Electronic telephone circuit

Details Electronic telephone circuit Electronic telephone circuit

H - Electricity

04

M

379/82

H04M 1/60 (2006.01)

Patent

CA 1150868

P.F. Blomley - 3 (Rev.) ELECTRONIC TELEPHONE CIRCUIT Abstract of the Disclosure A telephone instrument circuit including electronic components for functions such as amplifying incoming and outgoing speech signals. When the electronic transducers of such elec- tronic instruments have to operate in parallel with a carbon microphone in another instrument, problems are likely to arise. To deal with the problem, a voltage regulator is used which includes two essentially series coupled com- parator-amplifiers, the first of which is driven by the circuit's supply voltage. The second amplifier has its own reference voltage and its output varies the reference voltage VR for the first amplifier, whose output is connected to the line whose voltage is being regulated. Above a preset line current, the I-V characteristic of the circuit is almost flat while below the preset threshold it is fairly steep to enable satisfactory parallel operation.

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