Results tagged #Phone Line in Circuits
Phone line-powered flashlight
This works in a way that the phone line won`t stay busy while the LEDs are connected and when you pick up the phone, the light goes off and ...
Cut Phone Line Detector
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Telephone line monitors
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`...
Phone Busy Indicators
It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED is lit. It needs no external power and ...
Cut Phone Line Detectors
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phone record circuit
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`...
phone cut circuit
A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in E...
phone busy circuit
Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection Well, this simple circuit should put ...
Circuit Detects Phone-Line Breaks
Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary...
Phone Line Polarity Checker
Do you suspect your broadband speed (DSL) is slower than it should be It could be as simple as incorrect polarity in your phone wall socket....
Phone Line Interface Circuit
This circuit should be useful for interfacing phone projects to the telephone line. ...
Phone line busy indicator
This is the most simple phone busy indicator is possible with only three parts. Connect the circuit so that the green light illuminates when...
Phone line in use drives Relay
Circ?it to close a relay when any phone extension is off-hook. Uoltage at the gate of the MOSFET sho?ld be negative (1-3 volts) with respect...
Phone line audio muting circuit
Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important i...
Advanced Phone in use circuit
This project has two features. It will let you know when a single phone is using the line and also when two phones are on the line!
The gre...
Phone Line In use LED
If we have a lot of parallel telephones on a telephone line, we needed a unit that will have the possibility of showing if somebody of the t...
Phone Line In use LED with 2N2222
With this circuit mounted in or near every phone in the house, it will allow users to know if the phone is being used and not to pick up the...
Phone line indicator using BF256B
With this circuit can determine whether any of the phones of the same line is busy (it's up the handset), with the help of a LED.To circuit ...
Phone line indicator using BF256B
With this circuit can determine whether any of the phones of the same line is busy (it's up the handset), with the help of a LED.To circuit ...
Cut Phone Line Detector
A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in E...