ELECTRONIC DUAL-TONE RINGER

FEATURES * Low current consumptioin,in order to allow the parallel operation of 4 devices. * Integrated rectifier bridge with zener diodes to protect against overvoltage. * Little external circuitry. * Tone and switching frequencies adjustable by external components. * Intergrated voltage

电话机电路

UTC1240A是一单片集成电路，与电声换能器相连接后可替代电话机电路中机械振铃部分。这两个电路都能用来直接驱动压电陶瓷换能器(蜂鸣器)。\n★UTC1240A的输出端需要一个耦合电容。\n★UTC1240A的输出没有电流限制功能，所以建议使用50Ω以上的直流负载。\n★内部振荡器产生的两个音频频率由另外一个内部振荡器产生的低频频率交替切换，通过输出放大器驱动扬声器发出声音。两个音频 和交替频率都可由外部元件来调整。\n★电路的供电电源由交流铃流信号整流获得，电路经过特殊设计以使得电话线上的噪声或铃流信号的波动不影响电路的正常工作。\n★UTC1240A的封装形式均为8引线双列直插式和扁平贴片

PATENTED GOLD METALIZED SILICON GATE ENHANCEMENT MODE RF POWER VDMOS TRANSISTOR?

General Description Silicon VDMOS and LDMOS transistors designed specifically for broadband RF applications. Suitable for Military Radios, Cellular and Paging Amplifier Base Stations, Broadcast FM/AM, MRI, Laser Driver and others. Polyfet process features gold metal for greatly extended lifetime

Electronic two-tone ringer

Description LS1240 is a monolithic integrated circuit designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter. It can drive directly a piezoceramic converter (buzzer) or a dynamic loudspeaker. The output current capability of LS1240 is higher

Electronic two-tone ringer

Description LS1240 is a monolithic integrated circuit designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter. It can drive directly a piezoceramic converter (buzzer) or a dynamic loudspeaker. The output current capability of LS1240 is higher

ALTERNISTORS

DESCRIPTION The TODV 640 ---> 1240 use a high performance passivated glass alternistor technology. Featuring very high commutation levels and high surge current capability, this family is well adapted to power control on inductive load (motor, transformer ) FEATURES ■ HIGH COMMUTATION :

Photo Modules for PCM Remote Control Systems

Description The TSOP12 – series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. Features  Photo detector and preamplifier in one package  Internal filter for PCM freq