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Cement Resistor - Series

 Cement Resistor Series  水泥電阻

Hone CM Cement Resistor - Series 

FEATURE

  • Exceptionally small and sturdy, mechanically safe, Excellent electrical characteristic
  • The materials used and the construction techniques ensure excellent flame resistance, arc resistance and moisture resistance as well as self-extinguishing capabilities, They will withstand the most rigorous loading test.
  • As resistors in radio and television receiver, The hazardous conditions of smoking and reheat can be completely prevented by the proper choice of power resistors.
  • Tolerance of ±5% and ±10% are standard.
  • Non-inductive type are available on request.
  • Heat and flame resistance
  • For high resistance value, The winding core will be replaced by metal oxide film core (RS Type)
  • Applicable specifications: EIA RS-344 and EIA RC-649
  • Power Rated: 3W ~ 1KW

Cement Resistor SQH Type Cement Resistor SQH Type Cement Resistor SQH Type Cement Resistor SQH Type Cement Resistor SQH Type Cement Resistor SQM Type

Cement Resistor SQP Type Cement Resistor SQT Type Cement Resistor SQZ Type  Cement Resistor SQH Type Cement Resistor SQM Type Cement Resistor SQP Type 

Cement Resistor SQT Type Cement Resistor SQV Type Cement Resistor SQZ-YA Type Cement Resistor SQZ-YB Type Cement Resistor SQZ-YC Type Cement Resistor SQZ-YD Type 

Cement Resistor SQZ-YD-I Type Cement Resistor SQZ-YE Type Cement Wire Wound  AH Type Cement MQ-MPR 大功率電力型繞線電阻 大功率電力型繞線電阻 

 大功率電力型繞線電阻 大功率電力型繞線電阻 

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Newsflash

以半導體構成的恆流源推動LED

LED驅動芯片 以半導體構成的恆流源推動

 

以半導體構成的恆流源推動LED

半導體可以構成相當穩定的恆流源,較以電阻控制電流穩定得多。一枚或多枚晶體管也可以構成簡單的恆流源,晶體管構成的恆流源簡單、成本低,使用運算放大器可以有更精確的電流控制,但線路較複雜,而且需要另加一個參考電壓源,成本大很多。這些線路的電流控制已相當精確,特別是使用運算放大器的線路,但功耗大、效率低的問題仍然是無法解決,對於大功率LED並不合適。最主要的原因是由於以線性方式控制電流,功耗消耗在電流控制元件內。

有些集成電路專為推動LED而設計,其檢測點做成的電壓降可以低至~0.2V的級數,這些集成電路多數都以開關式電源轉換]以控制LED電流恆定,開關式轉換配合mV級的檢測點電壓降使整體功耗十分低,但也有集成電路採線性電路控制LED的電流,例如用於單一枚鋰離子電池下推動白色光LED,由於採用線性電路,因功耗問題,輸出電流不能太大。