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1.CarbonMicrophoneoneofthefirstdevicesusedtoamplifysignalswasthecarbonmicrophone(effe...
1.Carbon Microphone
one of the first devices used to amplify signals was the carbon microphone (effectively a sound- controllde variable resistor).by channeling a large electric current through the compressed carbon granules in the microphone, a small sound signal could produce a much larger electric signal.The carbon microphone was extremely impotant in eraly telcommunications;analong telephones in fact work without the use of any other amplifiers.Before the invention of electronic amplifiers,mechanically coupled carbon microphones were also used as amplifiers in telephone repeaters for long distance service
2.Magnetic amplifier
A magnetic amplifier is a transformer-like device that makes use of the saturation of magnetic materials to produce amplification. It is a non-electronic electrical amplifier with no moving parts. The bandwidth of magnetic amplifiers extends to the hundreds of kilohertz.
Potating electrical machinery amplifier
3.Rotating electrical machinery amplifier
A Ward Leonard control is a rotating machine like an electrical generator that provides amplification of electrical signals by the conversion of mechanical energy to electrical energy. Changes in generator field current result in larger changes in the output current of the generator, providing gain. This classof device was used for smooth control of large motors, primarily for elevators and naval guns.
Field modulation of a very high speed AC generator was also used for some early AM radio transmissions. 展开
one of the first devices used to amplify signals was the carbon microphone (effectively a sound- controllde variable resistor).by channeling a large electric current through the compressed carbon granules in the microphone, a small sound signal could produce a much larger electric signal.The carbon microphone was extremely impotant in eraly telcommunications;analong telephones in fact work without the use of any other amplifiers.Before the invention of electronic amplifiers,mechanically coupled carbon microphones were also used as amplifiers in telephone repeaters for long distance service
2.Magnetic amplifier
A magnetic amplifier is a transformer-like device that makes use of the saturation of magnetic materials to produce amplification. It is a non-electronic electrical amplifier with no moving parts. The bandwidth of magnetic amplifiers extends to the hundreds of kilohertz.
Potating electrical machinery amplifier
3.Rotating electrical machinery amplifier
A Ward Leonard control is a rotating machine like an electrical generator that provides amplification of electrical signals by the conversion of mechanical energy to electrical energy. Changes in generator field current result in larger changes in the output current of the generator, providing gain. This classof device was used for smooth control of large motors, primarily for elevators and naval guns.
Field modulation of a very high speed AC generator was also used for some early AM radio transmissions. 展开
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碳麦克风用于放大信号的第一次设备之一是窜大电流通过麦克风在压缩的碳颗粒的碳麦克风 (有效地声音主宰可变电阻器).by,小声音信号能产生多大的电力信号。碳麦克风都极度只是它们依旧在天赐 telcommunications ; analong 电话其实工作无需使用任何其他放大器。在发明之前,电子放大器,机械耦合的碳麦克风也被用作放大器在电话中继器的长途服务2.磁放大器磁放大器是饱和度的变压器之类的设备,使使用的磁性材料产生放大。它是一个非电子电气放大器没有移动部件。磁放大器的带宽扩展了上百个千赫兹。Potating 电动机械放大器3.旋转电机放大器伦纳德 · 沃德控件是机械能的提供电子信号放大了转换为电能的发电机像旋转机械。发电机,提供增益较大的更改,在输出电流发生器字段当前结果的变化。此类设备用于大型电动机,主要是为电梯和海军炮的平稳控制。一些早期的 AM 无线电传输还用字段调制的很高的速度交流发电机。
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1。碳麦克风
第一个设备用来放大信号是碳麦克风(一个有效的声音——controllde可变电阻)。通过将一个大电流通过压缩碳颗粒在麦克风前,一个细微的声音信号可能会产生一个更大的电信号。非常重要的碳麦克风在早期telcommunications;analong电话事实上工作而不使用任何的其他放大器。电子扩音器发明之前,机械耦合碳麦克风还被用做放大器在电话中继器长途服务
2。磁放大器
一个磁放大器是一种transformer-like装置,利用饱和磁性材料生产放大。这是一个非电子电气放大器没有移动部分。磁放大器的带宽延伸到几百赫兹。
Potating电机放大器
3。旋转电机放大器
一个病房伦纳德控制是一个旋转机器像一台发电机提供放大的电子信号转换为机械能的电能。更改当前结果发电机领域在发生较大的变化输出电流的发电机,提供获得。这classof设备用于平滑控制的大型汽车,主要是针对电梯和舰炮。
字段的一个非常高的速度调制交流发电机也用在一些早期的广播传输。
第一个设备用来放大信号是碳麦克风(一个有效的声音——controllde可变电阻)。通过将一个大电流通过压缩碳颗粒在麦克风前,一个细微的声音信号可能会产生一个更大的电信号。非常重要的碳麦克风在早期telcommunications;analong电话事实上工作而不使用任何的其他放大器。电子扩音器发明之前,机械耦合碳麦克风还被用做放大器在电话中继器长途服务
2。磁放大器
一个磁放大器是一种transformer-like装置,利用饱和磁性材料生产放大。这是一个非电子电气放大器没有移动部分。磁放大器的带宽延伸到几百赫兹。
Potating电机放大器
3。旋转电机放大器
一个病房伦纳德控制是一个旋转机器像一台发电机提供放大的电子信号转换为机械能的电能。更改当前结果发电机领域在发生较大的变化输出电流的发电机,提供获得。这classof设备用于平滑控制的大型汽车,主要是针对电梯和舰炮。
字段的一个非常高的速度调制交流发电机也用在一些早期的广播传输。
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