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Old 6th May 2008, 10:43 PM   #2031
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Tolu, this has already been under discussion several times at this same thread here... take a look backwards...
Almost everyone came to the conclusion that it must be bogus... already the ebay sale sounds fishy, not to talk about the incredible price... somewhere was a link to a website of them aswell, with more bla-bla talk...
it seems they are trying to make you believe that they are able to elevate output of the PS1 by double, only by doing some kind of software mod to the chips in the digital domain... so that the motherboard stays physically unmodified... BUT the thing is: the AK4309 has a limited output voltage by design... read the datasheet... you can't just elevate the digital signal and hope that the output will pass it's specs... and even if it would pass, there's a reason for them limiting it: would probably have lots of distortion, or would overheat the IC or something...
Ah, and I don't want to know what happens to the sound quality if they apply gain in the digital domain... remember what happens beyond 0dBFS? yeah sure...
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Old 7th May 2008, 03:13 AM   #2032
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Quote:
Originally posted by joydivision
Sure, if you can get yourself a good priced new laser unit, then that's the way to go. But first, be sure that your playstation works ok, except for the laser...
I mean, at least find some CD it doesn't distort, and let it play for some hours, to be sure sound is good, and no other malfunctions.

It doesn't distort, on i'd say 95% of pressed cd's. I have a 5502 unit here too, i havnt plugged it in yet though, I'm thinking a possible laser swap

-Justin
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Old 7th May 2008, 04:21 AM   #2033
mluckow is offline mluckow  United States
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Quote:
Originally posted by despotic931


It doesn't distort, on i'd say 95% of pressed cd's.

-Justin

Justin,

What kind of distortion do you have on the other 5% of pressed CDs? Does it sound like a scratched-up LP? Just curious.

Mike
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Old 7th May 2008, 05:26 AM   #2034
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The distortion sounded the same on the pressed cds as it did on the cd-rs, it sounded like a scratchy form of clipping. Not soft clipping at all, but rather like a hard square wave, very harsh. I was assuming it was a problem with the gain setting. However having moved and not taken on any projects since moving, I've kept my multi-meter is packed away in storage. I do however have another psx in my possession (a 5501, not a 5502 as previously stated). Lacking a multi-meter at the moment I was thinking I was going to have to wait till I could get to my storage to dig mine out, but instead I had an idea (I know how dangerous those can be!)...

I plugged in the 5501 and tested it out, it played my cd-rs fine, although didn't sound as warm as my 1001 in my opinion. Knowing that the 5501 worked though meant that I knew it's laser unit was functioning properly. I opened them both up and proceeded to swap the laser units. First up was the laser unit from the 5501 connected to the 1001, hmmm worked fine. Then I fired up the laser unit from the 1001 connected to the 5501, it worked but still had a minimal amount of distortion. This meant the distortion traveled with the laser unit from my 1001. So there where two options, either the 1001 laser unit was bad, or the only adjustment on the actual unit itself (the intensity) was out of wack. I decided to hope that the problem had to do with the adjustment being out of wack and plugged the 1001 laser unit back into the 1001 ps. I then decided as well that I would just tweak that adjustment a little without a meter or anything, just to see if it improved the situation (I figured it couldn't get any worse, hehe). I turned it a little clockwise, hmmm, less distortion. I turned it a little more, hmmm even less distortion! One more little turn and the distortion was completely gone! Then one more turn for good measure, this last turn was a bad idea, as the distortion came back even worse! So, back a turn and now everything is working fine! I still plan on digging my meter out and checking values, but I'm just happy to be able to report it has played everything I've put on it since this little experiment! A few more test, and me digging my equipment out of storage, and the modifying and tweaking will commence!

-Justin
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Old 7th May 2008, 07:30 AM   #2035
Tolu is offline Tolu  Germany
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Default Output level

Hi

how much dB is the difference between 1.4Veff (PS1) and 2Veff ("normal" CD-Player)? Can anybody show the calculation?

Thanks!
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Old 7th May 2008, 07:06 PM   #2036
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Tolu,
your values are not very correct...
normal CD player output is around 2V RMS, that's a little less than 6Vpp.
According to datasheet,
AK4309 outputs 2,8Vpp, that's around 1V RMS only...
AK4310 outputs 3,4Vpp, that's around 1,2V RMS...

So, you need a gain stage of about 2 for the AK4309, and about 1,7 for the AK4310.
To convert that to dB, do a quick search on google for the formula, I'm too lazy to that hehe
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Old 7th May 2008, 08:12 PM   #2037
Tolu is offline Tolu  Germany
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OK!

Than please give me the correct values in Veff.

The calculator can you find here:
dB calculator
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Old 7th May 2008, 09:03 PM   #2038
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Tolu,
Veff is the same as RMS (=root mean square)...
According to your calculator site, that gives around +6dBV gain needed...
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Old 7th May 2008, 09:14 PM   #2039
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OK, I did it.

AKM4309 = 3.4 Vpp = 1.2 Vrms = 1.2 Veff = 3.8 dBm

CDP = 5.64 Vpp = 2 Vrms = 2 Veff = 8.2 dBm
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Old 7th May 2008, 09:30 PM   #2040
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I am not sure, but I think you have to choose dbV, not dbm...
At least if you are going to talk about voltage gain of output stage and stuff like that...
but anyway, I've already told you the gain values
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