Labels:text | font | black and white | screenshot | document | newspaper | printing | white | number OCR: FORTRESS FUN-DING TAP INTRODUCTION CIRCUIT DESCRIPTION A modern Coin Telephone set must provide new When the telephone handset is lifted, s line features that will become telephone industry standards switch contact applies central office battery to the as coin telephone services are upgraded by Operating circuit via the Ring and Tip leads (Fig. 1). A power Companies': Among these are a high quality, reliable, supply and protection circuit increases the available electronic coin value signalling system and a variable supply voltage by approximately 1.8V dc to maintain initial rate coin totalizing circuit. A new elect- the minimum 3V dc requirement of the circuit, corrects ronic tone generating circuit has replaced the mechan- line voltage polarity, and protects the circuit against ical gong ...
