Unisonic Technologies
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
Microchip Technology
Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
Unisonic Technologies
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
ELAN Microelectronics
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
ELAN Microelectronics
TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE
STMicroelectronics
Electronic two-tone ringer
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