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build own pabx – Circuit Schematic
build own pabx
The main power source is 220V AC, which is step-down into 24V and 72V. The18V DC is used for telephone system and 72V AC supply is used for ringing telephone be...
DTMF – Circuit Schematic
DTMF
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fm telephone line bug transmitter – Circuit Schematic
fm telephone line bug transmitter
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300 baud modem circuit schematic – Circuit Schematic
300 baud modem circuit schematic
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how to build gsm based cell phone – Circuit Schematic
how to build gsm based cell phone
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dtmf decoder – Circuit Schematic
dtmf decoder
The main system is the user interface and control system. The phone line was chosen as the method of interfacing because it has distinct advantages over other s...
PIC CW Temp Circuit – Circuit Schematic
PIC CW Temp Circuit
Remotly check the temperature of a few things, in my case the repeater site at GB3PY. A system which used a radio to receive requests for the currenttemperature...
KD2BD Pacsat Modem – Circuit Schematic
KD2BD Pacsat Modem
The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface between a packet radio terminal node controller (TNC) and an am...
DTMF Decoder Circuit For PC – Circuit Schematic
DTMF Decoder Circuit For PC
Our DTMF decoder can be powered from a 9V battery or from your parallel printer port. It can detect and display all 16 DTMF digits on your computer screen in re...
DRSI DPK-2 TNC – Circuit Schematic
DRSI DPK-2 TNC
I just got a from HRO since I went down there to pick up a G5RV, straight key, and coax, and I cant get it to work with puTTY or Hyper Terminal, I seriously don...
1 Circuit and Wiring Diagram * 2 Parallel Phone TapCircuit * 3 Mobile/Cell – Circuit Schematic
1 Circuit and Wiring Diagram * 2 Parallel Phone TapCircuit * 3 Mobile/Cell
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nokia 5130 keypad ic solution 1000% working – Circuit Schematic
nokia 5130 keypad ic solution 1000% working
nokia 5130 keypad jumper just follow the diagram.. tested just now.. after doing the jumper.. all keypads working well .....
IP phone to analog phone or modem audio interface circuit – Circuit Schematic
IP phone to analog phone or modem audio interface circuit
The transformer is a 600:600 ohms transformer (also named 1:1 ratio 600 ohm transformer) : more or less the same number of turns on both primary and secondary c...
Your vending machine can talk thanks to a 5 embedded modem – Circuit Schematic
Your vending machine can talk thanks to a 5 embedded modem
Despite the astonishing proliferation of wireless connections, analog POTS or "plain old telephone service" still delivers on price and availability. Credit car...
Telephone Line Indicator Circuit – Circuit Schematic
Telephone Line Indicator Circuit
With the aid of an (old) moving coil instrument it is very little effort to make a simple voltmeter that, at a glance, indicates the status of a telephone line....
Working Principle Television (TV) – Circuit Schematic
Working Principle Television (TV)
Before we study the working principles of a TV receiver, it is worth knowing a little about the journey of the object image that we usually see on TV. Images th...
CCE HPS-2185FSE CRT TELEVISION SCHEMATIC DIAGRAM – Circuit Schematic
CCE HPS-2185FSE CRT TELEVISION SCHEMATIC DIAGRAM
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voltage What kind of Mic do I need to connect to a pots telephone line to speak – Circuit Schematic
voltage What kind of Mic do I need to connect to a pots telephone line to speak
What kind of microphone or mouthpiece I can use to connect across a pots telephone line in order to send dtmf tones ( no voice ) dtmf only. Can I use a regular ...
audio How to create a multi-extension intercom system using wired phones – Circuit Schematic
audio How to create a multi-extension intercom system using wired phones
Create a simple (telephone based) intercom system in our new house. Shouting between rooms is not so good, and trying to use an IM client or Facetime doesn`t ha...
opto isolator Ring detector circuit transistors not fully activating – Circuit Schematic
opto isolator Ring detector circuit transistors not fully activating
A ringer interface circuit, and I`m running into problems that are over my head. The purpose of the circuit is to buffer the output of a central telephone syste...