发明名称 |
Telephone set ringing current injection device |
摘要 |
A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transistor. The cathode of one diode is connected to the collector of the transistor on the side of one of the feed wires, the anode of the other diode and the emitter of the other transistor are connected to the other wire.
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申请公布号 |
US4306118(A) |
申请公布日期 |
1981.12.15 |
申请号 |
US19790075721 |
申请日期 |
1979.09.14 |
申请人 |
LE MATERIEL TELEPHONIQUE THOMSON-CSF |
发明人 |
CIBOULET, MICHEL;BELLY, JEAN L.;MALO-HUERTO, ANTOINE |
分类号 |
H04M19/02;(IPC1-7):H04M3/02 |
主分类号 |
H04M19/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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