Results tagged #Telephone in Circuits
Telephone electronic lock circuit
Electronic lock using the telephone key (resistor connected plug) is inserted after the oscillator circuit start-up circuit, and the oscilla...
Automatic telephone call recording circuit
DC voltage present on the telephone line is usually about 45 to 50V, on-hook and off-hook to 6V. The step-down circuit relay is activated. R...
Automatic telephone call recording circuit
DC voltage present on the telephone line is usually about 45 to 50V, on-hook and off-hook to 6V. The step-down circuit relay is activated. R...
Stock dial telephone line power supply circuit diagram
Compilation dial phone numbers with 15 commonly used libraries (plus number dialed) are stored in a standard CMOS RAM, one button keypad ma...
Homemade small telephone PBX circuit diagram
Circuit principle outside into the phone when ringing pulses through C1, R1, D2 to C2 charging voltage in 6V, this voltage causes N1, N2 re...
Automatic telephone answering and ringtones indicator circuit diagrams
Check loop circuit for automatic telephone answering or tone generator for use reverse automatic repair. ...
Telephone relay circuit
By cross-connect telephone ringing circuit, when the phone rang, the circuit closes the relay. It uses the delay in contact, thus to drive ...
Automatic telephone answering circuit diagram
Automatic telephone responder circuit is shown in Fig. FIG IC2 10 seconds voice recording circuit SR9G10A, press the power switch S2, can b...
Automatic recording telephone interface circuit
Automatic recording telephone interface circuit as shown, the circuit has an automatic answering and recording function (need to reprovisio...
Telephone control automatic lamp circuit 1
Automatic light is introduced by the telephone block system, the phone rang that night and asked the owner to pick up the handset or pull L...
Telephone Data Interface circuit
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Telephone ringtone generator circuit
Join the forum discussion on this post This is a simple home telephone ringtone generator circuit which is built with applying only several ...
REMOTE TELEPHONE BELL RINGER
The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing tele...
PHONE RING REMOTE CONTROL
Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring...
Telephone Ringer
This circuit generates the sound of the electronic ringer found in modern telephones, supplanting the 2-bell electromechanical ringers used ...
Telephone Circuits
When a new computer modem enters the household, the demands on the home phone line skyrockets. The Internet surfer can use phone time on a p...
telephone ring generator circuit
This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating b...
ring generator circuit
Restore the older style of telephones which used a pair of gongs to annunciate an incoming call, AND long to hear the nostalgic peel of thos...
Telephone electronic ringer circuit
Telephone electronic ringer circuit is shown as above,Figure (a) is the electronic ring circuit with an NPN transistor V1 (choose 9014 or 3D...
Telephone electronic ringer circuit
Telephone electronic ringer circuit is shown as above,Figure (a) is the electronic ring circuit with an NPN transistor V1 (choose 9014 or 3D...
Telephone electronic coded lock circuit
Telephone electronic coded lock circuit is shown as above,the electronic coded lock is suitable for double audio circuits.After the phone ad...
Telephone electronic coded lock circuit
Telephone electronic coded lock circuit is shown as above,the electronic coded lock is suitable for double audio circuits.After the phone ad...
Internal telephone circuit
Internal telephone circuit is shown as below,improving slightly a toy telephone will become a variable practical internal telephone. This ph...
Internal telephone circuit
Internal telephone circuit is shown as below,improving slightly a toy telephone will become a variable practical internal telephone. This ph...
VERY SIMPLE TELEPHONE INTERCOM CIRCUIT
Tro telephones can be used as an intercom by using this circuit. Older style rotary phones that are nonelectronic might work best in this ap...
VERY SIMPLE TELEPHONE INTERCOM CIRCUIT
Tro telephones can be used as an intercom by using this circuit. Older style rotary phones that are nonelectronic might work best in this ap...
UM95088 TelephoneCircuit
UM95088 telephone circuit diagram is shown in the above picture. UM95088 is specialized integrated module of dual tone multiple frequency fo...
UM95088 TelephoneCircuit
UM95088 telephone circuit diagram is shown in the above picture. UM95088 is specialized integrated module of dual tone multiple frequency fo...
TELEPHONE RINGER
Using an AMI chip P/N S2561, this telephone ringer can be powered line. Audio output is about 50 mW when powered from a 10-V source.....
TELEPHONE RINGER
Using an AMI chip P/N S2561, this telephone ringer can be powered line. Audio output is about 50 mW when powered from a 10-V source.....
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 p...
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 p...
telephone ringtone generator
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Fitting Extension BT Sockets
Extending BT telephone sockets can result in hum appearing on the line or, if two telephone lines are taken through the same cable, cross ta...
Telephone Ringer
If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. It`s actually a telep...
Electronic Telephone Ringer
This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators conn...
Kodiak Military History Fire Control Telephones
The EE-91 is a wall mounted metal telephone box. It is a common battery phone which means transmitter current is obtained from the central o...
Telephone Technical References
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GPO one-piece telephone
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Spy Telephone circuit Schematic
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Telephone line monitor circuit
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`...
Telephone Ring Generator Using Small Power Transformer
The interval between rings can be lengthened or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring voltage is pro...
9-Line Telephone Sharer
This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, say, up...
Telephone recording
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Telephone ringing circuits
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Telephone interfacing circuits
A telephone uses an electric current to convey sound information from your home to that of a friend. When the two of you are talking on the ...
Telephone privacy circuit
Built quickly from the parts found on my home lab, seemed to work on short test with telephone line simulator and line connected to PBX, I h...
Electronics Telephone Talking Security and other sensors and detectors circuits
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Telephone line based audio muting and light on circuit
The circuit would automatically light a bulb on arrival of a telephone ring and simultaneously mute the music system/TV audio for the durati...
Remote control using telephone
A teleremote circuit which enables switching on` and off` of appliances through telephone lines. It can be used to switch appliances from an...