@UV101: Having seen your thread I went through the listing again and you are most probably right. It was mentioned that five LT1763-5 voltage regulators were used and as you said if that is the case it should be better than using the stock 7805 to supply the +5V to the circuits though the wiring are a bit messy.To be fair, it does look like there are multiple regs on that vero at the front and although its not that tidy, it will be better. Even lots of std 7805's will be better than 1 single one!!! Did this a few years ago in a Philips cd850 mki
I think that's 11 regs on the dac board lol!!
I'm not sure about all that screening tho. Why not just connect it to the top layer screen rare than wire all round the player.
For me I have doubt on the usefulness of screening the ICs and what I did was just sticking some copper foils on top of the ICs just for looking good
I went through the datasheet of LT 1763-5 at the following link:
http://cds.linear.com/docs/Datasheet/1763fg.pdf
It seems that LT 1763 is a relatively simple and effective voltage regulator that can supply a max. output current of 500mA. The noise is quite low about 20uV(rms) while the ripple rejection is about 65dB which is considered marginally good.
I noticed the input power is taken from the digital rail which is about 16V then there will be a voltage drop of 11V in the regulator and would make the actual current output to be less than 200mA. Nevertheless I think this should just be sufficient to supply the current to a single DAC, a single decoder or the servo IC (but definitely not all ICs together).
Not withstanding the workmanship I think the end result must be better than just using a single 7805 for all the +5V circuits.
http://cds.linear.com/docs/Datasheet/1763fg.pdf
It seems that LT 1763 is a relatively simple and effective voltage regulator that can supply a max. output current of 500mA. The noise is quite low about 20uV(rms) while the ripple rejection is about 65dB which is considered marginally good.
I noticed the input power is taken from the digital rail which is about 16V then there will be a voltage drop of 11V in the regulator and would make the actual current output to be less than 200mA. Nevertheless I think this should just be sufficient to supply the current to a single DAC, a single decoder or the servo IC (but definitely not all ICs together).
Not withstanding the workmanship I think the end result must be better than just using a single 7805 for all the +5V circuits.
nice work
lol we all aint that bad i flick my solder off a hot blow lamp.
nice work ian looks like a porcupines **** lol@UV101: Having seen your thread I went through the listing again and you are most probably right. It was mentioned that five LT1763-5 voltage regulators were used and as you said if that is the case it should be better than using the stock 7805 to supply the +5V to the circuits though the wiring are a bit messy.
For me I have doubt on the usefulness of screening the ICs and what I did was just sticking some copper foils on top of the ICs just for looking good
lol we all aint that bad i flick my solder off a hot blow lamp.
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The voltage drop across the reg is not relevant to the current being drawn by the device(s) it's supplying.
Also the supply is likely to be before the 5v reg which should by about 10v. That rail is for all 5v stuff (analogue and digital) and the positive rail for the servo and driver ic's
I suspect the volt drop,will be in the order of 4v under playing conditions.
Hi
I contacted the ebay seller about the listing yesterday afternoon asking him to mention the 'other' work he had done. Ian was correct with what we did (probably 2 years or so ago now) and what they had added themselves.
He is a good customer of mine and is selling the cdp on behalf of his brother who no longer uses cds. As far as I am aware the cd player works fine and probably just needs tidying up internally.
regards
Brent
I contacted the ebay seller about the listing yesterday afternoon asking him to mention the 'other' work he had done. Ian was correct with what we did (probably 2 years or so ago now) and what they had added themselves.
He is a good customer of mine and is selling the cdp on behalf of his brother who no longer uses cds. As far as I am aware the cd player works fine and probably just needs tidying up internally.
regards
Brent
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Snake Oil is actually very good for you
It was the Americans poo pooing the Chinese potion sellers back in the day to make their products look better. That is where the phrase comes from.Brent
lol@ ian
mmmm know that one mines american she,s never right if she was i,d know a house full
mmmm know that one
mines american she,s never right if she was i,d know a house full
lol@brent
cheers brent
just havin a jest @ some of the comments.Snake Oil is actually very good for you
Brent
cheers brent
I noticed you used 6800uF but mine is 22000uF and it may not fit into the location as yours. But I will try and see if I can do that.TY
It's shows you can fi some big caps into almost the original position with a little creativity!!!
Thanks. Will update when it is done.Make sure you change the diodes 1st if you are going to do that.
You can use hot glue to secure the caps
Yep, I use 22,000uF SI's in my own stuff, but it doesn't get the ROI on a player modded just to sell.
Those TSUPs are great VFM and they are not bad caps. They are a bit smaller than the big SI's though you are right
Will the mundorf 22000 caps go streight in or will the board have to be drilled