This next diagram depicts active components, the difference between active and passive is that active components require a power source to work, whereas passive components do not. The top symbols represent vacuum tube or thermionic devices. Although at one time, these were being replaced by the smaller transistor and integrated circuits, they are finding their way back into electronics for use in professional audio equipment and some radio receivers. I would like to point out that the demise of thermionic devices was not due to poor performance, it was because of the physical size, weight and power consumption when compared to transistorized equipment. Also the US symbol set has a circle around most active components, whereas the european symbol set does not.
Rabu, 25 Agustus 2010
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COMPONENT SYMBOLS
COMPONENT SYMBOLS
This next diagram depicts active components, the difference between active and passive is that active components require a power source to work, whereas passive components do not. The top symbols represent vacuum tube or thermionic devices. Although at one time, these were being replaced by the smaller transistor and integrated circuits, they are finding their way back into electronics for use in professional audio equipment and some radio receivers. I would like to point out that the demise of thermionic devices was not due to poor performance, it was because of the physical size, weight and power consumption when compared to transistorized equipment. Also the US symbol set has a circle around most active components, whereas the european symbol set does not.
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