This 89C51 PABX project is basically an eight line intercom from which you can call one to eight numbers.
The 89C51 PABX system also supports dialling and receiving telephone calls.
Link includes full circuit schematic.
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This page contains a single entry from the blog posted on October 29, 2007 8:00 AM.
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Build your own 89C51 PABX
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