So can you explode this view at all so which pins are easier to see?? Thanks if you can. If not just where to get the detail. Thanks again. PC burson 5V regs will work for V1 and V2 is that right? I am going for the premium build from the start and I am still collecting BOM but you all have me really stoked for the results!
Steve
PS this is the ribbon laser mod with silver mica and mk caps
Steve
PS this is the ribbon laser mod with silver mica and mk caps
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Short leads mean low ESR - equivalent series resistance but also ESL - equivalent series inductance. This two parameters may influence capacitor + laser lowest resonance point. In other words, we need to keep noise over laser at the lowest possible level. Any induced noise due mobile GSM, radio HF, EMI etc. may affect laser operation and therefore CD reading.
As lower you keep the noise on laser and PIN detector, as much information you extract from CD with very low jitter.
If CD data is extracted without errors, than we do not need to perform C1 and C2 error correction and data stream is continuous with very low jitter.
X5R are cheap but very poor capacitors. In fact these are the worst MLCC you can get. In the last years, these capacitors have been restricted in military and life support application because exhibit huge piezoelectric effect, variation with temperature and potential applied.
When you put an X5R in a audio circuit you have two reasons: low cost is first and you are ignorant is second.
However there are applications (not audio) where X5R may be used with good performance.
What we have done here?
We killed any noise induced by these X5R bastards and performed proper decoupling cu high quality capacitors. Laser optical block is a place where vibrations are highest in a CD player. Beside musical program. optical tracking and focus, together with motors, are generating enough vibrations for these X5R capps to start induce piezoelectric effect noise.
The result is so obvious because X5R was a very poor engineering choice in this case.
Regards,
Tibi
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Thanks for the lengthy explenation.
Regarding the laser mount, I was looking at a Philips CDM model, but it seems the controller is specific to the laser/motor/etc.
Too bad, because some model have suspension.
I ve had the same conversation with my friends 100 times because the sanyo mecha looks silly simple and or even bad mechanically...
Still they do not know what to say when they hear it playing better than most other transports, other than that it sounds awesome... But they still do not like the idea of having it themselves... Meh who cares... I am a happy diyer smilling everytime I open my system. And I am exposed daily to extremely high end systems...
That is the beauty of DIY... and shigaclone is DIY at its best...
Give it a try. For the ~200 euros it requires for a full transport, I guarantee that you will not regret it.
Still they do not know what to say when they hear it playing better than most other transports, other than that it sounds awesome... But they still do not like the idea of having it themselves... Meh who cares... I am a happy diyer smilling everytime I open my system. And I am exposed daily to extremely high end systems...
That is the beauty of DIY... and shigaclone is DIY at its best...
Give it a try. For the ~200 euros it requires for a full transport, I guarantee that you will not regret it.
Guys is this the Vishay you used on the laser?
MKP1837410161F Vishay / Roederstein | Mouser
the photo is wrong. Please check the dimensions for reference.
MKP1837410161F Vishay / Roederstein | Mouser
the photo is wrong. Please check the dimensions for reference.
The last sentence, was that towards me or in general?
Currently I just cannot afford spending the money. Need it for other things.
C65 and C66 are in same place but different capacitor types.
C66 is marked to be a 1nF silver-mica or 1nF NP0
C66 is marked to be a 10nF foil capacitor
My preference is 1nF silver-mica.
Regards,
Tibi
When I used a salas configured for 500mA, the mecha could not even read the TOC. I would use at least 1A, and I suspect bigger ones might be even better for allowing the motors to move more efficiently.
By the way Tibi, now that we have started replacing those small thingies on the laser, how about getting rid of that ugly little potentiometer on the static blob side of the laser? I never liked it...
Probably it is trimmed for best performance in factory, but we can easily measure it and get an exact resistor, or replace it with a mice quality plastic multiturn trimmer. It is a 1K trimmer if I am not mistaken. Any thoughts?
Probably it is trimmed for best performance in factory, but we can easily measure it and get an exact resistor, or replace it with a mice quality plastic multiturn trimmer. It is a 1K trimmer if I am not mistaken. Any thoughts?
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I have ten MKP1837410161G coming. I'm not sure what the difference is between the F and the G for the last letter in the part number. They are Vishay, and 1%, so maybe it's a temperature rating? Do you think there will be a problem using these? Thanks guy's.
...I even wonder if it is trimmed (per boombox) at all....
I can remember at the beginning of the topic (long long ago) that some try to trim it better to see if they can minimise skipping. (The skipping was not due to this but poor new platform height)
I really like the idea of a resistor......because if you have to trim it after say 5 years of use your laser is probably a goner anyway
I think you have to give it a new try...use another platform with laser (15dollar).
You said you switched back to the original cap...I take it you did not solder the X5R smd back but picked a new platform ?
If so your answer lies there ...platform issues.
The skipping is not due to the cap I have the situation playing for say at least 20 hours with a variety of cds. These modifications are paramount
Last night my friend came over (mini PiTbull owner) and he listened to the standard laser and after a while to the modified laser...he had to pick up his jaw from the floor
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