klangfilm 發表於 2006-10-10 20:30:46

新豬肉, 請教問題 !

有沒有高手試過用幾十枝細火電阻, 換一枝大火的陰極電阻 ?

效果好嗎 ?

modi 發表於 2006-10-13 22:07:22

用很多電阻並聯就未試過,但圖中是用了兩個2K電阻並聯,每個電阻都有20W,其實用兩顆電阻的好處是將W數增大,另到熱系數更加穩定,當中比用一個電阻來得好。

ackcheng 發表於 2006-10-14 12:41:45

passlab is using this technique to improve accuracy

kk_ho 發表於 2006-10-16 18:01:30

More resistor

Advantages:
Power dissipation can spilit into many.
Lower noise from resistor noise voltage = SRT of 4KTBR

Disadvantges:
Higher cost
More space use
Same value/power rating of each resistor.

KK
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