TTL_DTL_interface_to_telephone_equipment

Published:2009/7/24 11:46:00 Author:Jessie | From:SeekIC

This circuit provides interface of positive-logic circuits to negative-powered telephone equipment. In addition, the circuit provides for a change in voltage level (+5 and -50 V), as well as isolation, using an H11G optoisolator. Motorola Thyristor Device Data, 1989, p. 6-54.



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