F1 questions

eyoung · 21st January 2010, 02:53 AM

AS I am lingering behind most of you, I am endevoring to build an F1. The questions are can I sub BC557 Or 2N5501 for ZTX550 and IRFP640 for non essential IRFP240????Or all of them for that matter Knowing that they do not dissapate heat as well as the IRFP240.

Thanks for your replies, Elwood

Gyuri · 26th January 2010, 06:27 PM

Dear my friend, I try to answer for you.
As if I would have read it many times, the ZTX550 not critic, its substitution is easy.
Nelson diverted a truckful of quantity presumably the ZTX, uses it because of that. A pleasant one is a transistor otherwise.
I can judge it, it irfp240 and it irfp640 only the package the difference. According to me if you do not exceed the 25 watt dissipation you may not have problem with it.

Gyuri

woody · 28th January 2010, 02:54 AM

Why do you want to use the irf640 instead of the irfp240. That larger package will
get rid of the heat so much better I don't think the savings in cost would be worth
going with the 640.

21st January 2010, 02:53 AM	#1
eyoung diyAudio Member Join Date: Aug 2007 Location: Sunny SC,USA 15 min south of Charlotte NC	F1 questions AS I am lingering behind most of you, I am endevoring to build an F1. The questions are can I sub BC557 Or 2N5501 for ZTX550 and IRFP640 for non essential IRFP240????Or all of them for that matter Knowing that they do not dissapate heat as well as the IRFP240. Thanks for your replies, Elwood __________________ "when you open your mind to the imposible, soon you will find the truth...."

26th January 2010, 06:27 PM	#2
Gyuri diyAudio Member Join Date: Nov 2003 Location: Budapest	Dear my friend, I try to answer for you. As if I would have read it many times, the ZTX550 not critic, its substitution is easy. Nelson diverted a truckful of quantity presumably the ZTX, uses it because of that. A pleasant one is a transistor otherwise. I can judge it, it irfp240 and it irfp640 only the package the difference. According to me if you do not exceed the 25 watt dissipation you may not have problem with it. Gyuri __________________ Those who would have deserved the life they are all dead already. "Oh, my dead dears!" - Captain Cat

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28th January 2010, 02:54 AM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Why do you want to use the irf640 instead of the irfp240. That larger package will get rid of the heat so much better I don't think the savings in cost would be worth going with the 640.

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