Famicom Sound Problems

[MBombchu]

If so, i guess i will leave it as it is, cause the famicom is only for collecting purposes

[MBombchu]

I found the problem. Its so dumb ..... my power supply was set to 12v . I now changed it to 7.5 and the problem is completely gone. Or would 9v be better ? I guess 7.5 is right at the limit what the 7805 can work with, but that means less heat i gues...

THANKS JPX FOR YOUR HELP NONETHELESS

[number47]

Still your 7805 is going to die soon. By specs some are able to handle even 35 or 50 volts on input leg (with a huge heatsink).

[MBombchu]

Will i be fine if i replace it with a 2amps 7805 (only one i can find in germany) ?

[jpx72]

Still your 7805 is going to die soon.

Why should it? If it works ok now, it will work. Even with 7,5V.
Post Merge: April 09, 2015, 03:47:30 am

...or you have bad adapter. Looks like voltage problem.

...hehe

[80sFREAK]

Still your 7805 is going to die soon. By specs some are able to handle even 35 or 50 volts on input leg (with a huge heatsink).

Just FYI, the bigger voltage input, the more unstable(selfoscillation) working voltage regulator.

[MBombchu]

So now this problem is out of the way, has anyone an idea why i cant get sound via cinch ?

[jpx72]

Have you tried everything mentioned?

[MBombchu]

1 only had 1uF capacitors at home, but shouldn't i have heard at least some kind of buzzing ?

[jpx72]

Sound signal goes through pin46 to the RF part. If your RF produces sound, the problem is between famicom and TV.
Post Merge: April 11, 2015, 06:26:53 am
Oh important thing - your TV won't start to produce sound if it hasn't video input first! Start with video output and then audio.

[MBombchu]

But i can use it to get louder sound from my 3ds ?!? Anyway i gonna try the av mod today

[jpx72]

Try it this way: plug anything (VHS, other console...) that produces video through composite cinch to the composite input of your TV - there are 3 female cinch holes, so use only the yellow. Take the pin 46 signal  and plug it to the white or red. When your TV has video signal (any signal), it should also enable the audio input and you should hear it.
Maybe it's not your case, if your 3DS can be heard from your TV's composite input without actual video signal present. But it's worth a try.

[MBombchu]

Thanks i will give it a try the next time possible