringer sound for everyone can pose a problem, though, if the sound of a ringing phone makes a dozen....
Ringing Phone Light Flasher

I have received several emails asking how to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device...
Telephone Line optical and sound Ring

It is a relatively simple circuit, with which we can have optical and sound clue, when we have telephone ring in the line of telephone. The calls in the line, are changed in pulses of frequency 400 HZ from the IC2, in exit 3. Then via the IC4, after they are....
Phone ringer Schematic

The circuit consists of 6 building blocks and the first is the inverter between pins 1 and 2. This forms a low frequency oscillator with a 1u and 1M + 2M2 resistor. It governs the overall timing of the ring by creating an ON and OFF time. When the output is....
Audio and Visual Telephone ringer

Many a times one needs an extra telephone ringer in an ad joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to connect....

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