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Page Title: Sound-Powered Telephone Circuits
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Figure 3-5.-The selector switch. SOUND-POWERED TELEPHONE CIRCUITS The sound-powered telephone system consists of individual sound-powered  telephone  circuits.  As  stated  earlier  in  chapter  1, each circuit operates without any external source of electrical power.  The  number  and  various  types  of  circuits  installed depends  on  the  operational  requirements  of  the  ship. TYPES OF CIRCUITS There are three types of sound-powered telephone circuits: (1) switchboard, (2) switch box, and (3) string. A switchboard circuit  originates  from  a  sound-powered  telephone  switchboard. A  switch  box  circuit  originates  from  a  sound-powered  switch box.  A  string  circuit  consists  of  a  series  of  telephone  station jackboxes connected to a common line. Q8. From  what  component originate? Q9. What components are in does  the  switchboard  circuit a string circuit? 3-8

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