Peter,Peter Daniel said:
What is he using the potentiometer for? Is it just an input signal attenuator? (looks like an Alps?)
The twin external PSUs may be a bit of overkill, but it looks great! Is he using a regulated, or snubberized PSU in each one.....or just the rectifier boards? Any pics inside the PSUs?
The design is extremely nice, and very carefully executed. Very reminescent of some of your incredible case work. Those have to be the shortest heatsink fins I've ever seen, but the effect is stunning!
Robert
Mr_Empa said:
PG+, PG- and OG are all connected on amp board (with ground plane). The chassis is usually connected to earth ground (third pin from AC connector) and the amp ground connects to the chassis through 10R resistor.
eVITAERC said:
Some of the parts are special order from Digi Key. I will try to deal with it this week (including Dales from Mouser), so probably end of next week I might have some kits available. From what I hear now, with my test unit, this is a very good sounding circuit.
It's really hard to say what would be the best: it shouldn't be too low, and shouldn't be too high, maybe 22k would be a good choice?
After all, it's close to what Placette is using in active version of what is claimed to be the finest linestage available: http://www.placetteaudio.com/active_line.htm
I'm presently using their passive volume control unit and it's indeed very good, actually better then a single series Vishay ( or Caddock TF020) with a DACT in shunt position.
After all, it's close to what Placette is using in active version of what is claimed to be the finest linestage available: http://www.placetteaudio.com/active_line.htm
I'm presently using their passive volume control unit and it's indeed very good, actually better then a single series Vishay ( or Caddock TF020) with a DACT in shunt position.
DAC Receivers
I used a socket for the receiver on my Greenboard DAC so I could compare the CS8412 and the CS8414.
I can hear no difference at all between the two. Of course I can not do a true A-B comparison because I only have the socket on one Greenboard, so I have to listen to them one at a time by changing recievers back and forth....not the best comparison.
I guess I could compare the CS8414 in the Greenboard with the CS8412 in one of my All-In-Ones using my A-B switch, but some of the other components are different as well.
Robert
Peter,Peter Daniel said:
I used a socket for the receiver on my Greenboard DAC so I could compare the CS8412 and the CS8414.
I can hear no difference at all between the two. Of course I can not do a true A-B comparison because I only have the socket on one Greenboard, so I have to listen to them one at a time by changing recievers back and forth....not the best comparison.
I guess I could compare the CS8414 in the Greenboard with the CS8412 in one of my All-In-Ones using my A-B switch, but some of the other components are different as well.
Robert
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Hey Peter where did you get those blocks of copper you used in several installations?
I am planning on my amplifier and have decided to go with an acrylic case. I want to use two copper blocks. I was planning on one copper block to separate the transformer and channels, and one more to separate the channels. I also have a damping pad for the transformer. I guess the last question is where to buy copper sheet to wrap the transformer in and a piece for the top?
I am planning on my amplifier and have decided to go with an acrylic case. I want to use two copper blocks. I was planning on one copper block to separate the transformer and channels, and one more to separate the channels. I also have a damping pad for the transformer. I guess the last question is where to buy copper sheet to wrap the transformer in and a piece for the top?
Peter Daniel said:
Do you order it in? I don't see that size buss stock in the Vancouver area stores but might just be missing it.
Peter, don't know if you've been following the 'Blowtorch' thread in Solid State but someone posted this approximate schematic of the power supply:
http://www.diyaudio.com/forums/attachment.php?s=&postid=823671&stamp=1137934683
What do you think of the pre-regulator handling of the dual secondary transformer? Has the dual full bridge + common mode choke layout been tried with your Gainclone boards yet? Worth a shot?
I never order on line, I go to the store and ask them to order for me, if it's out of stock. This size bar is indeed rare and not common stock.
Regarding the preregulator filtering in Blowtorch, I'm using exactly same configuration in a DAC (with addition of 20R series resistors tight after chokes) and it works very well.
I'm not sure if it would work in a GC, as current draw is changing depending on the power. Besides, the GC PS arrangement seem to work well already ( it is better than batteries), however, it never hurts to try.
Regarding the preregulator filtering in Blowtorch, I'm using exactly same configuration in a DAC (with addition of 20R series resistors tight after chokes) and it works very well.
I'm not sure if it would work in a GC, as current draw is changing depending on the power. Besides, the GC PS arrangement seem to work well already ( it is better than batteries), however, it never hurts to try.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.