Donkey Kong "siren" problem (not the nintendo hum!)....

Here we go, Mark Spaeth acting like a !$%!$!~ again.

I lack the knowledge and skills to assist the OP, otherwise I would.

Mark, how about you actually offer up some genuinely useful suggestions here to assist the OP? Or are you afraid you might actually suggest something inaccurate?

I just don't get it....

I agree. I really hope this thread doesn't go sideways. The OP is looking for some genuine help.

While I don't personally have this issue with my DK board, it would be really fantastic to document a fix. This same issue could happen to other boards in the future so isolating the problem could benefit others down the road.

So many great DK PCB issues have been documented with a fix, let's hope this one gets added to that list.
 
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Yet you've helped nobody in this thread, even though you stated that it was an easy fix.

This site has a report post function, please use it. The other party did.



Op, if it is the lm724 you suspect lmk I have a tube of them somewhere.
 
in that case, what is the fix?

Simple1.jpg
 
Just because you don't understand enough of what I post to be helped doesn't mean other people aren't helped.

I have not read this entire thread and I usually let Mark know when he's being mean but I dont think he is this time. He's right, that sound is usually because the jump sound hasnt completely decayed. As to why? I'm not sure... Need to look at a schematics.

If the sound board is disconnected from the amp and the noise is still there its the amp. If not the caps on the amplifier board than probably the transistors.

Going back to finish reading the thread.
 
ok, read the entire thread and re read the OP's first post.

Its not the jump sound, its some sort of oscillation from the sound output. I wonder if that transistor is switching on and off and this is what we are hearing?

I've noticed the sound with boards in a cabinet but never on my test bench.
 
what's the fix?

i'm sure OP would appreciate the information. thanks.

My moneys on that he doesn't know how to fix it.
Otherwise why be a pretentious prick the poor OP who's just trying to fix his game.

Its like proving that god or the easter bunny do or don't exist.
Hell for that matter I have a three foot dick.
Im not going to show it to you though, you will just have to take my word for it.
He can claim he knows how to fix without any sort of proof or anything, all he wants to do is fuels his superiority complex.

If he post how to fix it ill recant my statement, but I doubt it.
 
wanna know what I would do???

I'd start messing with the value of those caps. But thats just me.
 
i thought maybe a "kill-'em-with-kindness" type approach might work

we'll find out one way or the other if he's human yet

My moneys on that he doesn't know how to fix it.
Otherwise why be a pretentious prick the poor OP who's just trying to fix his game.

Its like proving that god or the easter bunny do or don't exist.
Hell for that matter I have a three foot dick.
Im not going to show it to you though, you will just have to take my word for it.
He can claim he knows how to fix without any sort of proof or anything, all he wants to do is fuels his superiority complex.

If he post how to fix it ill recant my statement, but I doubt it.
 
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