| | YM3438 in a Model 1 Genesis |  |
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evildragon
Posts : 13
Join date : 2013-02-24
| | Subject: Re: YM3438 in a Model 1 Genesis Wed Mar 06, 2013 10:09 pm | |
| - Drakon wrote:
- Awesome, didn't know you connect rd to vcc.
ahem,  - Quote :
- and RD pin attached to VCC
I said that earlier. lol | |
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Drakon
Admin
Posts : 1607
Join date : 2012-01-25
Location : Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Thu Mar 07, 2013 9:35 am | |
| - evildragon wrote:
- Drakon wrote:
- Awesome, didn't know you connect rd to vcc.
ahem,
- Quote :
- and RD pin attached to VCC
I said that earlier. lol Yeah I never read it earlier. Just more proof that a schematic makes it easier to see things. | |
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evildragon
Posts : 13
Join date : 2013-02-24
| | Subject: Re: YM3438 in a Model 1 Genesis Sat Mar 09, 2013 8:21 pm | |
| Kinda lazy though don't you think, to not read it? I mean, I worked with TmEE completely through words and even I figured it out.
Anyway.
Here's a better audible sample that shows how much clearer the Sonic 2 logo's twinkle is.
STOCK YM2612: http://www.mediafire.com/?qyana9z2tt6y6ld
MOD YM3438: http://www.mediafire.com/?arnancoja9jnknw | |
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Grambo
Posts : 116
Join date : 2013-01-30
Age : 38
Location : Saskatchewan, Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Sat Mar 09, 2013 9:14 pm | |
| I've ordered a YM3438  Your schematic and samples have been quite helpful, evildragon, thanks again. I'm going to throw a DPST switch in so I can flip between chips on the fly. | |
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Drakon
Admin
Posts : 1607
Join date : 2012-01-25
Location : Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Sun Mar 10, 2013 10:26 am | |
| Toggle switch would work you're only changing 2 connections. | |
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Grambo
Posts : 116
Join date : 2013-01-30
Age : 38
Location : Saskatchewan, Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Wed Mar 27, 2013 10:44 pm | |
| Welp, pretty sure I just blew my 1145 doing this. Maybe some other components too.
Shame too, I just got the audio circuit all working with an op amp, rather than the 1034. Worked great.
Mixed up the ACC and AVCC so that the AVCC and RD were connected. Poof, lots of smoke. Dead.
I should be grateful, I suppose... it's been a long time since I've blown something up.
Always remember to triple check your work before you plug in your VCC, kids.
FAACK | |
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Drakon
Admin
Posts : 1607
Join date : 2012-01-25
Location : Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Thu Mar 28, 2013 7:54 pm | |
| That sucks. I always use a red wire for vcc. | |
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Grambo
Posts : 116
Join date : 2013-01-30
Age : 38
Location : Saskatchewan, Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Thu Mar 28, 2013 11:50 pm | |
| Yeah... after messing around with the op amp situation for a good couple hours and getting it all working, I thought I'd just quickly toss in the YM3438 with the DPST toggle switch while I was at it.
So close to finally leaving that thing sealed up for good. New one's on the way :P | |
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Grambo
Posts : 116
Join date : 2013-01-30
Age : 38
Location : Saskatchewan, Canada
| | Subject: Re: YM3438 in a Model 1 Genesis Fri May 03, 2013 1:01 am | |
| Got it all done.
Was having the same crappy impeded noise as on the beginning of this clip: http://www.mediafire.com/?j9scynj7kmll9n1
(Becomes an issue at 0:03 once the game switches on the chip)
Used 100uF caps instead of 10uF and I found it helped reduce the noise. Still isn't completely gone, but it's pretty unnoticeable when music and SFX are playing.
Does anyone know what might be causing this? It seems to change level and frequency, depending on the game.
Maybe a decoupling cap would help? | |
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