Transformerless trunk circuit

Details Transformerless trunk circuit Transformerless trunk circuit

H - Electricity

04

M

379/66

H04M 7/00 (2006.01)

Patent

CA 1142281

TRANSFORMERLESS TRUNK CIRCUIT Abstract Of The Disclosure A two-way trunk circuit particularly useful for interconnecting a balanced lead pair and an unbalanced lead pair, with complete control over sidetone and signal level. The balanced lead pair is terminated with a first matching A.C. impedance and a second D.C. resistance. A first transform- erless circuit applies an incoming signal from the unbal- anced lead pair to the balanced lead pair, and a second circuit means applies an incoming signal from the balanced lead pair to the unbalanced lead pair. A third transformerless circuit cancels signals from said first circuit applied to the balanced lead pair to prevent them from being reapplied to the unbalanced lead pair, and a fourth transformerless circuit cancels signals from said second circuit applied to the unbalanced lead pair to prevent them from being reapplied to the balanced lead pair.

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