Hi Ianpadman said:
Using a screw driver, slightly open the black plastic over the switch and pull it off.
Unfortunatelly the plastic disc on top of the mech is not centerd in many players.... Mine wobbles a lot also.
Ricardo
ccschua said:
hehehe ok lah this my latest upgrade just replace with 2 discrete opamp call EARTH from audio-gd sound is more open , detail and got more energy .... i can say better tha opa-627
i try to removed the muting transistor i can hear the different but not very huge improve
An externally hosted image should be here but it was not working when we last tested it.
Hi Brentrowemeister said:
That is what I thought first.
Can you please answer to my last post ?
I have been analysing your CDP and see that you have some upside down spowers on Decoder digital and analog.
Can I do a similar implementation based on LM340AT (I am saving for the spowers) without the GND mods you made on the decoder ?
Can I feed HF Amp and Decoder Digital from the same TX winding ?
Ricardo
I think the regs were upside down due to room issues!!
More regs the better, you can't make it worse seperating rails only better.
Yes you can supply both from the same winding, the decoder demands very little current.
Brent
More regs the better, you can't make it worse seperating rails only better.
Yes you can supply both from the same winding, the decoder demands very little current.
Brent
Can I do it without the GND Mods ?
The regs will be connected to the PSU and GND to star GND... but do I need to connect Decoder GND to star GND ?
Ricardo
The regs will be connected to the PSU and GND to star GND... but do I need to connect Decoder GND to star GND ?
Ricardo
rowemeister said:
yeah .. but they got 3 type EARTH/MOON/SUN all are different character
EARTH - NEUTRAL
SUN - Dynamic/sound forward
MOON - WARM like tube feel
wanna ask abt the regulator LM337 both are the same ?
An externally hosted image should be here but it was not working when we last tested it.
L700 said:
LM337 - 3-Terminal Adjustable Negative Regulator (Used for -12v reg)
LM317 - 3-Terminal Adjustable Regulator (Used for +12v reg)
Thank you Brentrowemeister said:
I will report the differences.
Hope the gains are enough so I can loose the BIG cap setup I am using in C815.😀
rowemeister said:
Those are not Burson jobbies. The design came from audio-gd. Here
http://www.audio-gd.com/enweb/pro/diy/OPA.htm
U may want to try OPA Sun, which is more dynamic and more detail. Ground wire connection is absolute, else vocal will sound muddle.
Marantz 63 with these OPA move 2 steps up the ladder.
Nice solution by L700 with a step ladder.
Hi Brent
This is going to be fun again.......
After reading carefully your´s and Lee´s pdf, I notice a difference.
There are two Digital +5v and one +5v analog inputs in the Decoder.
Do you feed Pin 15 and Pin 44 from the same spower ?
I am quite afraid to experiment because inittially I replaced C513 by a 150uF Oscon and all I got was screeching sounds... no music... so I believe Vdd1 is very critical.
Lee is using one sreg on U179 and one 47uF NxHiQ on C513.... As I do not have one of those caps, can I use a 10uF Oscon ?
Please take in consideration I will be using LM340AT.
Regards
Ricardo
This is going to be fun again.......
After reading carefully your´s and Lee´s pdf, I notice a difference.
There are two Digital +5v and one +5v analog inputs in the Decoder.
Do you feed Pin 15 and Pin 44 from the same spower ?
I am quite afraid to experiment because inittially I replaced C513 by a 150uF Oscon and all I got was screeching sounds... no music... so I believe Vdd1 is very critical.
Lee is using one sreg on U179 and one 47uF NxHiQ on C513.... As I do not have one of those caps, can I use a 10uF Oscon ?
Please take in consideration I will be using LM340AT.
Regards
Ricardo
RCruz said:
I just used those 47uF BG's on all the digital lines basically. I wouldn't worry too much about it.
What PDF of mine are you looking at? i don't remember making one, lol.
Cheers, Lee.
Hi LeeThomo said:
I do not have those caps.... Can I use one 10uF OsCon or a 220uF BGSTD or a 220uF Ruby ZA in place of C513 ?
One year ago, while I was starting and just replaced some caps, I put a 150uF OsCon there and the result was disastrous.... No music.... Just an horrible screeching sound.... Now the original ceramic is still there.
In your pdf below you replaced U179 by a sreg... can I do the same but using a LM340AT ?
Can you please explain why Pin15 is not preceeded by a resistor like R508 and R511 ?
Regards
Ricardo
LOL. Where did you find that? That was one of my first attempts at a cd63.
Maybe the screeching was caused by using a polar cap instead of a bi-polar. Not absolutely sure, but don't worry about it, I don't remember it making any difference at all. Brent still has the std ceramic there, and his player aint too poor sounding.
Lee
edit: Don't follow that list too closely. I was still quite a noob when I did it, everything may not be correct.
Maybe the screeching was caused by using a polar cap instead of a bi-polar. Not absolutely sure, but don't worry about it, I don't remember it making any difference at all. Brent still has the std ceramic there, and his player aint too poor sounding.
Lee
edit: Don't follow that list too closely. I was still quite a noob when I did it, everything may not be correct.
Thomo said:
But I am not sure brent is powering Pin15 independently.
If I put a reg in U179, Can I leave C513 as stock ?