Question about proper orientation of Q5,Q6 F5 driver board

qboneus · 20th August 2009, 05:36 AM

cviller board rev 1.0, has markings blacked out.
contrary to board markings using my meter it would appear the proper orientation of a ZTX550/ZTX450 in Q5/Q6
http://www.diodes.com/datasheets/ZTX550.pdf
http://www.diodes.com/datasheets/ZTX450.pdf
would be like this??

but not sure...
can someone with experience advise me?
Don't want to solder till i'm 100%
thanks for your help.
tal

toufu · 20th August 2009, 05:54 AM

You are right, CViller's board is footprinted for BCS transistors which has the opposite orientation of the ZTX transistors. It's mentioned in his F5 build guide. Also, you might want to remove the current limit circuit which includes these transistors after you get it working. It sounds better.

qboneus · 20th August 2009, 04:37 PM

Thanks very much, I thought they must need to be postitioned this way; but just wanted to see if i was more confused than usual.
thanks for the info and opinion; i'll look into the current limit mod after i get her running.
cheers,
tal

cviller · 20th August 2009, 07:00 PM

qboneus, did my mails to you end up in your spam folder?

20th August 2009, 05:36 AM	#1
qboneus diyAudio Member Join Date: Oct 2003 Location: Montana	Question about proper orientation of Q5,Q6 F5 driver board cviller board rev 1.0, has markings blacked out. contrary to board markings using my meter it would appear the proper orientation of a ZTX550/ZTX450 in Q5/Q6 http://www.diodes.com/datasheets/ZTX550.pdf http://www.diodes.com/datasheets/ZTX450.pdf would be like this?? but not sure... can someone with experience advise me? Don't want to solder till i'm 100% thanks for your help. tal

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20th August 2009, 05:54 AM	#2
toufu diyAudio Member Join Date: Jun 2008 Location: San Francisco	You are right, CViller's board is footprinted for BCS transistors which has the opposite orientation of the ZTX transistors. It's mentioned in his F5 build guide. Also, you might want to remove the current limit circuit which includes these transistors after you get it working. It sounds better.

20th August 2009, 04:37 PM	#3
qboneus diyAudio Member Join Date: Oct 2003 Location: Montana	Thanks very much, I thought they must need to be postitioned this way; but just wanted to see if i was more confused than usual. thanks for the info and opinion; i'll look into the current limit mod after i get her running. cheers, tal

20th August 2009, 07:00 PM	#4
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	qboneus, did my mails to you end up in your spam folder?

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