1 Reply by Phytopep

(17 replies, posted in Nintendo Handhelds)

nitro2k01 - Thanks.  Very helpful info.  The noise is definitely CPU-dependent, because it changes depending on what it's doing.  It reminds me of the interference I used to hear between a video card and Sound Blaster back in the DOS days...

InactiveX - I'm using fresh batteries.

I guess I'll break out the soldering iron and see what happens.

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2 Reply by Phytopep

(17 replies, posted in Nintendo Handhelds)

e.s.c. - That link is exactly what I'm comparing to.  The first non-modded DMG audio file on that page (the "play it loud" one, since the very first one is a broken link) is much, much quieter than my sample: -53 dB before the song plays, versus my -24 dB. That's a big difference.

If modding it will make this difference moot, I'm happy with that, I just want to have an idea before I start.

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3 Topic by Phytopep

(17 replies, posted in Nintendo Handhelds)

I picked up a Game Boy (DMG-01) on eBay and was testing it out before I attempted to solder in a "prosound" jack.  It seems very noisy to me. Before I spend time attempting to improve a defective Game Boy, can anyone tell me if this is typical of an unmodified DMG?

This recorded example has:
-66 dB of base noise from my sound card with no DMG plugged in
-23 dB of noise from LSDJ sitting idle
-24 dB of noise from LSDJ playing an empty sequence
-4 dB 50% pulse note played at pitch D3

Listen to recorded example (MP3)

Waveform and FFT spectrum zoomed in on 1000 Hz range:

Should I get another one?  Try to repair this one?  Go ahead and solder?

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