Member Blog Posts: telephone
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AVR Telephony Platform with Phone Recorder
Posted Feb 09, 2012 By Circuit ProjectsThe implementation of a phone line audio is described in this project along with the event recorder originally devised for technical…
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Telephone Answering Machine Known as TAM-TAM
Posted Feb 08, 2012 By Circuit ProjectsAn LPC2138 ARM7 RISC microcontroller is used to build The Active Mansion Telephone Answering Machine (TAM-TAM) which can support multiuser…
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Telephone Line Engaged Indication
Posted Jan 31, 2012 By Circuit ProjectsThe circuit was designed to indicate that the telephone line is being used in an environment where parallel telephones are installed in a…
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Monitoring Circuit for Telephone Line Usage
Posted Jan 27, 2012 By Circuit ProjectsThe circuit was designed to provide a monitoring scheme for a telephone line where several phones are installed, to indicate when one is…
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Telephone Record Control by 2N4360 FET, 2N2222 and 2N2102
Posted Jan 27, 2012 By Circuit ProjectsYou can connect your phone to any recorder device which has a mic and remote control input. This circuit automates the recording process…
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Ring Indicator of Telephone Line Circuit by LM555
Posted Jan 25, 2012 By Circuit ProjectsThe circuit has been designed for telephone apparatus to indicate an incoming call as it rings using an LED for visual indication.
- BC550…
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Simple Telephone Security Device
Posted Jan 25, 2012 By Circuit ProjectsIn the market, there are several types of telephone security devices which are generally simple but not cheap. On the other hand most of…
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2-Way Telephone Exchange System
Posted Jan 25, 2012 By Circuit ProjectsThe project attaches two ordinary telephones to produce a fully bi-directional facility with an intercom system.
On it normal operation,…
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Intercom System with Telephone-Based Door Entry
Posted Jan 25, 2012 By Circuit ProjectsThe circuit provides a simple illustration of a door phone intercom system having a two-way communication using the features of LM386…
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Telephone Spy Conversation Recording Circuit
Posted Jan 21, 2012 By Circuit ProjectsThe circuit aims to create a recording scheme not only for spying but for business purposes where conversations are noted for future…
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Off-Hook Telephone Line Indicator
Posted Jan 14, 2012 By Circuit ProjectsThe circuit is designed to connect in parallel with the telephone line, to monitor and detect if any telephone in the same line is busy,…
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