mosfet getting hot !!!

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djronbxs

Member
Joined 2006
Hi,

I have an amplifier and it has 4 mosfets which are paired (2sc3182 & 2sa1265) after a while 1 pair of these mosfet are getting hot the others get normal hot. can somebody tell me how to adjust the quescient current and how to calculate it or what is wrong please ?

thanks
ronald
 
I

ilimzn

Member
Joined 2005
djronbxs said:
i think they are MOSFET.
no i dont have chematics !:(
Click to expand...

You may think what you want, but they are not.
MikeW gave you a polite hint, and even provided you with a datasheet link, I'll give you a less polite one: 2SA, 2SB, 2SC, 2SDxxxx are all bipolar transistors, marked according to japanese standards (JEIA). 2SA and 2SB are PNP, 2SC and 2SD are NPN. Under the same standard, (MOS)FETs are marked 2SJxxxx (P ch) and 2SKxxxx (N ch).
Poking inside amps without knowing the basics is asking for trouble!
 
anatech

anatech

Administrator
Joined 2004
Paid Member
Hi djronbxs,
AndrewT is right. If it was a quiescent current problem, the transistors woud get hot while idling (quiescent state). It does appear to be a load related problem.

Have you tried swapping the speaker leads (amp turned off!).

-Chris
 
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