Thanks for the summary.
I think the option for me would be the new HG modules as Jan-Peter says. But that's starting to look like a new amp project then. I'll have to make up my mind if I need another pair of amps
Fortunately that is not urgent, since the UcDs I have now are clearly good enough to keep me from "needing" something else.
I'm looking forward to hear what you guys can make of the new "pimped up" HG modules with add-on regulators. They look tempting.
I think the option for me would be the new HG modules as Jan-Peter says. But that's starting to look like a new amp project then. I'll have to make up my mind if I need another pair of amps
Fortunately that is not urgent, since the UcDs I have now are clearly good enough to keep me from "needing" something else.
I'm looking forward to hear what you guys can make of the new "pimped up" HG modules with add-on regulators. They look tempting.
sorry for the delay! the children are needy!!
im using the unbalanced version as all of my sources are unbalanced anyway, the transformer is 9-0, 9-0, 9-0, 9-0-9, (1.2a each) giving 11.5v dc rails which is adequate for most users, the pre ive modified as it had a 317 feeding a 7805 (9v pre and 5v sec) so ive removed the 7805 and now planted a pga2320 - 9v should give 3.5-4vrms handling (18-2/4) which should be adequate for my dv89's HDCD output at 4vrms, anyways I have no buffer at the moment the preamp is hooked directly to the modulator of the ucd's coupled with a pair of capacitors to block the dc (measures 250mv without! and zero with) to be honest it sounds awsome, the seperation is great and it drives any old crappy speakers as if they were logans or something! but not very loud without a buffer, I am thinking of adding a lm4562 to the spare 9-0-9 winding but I need a decent circuit and regulator and have to read some forums, ive had good results using shunt regulators but ive only copied designs for 5v rails.
im using the unbalanced version as all of my sources are unbalanced anyway, the transformer is 9-0, 9-0, 9-0, 9-0-9, (1.2a each) giving 11.5v dc rails which is adequate for most users, the pre ive modified as it had a 317 feeding a 7805 (9v pre and 5v sec) so ive removed the 7805 and now planted a pga2320 - 9v should give 3.5-4vrms handling (18-2/4) which should be adequate for my dv89's HDCD output at 4vrms, anyways I have no buffer at the moment the preamp is hooked directly to the modulator of the ucd's coupled with a pair of capacitors to block the dc (measures 250mv without! and zero with) to be honest it sounds awsome, the seperation is great and it drives any old crappy speakers as if they were logans or something! but not very loud without a buffer, I am thinking of adding a lm4562 to the spare 9-0-9 winding but I need a decent circuit and regulator and have to read some forums, ive had good results using shunt regulators but ive only copied designs for 5v rails.
Hi all,
anyone tried the new Hg modules? Looking forward to experiences and tweaks which are best applicable to these!
The pic is of my 4 channel UcD400 with 2 channels AD & 2 new HG channels.
The AD modules are lightly tweaked with Panasonic FC's, no decoupling caps and opamps fed through the HGsupply.
The HG modules are like they left the factory yet, only removed the decoupling caps.
Any comments on the way I built the amp are welcome, hope to learn from 'em, and maybe to improve the amp! It will be used to power a semi active three way loudspeaker system
A few questions:
-which of the tweaks as proposed in this very long thread are most usefull to apply to my modules? (soldering musn't be to difficult)
-I've a pair of these: http://www.twistedpearaudio.com/lcps/lcps.aspx fot hte active crossover I'm trying
do you consider these bettrer than the 12V hypex HG supply and is it worth the effort to try to feed the opamps with 'em?
I'm not going to share impressions concering the performance of my amp with you yet since I'v harly listened to the new modules..
thanks in advance
anyone tried the new Hg modules? Looking forward to experiences and tweaks which are best applicable to these!
The pic is of my 4 channel UcD400 with 2 channels AD & 2 new HG channels.
The AD modules are lightly tweaked with Panasonic FC's, no decoupling caps and opamps fed through the HGsupply.
The HG modules are like they left the factory yet, only removed the decoupling caps.
Any comments on the way I built the amp are welcome, hope to learn from 'em, and maybe to improve the amp! It will be used to power a semi active three way loudspeaker system
A few questions:
-which of the tweaks as proposed in this very long thread are most usefull to apply to my modules? (soldering musn't be to difficult)
-I've a pair of these: http://www.twistedpearaudio.com/lcps/lcps.aspx fot hte active crossover I'm trying
do you consider these bettrer than the 12V hypex HG supply and is it worth the effort to try to feed the opamps with 'em?I'm not going to share impressions concering the performance of my amp with you yet since I'v harly listened to the new modules..
thanks in advance
An externally hosted image should be here but it was not working when we last tested it.
Re: UcD Power supply problem
not sure if im on the right track but at a guess i'd say it could be a problem with the fet switching to much ground (caused by dc and other), I imagined that a faster fet would not solve but improve the deficiency that has been spoke of, look up 'supply pumping' in the ucd questions thread its when the single ended amp conducts both supply rails increasing both rail voltage.
bruno3955 said:
not sure if im on the right track but at a guess i'd say it could be a problem with the fet switching to much ground (caused by dc and other), I imagined that a faster fet would not solve but improve the deficiency that has been spoke of, look up 'supply pumping' in the ucd questions thread its when the single ended amp conducts both supply rails increasing both rail voltage.
crd
hi does anyone know enough about the crd to comment on what would be good for the purpose (ucd180) im having trouble getting hold of some SST511 and so looking at this http://www.vishay.com/fets-small-signal/SSFsgcrdP/
what would work well ????
and has anyone used it with lm4562
also can it be done on a pga2320 or compatable
hi does anyone know enough about the crd to comment on what would be good for the purpose (ucd180) im having trouble getting hold of some SST511 and so looking at this http://www.vishay.com/fets-small-signal/SSFsgcrdP/
what would work well ????
and has anyone used it with lm4562
also can it be done on a pga2320 or compatable
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