Destroyer OS. said:
IIRC, RF was always eliminated by installing small cap between inverting and non invertin chip inputs. I never had this problem, but some customers had and that fix worked well.
Another thing, it seems that the amp with smaller caps at the chip is more sensitive to RF pickup. I've built numerous commercial amps in a past with large caps and none of them was picking RF.
Peter, i find the -computer as a transport- posts in this thread
very interesting. Enough to plow through the mountains of posts
over on the AA forum. The biggest problem with computers is the
available component parts change every 6 months (or sooner!)
By the time you have a stable test bed that's been tweaked for the
best sound - no one new to the game can duplicate your work,
because every part you used is no longer in production!
On the other hand i've been using your DAC since just about day
one (without turning it off), and it still sound great... YEARS later : )
m.
very interesting. Enough to plow through the mountains of posts
over on the AA forum. The biggest problem with computers is the
available component parts change every 6 months (or sooner!)
By the time you have a stable test bed that's been tweaked for the
best sound - no one new to the game can duplicate your work,
because every part you used is no longer in production!
On the other hand i've been using your DAC since just about day
one (without turning it off), and it still sound great... YEARS later : )
m.
moe29 said:
I remember, you were one of the first customers for NOS DAC
You can still get all the out of production stuff off an ebay, that's were I do all my shopping. Just the other day I received brand new GA-G31M-S2L (sourced in UK) and I'll be setting another system.
My present one is quite satisfying though, and runs fanless.
Attachments
I'll be using in system described in this post: http://www.diyaudio.com/forums/showthread.php?postid=1689863#post1689863
The CPU is E7200 and 1G of KINGSTON HYPER X RAM; couldn't source 512M but will also try regular Kingston RAM which in my current setup doesn't sound bad either, and RAM seems to make a difference indeed
The CPU is E7200 and 1G of KINGSTON HYPER X RAM; couldn't source 512M but will also try regular Kingston RAM which in my current setup doesn't sound bad either, and RAM seems to make a difference indeed
Two in one?
Dear Peter,
I am one of your many satisfied customers (using your Chip amp, phono stage and DAC). Is there, however, a possibility to add a USB input to the NOS DAC in addition to the ordinary input? Since the possibility of listening to music on the Internet is increasing, I want to connect my lap top to the DAC. Could it be possible to add a switch in order to move back and forth between the ordinary input from CDplayer/DAC-combo and an USB input?
Best wishes
Jan Ove from Norway
Dear Peter,
I am one of your many satisfied customers (using your Chip amp, phono stage and DAC). Is there, however, a possibility to add a USB input to the NOS DAC in addition to the ordinary input? Since the possibility of listening to music on the Internet is increasing, I want to connect my lap top to the DAC. Could it be possible to add a switch in order to move back and forth between the ordinary input from CDplayer/DAC-combo and an USB input?
Best wishes
Jan Ove from Norway
Well, the easiest way would be adding HagUsb and selecting SPDIF inputs to your NOS DAC: http://hagtech.com/hagusb.html
There are certain compromises here though, and if you want to do it really well, another option would be adding USB DAC front end board on top of your SPDIF DAC section and power both boards from a same PS. You can use two separate RCA pairs or just one and select either output with a toggle switch.
There are certain compromises here though, and if you want to do it really well, another option would be adding USB DAC front end board on top of your SPDIF DAC section and power both boards from a same PS. You can use two separate RCA pairs or just one and select either output with a toggle switch.
Attachments
It was a circuit posted here: http://www.diyaudio.com/forums/showthread.php?postid=1123520#post1123520
le´flu said:
Hi Ulf
The phono was a buy from Peter. He build the amp according to the schematics he gives a link to above. In an earlier post he also showed a picture of it: http://www.diyaudio.com/forums/attachment.php?s=&postid=1123223&stamp=1170434838
This is a very good phono amp. I love it very much. Since I got it almost two years ago, my CD player and Peter's NOS DAC have been rarely used
I use a Denon 304 moving coil mounted in an Audio Origami modified Rega RB250 on a DIY Lenco L75. The signal from the Denon has to be stepped up before the phono amp. When Peter uses S & B transformers to do this I use the more affordable Cinemag CMQEE-3440A transformers.
These were mounted in a small cabinet and plays very good.
An externally hosted image should be here but it was not working when we last tested it.
This item shows not the neat and tidy soldering and component placing you are used to see here in Peter's thread. Sorry....
Regards
Jan Ove
quick question about the 3875 board:
Can I expect to see any significant temperatures on the nfb resistor? I ask because I opted to mount it directly to the transistor pins on the underside of the board and as I'm building it is I notice it's going to be about 1mm from mdf in my enclosure.
I believe I used a 1W resistor but I may be mistaken and it could be 1.5W. I don't have it handy to check the part used.
Can I expect to see any significant temperatures on the nfb resistor? I ask because I opted to mount it directly to the transistor pins on the underside of the board and as I'm building it is I notice it's going to be about 1mm from mdf in my enclosure.
I believe I used a 1W resistor but I may be mistaken and it could be 1.5W. I don't have it handy to check the part used.
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