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Application filed by Boris M LazarovfiledCriticalBoris M Lazarov
Priority to BG9482991ApriorityCriticalpatent/BG51569A1/en
Publication of BG51569A1publicationCriticalpatent/BG51569A1/en
The device is used in electronic telephone exchanges and in concentrators. It is simplified and upon lifting the telephone set up during passing the call voltage, it delivers a signal, which is received directly by the exchange control bloc. The device is connected to the call voltage generator (2) in the exchange and a linear transformer (9) and contains a call voltage switch bloc (3), a diode (4), a subscriber stub status recognition bloc (6), a resistor (8), a choke (8) and a capacitor (10).<IMAGE>
BG9482991A1991-07-171991-07-17Device for supplying calling voltage to a telephone set
BG51569A1
(en)