Line powered transformerless loudspeaking telephone

Details Line powered transformerless loudspeaking telephone Line powered transformerless loudspeaking telephone

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/10 (2006.01)

Patent

CA 1167988

- 14 - LINE POWERED TRANSFORMERLESS LOUDSPEAKIMG TELEPHONE Abstract of the Disclosure A line powered loudspeaking telephone is implemented entirely from electronic components, eliminating inductors and transformers. A three stage output amplifier is used with the loudspeaker impedance forming the output stage impedance. A feedback network is used between the amplifier input and output stages to provide the desired gain at audio frequencies while forcing the DC gain to unity. The circuit then functions to provide proper gain for audio frequency signals received from the communication line while reflecting onto the communication line the resistive component of the output stage impedance scaled by biasing circuit elements of the amplifier input stage, thereby maintaining the proper voltage-current characteristic of the communication line.

382019

Affiliated with

Also associated with

Rating

Line powered transformerless loudspeaking telephone does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Line powered transformerless loudspeaking telephone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line powered transformerless loudspeaking telephone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1183936