7805這一顆穩壓IC是很多玩電子電路的人所常用的一顆IC,它的功能就是把輸入7~25 V的電壓,調整成5V輸出的電壓,穩壓效果很不錯的零件,只有3支腳,安裝使用方便,但常常需要加散熱片,因為輸出電流大一點時它會發熱,加散熱片才能防止它燒燬。
以下說明它的特點:
以下說明它的特點:
Pull-up Resistors / Pull-down Resistors / Damping Resistors |
Digital circuits ordinary have bus line configuration on printed circuit boards. Bus lines might be better stabilized by pulling up to Vcc using resistors around 1k-100 k, or by using termination resistors matched to signal line impedance. Or, sometimes, damping resistors of around 10-30 are added in series to signal lines to eliminate reflected waveforms. |