Telephone Line Simulator Schematic

Posted on Jun 5, 2012

The following text describes construction, testing and use of an electronic telephone line simulator of my own design. This self-build project can simulate a telephone call / connection between any two local telephone devices. This for a fraction of the outlay of some commercial units, many with cost-increasing features that usually are not required. LineSim makes all the following actions possible without occupying a telephone line or incurring any call charges. At some time, you must have wanted to do at least one of these things.

Telephone Line Simulator Schematic
Click here to download the full size of the above Circuit.

If your work requires you to demonstrate any form of telephony equipment, LineSim can make it a breeze. No need to have one or even two telephone lines available, just connect your equipment to LineSim and away you go! Fax Machine as Scanner and Printer. LineSim lets your fax machine function both as a monochrome full-page scanner and as a high-resolution printer. If a scanner is not available, LineSim can link your fax machine to your modem, allowing you to scan a paper document or image into your computer by sending it to the PC as a fax. If a good quality printer is not available, LineSim enables your modem to send a document to your own fax machine, resulting in a high-resolution printout. To initialise a connection, just set the fax or PC to dial any arbitrary number (or no number). You may have seen overpriced units advertised offering 'fax as scanner / printer' facilities, however these do not provide either dialling tones or a ringing signal. Consequently, you must set your modem for blind dialling and use your fax machine and modem in manual receive mode. (If this is all you require, click here.) Conversely, LineSim simulates a conventional telephone call, producing all the required tones and signals, thereby allowing normal dialling and automatic answering. If you need to program several numbers into a telephone and do not have its manual, it may take some trial and error to discover how to...

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