Question about proper orientation of Q5,Q6 F5 driver board

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qboneus

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Joined 2003
#1
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??
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

but not sure...
can someone with experience advise me?
Don't want to solder till i'm 100%
thanks for your help.
tal
 
#2
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.
 
#3
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
 
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