Those resistors you linked to should be OK.
Hey Perry,
I finally got around to repairing this amp. So I replaced all the 0.1ohm resistors, all of the IRF540 and the IRF9540's.
The amp turns on the both channels play music but the right channel has static and sounds distorted.
Where is a good place to start?
Thanks for your help getting me this far.
Q120, 121 and those in similar locations in the circuit commonly fail.
R165, 166 and similar commonly fail.
All gate resistors commonly fail when the output transistors they drive fail.
D3 is likely a 33v zener in a sot-23 package.
See attached.
Perry,
Iam a little confused trying to find a replacement for D3 and the SMD resistors for R274 and R275. Iam not sure on the ratings. Is it possible for a part number?
Thank you!
Order by size and you will get the right power handling. They're likely 0805.
The diagram gives the power but the right size is good enough.
Thick or thin film will work.
Tolerance is the same as with through-hole. 3-value indicators = 5%. 4 indicators, 1%.
Perry,
Would this be a good replacement?
CHP0805-JW-200ELF Bourns | Mouser
Order by size and you will get the right power handling. They're likely 0805.
The diagram gives the power but the right size is good enough.
Thick or thin film will work.
Tolerance is the same as with through-hole. 3-value indicators = 5%. 4 indicators, 1%.
What value in the diagram gives the power rating?
The resistors are 0805 in size. That's all you need to order. The value is given in watts.
RM/10-200B - 1/10 watt 20 ohm.
RM3 for the 0.1 ohm source resistors (for comparison), are 3w.
Thank you for that Perry.
I found this:
CHP0805-JW-200ELF Bourns | Mouser
Would this be a good replacement for the amp?
Ok thank you Perry I will buy extras.
Would this be a good replacement for the D3 Zener Diode?
BZX84C33-7-F Diodes Incorporated | Mouser
Would this be a good replacement for the D3 Zener Diode?
BZX84C33-7-F Diodes Incorporated | Mouser
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