rowemeister said:
I agree to a certain extent. Of course Naim can't be doing things too badly.
This is definatly and improvement in audio over a small pcb with 4 regs and small toroid, trust me i've built an millions (err alot anyway lol)I'm sure if i could squeeze this psu into the unit then the benefits would be greater. This psu does have a rather large Toroid in it.
So basically two identical psu with one inside and one external the internal one will give better gains. But a good external will be better than an average internal IMHO
Brent
Hi.
External power supplies are nothing new. One of the original articles on modding the CD63 used one.
http://www.acoustica.org.uk/t/63/63hacks3.html
Maybe it provides better mains filtering due to the large toroid?
Andy
I installed a new XO in my Marantz Cd-53 MKII. It worked very well with the power supply recommended by Guido Tent.
When I try to build a better PS with this schematic http://www.acoustica.org.uk/t/naim/35clockreg.html
The CD player refused to work even though the voltage supplied is measured at 5V. ( I use 1/2 of NE5532 instead of AD797)
When I switch back to the Guido Tent's PS it works fine.
Can anyone explain this to me? Is something wrong?
When I try to build a better PS with this schematic http://www.acoustica.org.uk/t/naim/35clockreg.html
The CD player refused to work even though the voltage supplied is measured at 5V. ( I use 1/2 of NE5532 instead of AD797)
When I switch back to the Guido Tent's PS it works fine.
Can anyone explain this to me? Is something wrong?
rowemeister said:
I've put up some new pictures here: www.raylectronics.nl, under SA8400 modifications. I even have an english section
.Ray
This is very strange. I have run this XO can with two other PSs without any problem. However it did not work with the Flea. The measured voltage on the XO supply pin when the CPD is turned on (with the Flea) was about 4.9VDC. However the transport did not read any discs.
Some differences between my PSU any the Flea schematic:
- half of a NE5532 is used in stead of an ad797
- I use a 2 V red LED
Some differences between my PSU any the Flea schematic:
- half of a NE5532 is used in stead of an ad797
- I use a 2 V red LED
6h5c said:
Re: Re: Re: Re: Re: Re: Re: Re: Spindle motor problem
Hi all,
Received the VAM 12.1 laser unit last week and mounted it an hour ago. Dusty in Memphis (hey, it's sunday) is playing for the second time so the problem is cured. Thanks Ray, Lejos is a good source for parts indeed. Recommended to all.
It might be my imagination or could it be possible a new laser unit gives better results? Music seems to have more 'resolution' than before. Going back for some more m u s i q u e now.
Regards, Jaap
6h5c said:
Hi all,
Received the VAM 12.1 laser unit last week and mounted it an hour ago. Dusty in Memphis (hey, it's sunday) is playing for the second time so the problem is cured. Thanks Ray, Lejos is a good source for parts indeed. Recommended to all.
It might be my imagination or could it be possible a new laser unit gives better results? Music seems to have more 'resolution' than before. Going back for some more m u s i q u e now.
Regards, Jaap
Re: Re: Re: Re: Re: Re: Re: Re: Re: Spindle motor problem
Oh yeh, forgot to ask:
The minimal instructions that go with the VAM 12.1 mention adjustments to make with regard to tracking and laserpower. Is it wise to have the old scope from the attic to measure amplitudes of sine and square waves from the pick up?
Oh yeh, forgot to ask:
The minimal instructions that go with the VAM 12.1 mention adjustments to make with regard to tracking and laserpower. Is it wise to have the old scope from the attic to measure amplitudes of sine and square waves from the pick up?
Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Spindle motor problem
Ah, that's good news, one more player back on track. Maybe the increased resolution is caused by a stronger HF signal? Less noisy maybe?
The only adjustable thing is the laser current, with the small pot that's glued on the flex-foil. It's done by measuring the amplitude of the RF signal with the scope, and adjusting it to the value stated in the service manual. I always check it, sometimes the current is a bit high. But the vertical part of your old scope may not be accurate enough to use it for measurements. You can check it with a known DC voltage, and if you use a 10x probe, make sure it's properly adjusted.
Regards,
Ray
disco said:
Ah, that's good news, one more player back on track
. Maybe the increased resolution is caused by a stronger HF signal? Less noisy maybe?disco said:
The only adjustable thing is the laser current, with the small pot that's glued on the flex-foil. It's done by measuring the amplitude of the RF signal with the scope, and adjusting it to the value stated in the service manual. I always check it, sometimes the current is a bit high. But the vertical part of your old scope may not be accurate enough to use it for measurements. You can check it with a known DC voltage, and if you use a 10x probe, make sure it's properly adjusted.
Regards,
Ray
quantran said:
Hm, very strange. If you have a scope, take a look at the voltage. You may have an oscillation problem. Your DMM tells you it's 4.9V but there may be a nice HF sinewave present on top of that voltage. The 5532 shouldn't be a problem. It might be a good idea to ground the inputs of the other half that's not used. If you didn't adjust the voltage divider, a red LED may generate a voltage that's a bit on the low side.
Which caps did you replace, you mean the analog filter caps around the opamps? They should not influence the operation of the player, only the sound. Maybe those caps were not the cause and another problem is present. It could be the flexcables.
Ray
Thanks Ray,
Unfortunately, I don't have a scope. May be I will ask my friend to check it for me.
These are the orange 0.1uF and 0.047uF capacitors in the digital / transport control section. I replaced them with RIFA PHE426 series (same value) and the player didn't work with these RIFAs.
Anyway I realy like this player. I also moded the analog section with WIMA FKP caps, all 1% metal film resistors and Nichicon Muse PS caps.
I replaced all electrolytics in the digital section with ENLA RJH series --> good results.
Now I only use it as a transport. It's very nice that the laser unit can be replace easily for ten bucks.
6h5c said:
Unfortunately, I don't have a scope. May be I will ask my friend to check it for me.
6h5c said:
These are the orange 0.1uF and 0.047uF capacitors in the digital / transport control section. I replaced them with RIFA PHE426 series (same value) and the player didn't work with these RIFAs.
Anyway I realy like this player. I also moded the analog section with WIMA FKP caps, all 1% metal film resistors and Nichicon Muse PS caps.
I replaced all electrolytics in the digital section with ENLA RJH series --> good results.
Now I only use it as a transport. It's very nice that the laser unit can be replace easily for ten bucks.