加 Fet 前一問

想問下如加左 Fet 後 如果PCB 瓜左, d Fet 仲用唔用得返?

想問下如加左 Fet 後 如果PCB 瓜左, d Fet 仲用唔用得返?
killermomo 發表於 2009-7-9 14:19

                               
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通常塊PCB瓜之前，都係啲Fet瓜先，啲Fet係有保護作用!

oh really..... 咁 jack 係加 左 fet , pcb 仲襟玩d......

oh really..... 咁 jack 係加 左 fet , pcb 仲襟玩d......
killermomo 發表於 2009-7-9 14:24

                               
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錯, 應該係相反.

情況等同越好跑o既跑鞋越快玩完, 比賽引擎一場就要換...

原裝FET 塊PCB一定最襟玩

oh really?! 因已用 speed v 麻打, 都覺唔夠快了, 開始想提升速度, 所以計劃先加 Fet 再改用手繞麼打..

錯, 應該係相反.

情況等同越好跑o既跑鞋越快玩完, 比賽引擎一場就要換...

原裝FET 一定最襟玩
800mah 發表於 2009-7-9 14:48

                               
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Original FETs (3010) are inferior to many others like the 4562 in terms of the max current that they allow and internal resistance. There shouldn't be any proof that 3010s are more durable.

But there is a high chance for the PCB to break down when someone replacing the FETs does not do their job quickly and thus it burns some of the ICs or even the Fets. You might have thus misblamed the new FETs. Instead, you should have blamed the person who changed the FETS for you.

Original FETs (3010) are inferior to many others like the 4562 in terms of the max current that they allow and internal resistance. There shouldn't be any proof that 3010s are more durable.

But ...
billy86che 發表於 2009-7-9 16:06

                               
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Exactly, as the person who helped me to add Fet, would test each level of the FET after soldering.....see they were working properly or not, make sure all each Fet was working to obtain the best performance!

So is there any suggestion that which shop adding Fet is better & reliable?

So is there any suggestion that which shop adding Fet is better & reliable?
killermomo 發表於 2009-7-9 16:29

                               
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Both CT and MMS are good for adding Fet!

Yeah!! Thank you ching.....is it really obviously improve after adding fet?

Yeah!! Thank you ching.....is it really obviously improve after adding fet?
killermomo 發表於 2009-7-9 16:48

                               
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If you just using X speed....you won't really feel big difference.....If you change to AD stock or even Chili.....you will feel the difference.....and you will feel that the respond of the motor will be faster, especially when you release the trigger, then compress the trigger again!

Original FETs (3010) are inferior to many others like the 4562 in terms of the max current that they allow and internal resistance. There shouldn't be any proof that 3010s are more durable.

But ...
billy86che 發表於 2009-7-9 16:06

                               
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what i was trying to explain to 樓主was to differentiate between PCB and the FETs, the 3004/3010 are of coz inferior to 4562 7389 etc. but that fact that they burn easier will protect other parts of the PCB from failing.

so if u want the PCB to be durable (not the fets), use FETs that allow lesser current.

that's what i think ~

Yeah!! Thank you ching.....is it really obviously improve after adding fet?
killermomo 發表於 2009-7-9 16:48

                               
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performance increased.
but the durability of the PCB will decrease.

afterall, who will use the PCB for ten years.

通常塊PCB瓜之前，都係啲Fet瓜先，啲Fet係有保護作用!
scalpel 發表於 2009-7-9 14:21

                               
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所以換左 4562, 7389 之類o既勁FET, 你所講o既保護作用就會冇左.

所以換左 4562, 7389 之類o既勁FET, 你所講o既保護作用就會冇左.
800mah 發表於 9-7-2009 05:27 PM

                               
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Does it mean that FET = fuse? Since FET has to handle  high current (like a gateway) so it will burnt first then no current pass the PCB circuit. There should be no guaranty that FET can protect the PCB.   Please correct me if I am wrong.

FET is not a fuse, but the FET u use should commensurate with what the rest of the PCB can handle.

originally, it's always the FET that burns first under high current, but if u change the FET to something else, well... something will be different of coz.

所以換左 4562, 7389 之類o既勁FET, 你所講o既保護作用就會冇左.
800mah 發表於 2009-7-9 17:27

                               
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Wrong concept. Fets are not devices to protect the pcb and having lower quality Fets does not mean better protection for your pcb. (d人以為換fet塊pcb會易死d,其實通常係因為手工唔好.)

Wrong concept. Fets are not devices to protect the pcb and having lower quality Fets does not mean better protection for your pcb.
billy86che 發表於 2009-7-9 23:41

                               
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that's why i say "你所講o既保護作用" , sth he thinks , not me

18# 800mah


But it seems that you support the idea of "original fets make the pcb more durable" in 4# when you said,

"錯, 應該係相反.
情況等同越好跑o既跑鞋越快玩完, 比賽引擎一場就要換
原裝FET 塊PCB一定最襟玩"

18# 800mah


But it seems that you support the idea of "original fets make the pcb more durable" in 4# when you said,

"錯, 應該係相反.
情況等同越好跑o既跑鞋越快玩完, 比賽引擎一場就要換
原 ...
billy86che 發表於 2009-7-10 17:37

                               
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forget about it, i don't think the person who asked this is reading anymore