| No | Part number | Description ( Function ) | Manufacturers | |
| 1 | U4074B | Tone Ringer Interface U4074B Tone Ringer Interface Description The U4074B is a monolithic integrated circuit that contains all integral components of a ringing circuit for telephone sets used in conjunction with a microcomputer. The combination of a microcomputer and the U4074B permits flexible programming of the ringing sequence ( melody), tone and volume control. Ringing frequency detection takes |
 TEMIC Semiconductors |
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List of most widely used semiconductors
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 Vishay |
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