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File information:
File name:Telephone privacy circuit.pdf
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Size:190 kB
MD5 Checksum:b6a86e0f5506fa93fefba4f0765766d2


Original Chassis:
Descr:this small circuit is a radio broadcast fm telephone line operated however i havent design it i just downloaded years ago
Group:Electronics > Radio stations > HAM radio-stations >
Uploaded:2005-08-08 14:47:29
Multipart:No multipart

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File nameText
Telephone privacy circuit.pdfTelephone privacy adapter Design and copyright by Tomi Engdahl 1996 Summary of circuit features q q q q q q q q q q q q q Brief description of operation: Prevents telephone call to be heard form other telehones in the same subscriber line Circuit protection: Works on both line polarities, no special overvoltage protection Circuit complexity: Very simple and easy to build, no need for circuit board Circuit performance: Briefly tested with one telephone and telephone exchange Operation principle: When one telephone is picked up the circuits prevent other telephones to be picked up (thy do not get any line current). Circuit use: Installed between telephone line an telephone. You need one circuit per every telephone. Availability of components: Q1 (BR103) is widely available, Q2 might be hard to get Design testing: Built quickly from the parts found on my home lab, seemed to work on short test with telephone line simulator and line connected to PBX, I have received a report that this

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