Peter Daniel said:
Peter
Lovely piece of work.
How did you accomplish the additional turns on the Plitron. Is this a custom build by Plitron, or a customization you have made?
Do you have an opinion on the performance of this power source vs the normal hammond transformer on the DAC board?
I just added turns myself using Vampire 21ga enameled wire from Percy. I had to remove epoxy filling and it's 27 turns for DAC chip and 20 turns for input section (9V and 6V AC respectively).
I didn't compare the differences tranformers make , but when I listened to that particular amp was I quite impressed how good the USB source sounded.
It seems that placing the DAC inside the amp is a good move and I'll be building one like that for myself as well.
I didn't compare the differences tranformers make , but when I listened to that particular amp was I quite impressed how good the USB source sounded.
It seems that placing the DAC inside the amp is a good move and I'll be building one like that for myself as well.
Peter,
Your work is so inspiring. I knew that USB version was going to be a hit. I'm still enjoying my non-USB version of your DAC. Someday, I may make the move, however, since the SB3 has only digital RCA outs, that will be sometime since I like the Squeezebox software. I've just finished putting the final touches on a power supply for the SB3 using your PS boards fit with Jensen 4 pole capacitors. I'll post a picture here when its fully soldered together.
Best,
Anand.
Your work is so inspiring. I knew that USB version was going to be a hit. I'm still enjoying my non-USB version of your DAC. Someday, I may make the move, however, since the SB3 has only digital RCA outs, that will be sometime since I like the Squeezebox software. I've just finished putting the final touches on a power supply for the SB3 using your PS boards fit with Jensen 4 pole capacitors. I'll post a picture here when its fully soldered together.
Best,
Anand.
LM3875 with 34Vdc power supply
Peter,
I bought some components with you before and I have completed a chipamp based on LM3875 using these components.
The amp is now powered from 34Vdc and I understand it will give me more power than if is under 25Vdc. The Lm3875 can handle the higher voltage with no problem at all. Also I really don't need the higher power. My transformer is restricted to give me 34Vdc unless I design a drop down voltage regulator to 25vdc.
My question to you is that will the amp improve the sound(eg. giving me a better high freq. response, ie maybe add a little of sparkle at the top *) if I revert to the norminal voltage of 25Vdc. What is you experience on this and your comments?
Thanks.
* I use biamping and lm 3875 is used to drive the tweeter/mid range, ie a compression drive and horn combo.
Peter,
I bought some components with you before and I have completed a chipamp based on LM3875 using these components.
The amp is now powered from 34Vdc and I understand it will give me more power than if is under 25Vdc. The Lm3875 can handle the higher voltage with no problem at all. Also I really don't need the higher power. My transformer is restricted to give me 34Vdc unless I design a drop down voltage regulator to 25vdc.
My question to you is that will the amp improve the sound(eg. giving me a better high freq. response, ie maybe add a little of sparkle at the top *) if I revert to the norminal voltage of 25Vdc. What is you experience on this and your comments?
Thanks.
* I use biamping and lm 3875 is used to drive the tweeter/mid range, ie a compression drive and horn combo.
Bluto said:
Well, making good photos is an art and I usually shoot 20 images or so and choose the best ones. The light is most important, and most of the images are made with natural light, often using tripod.
Few years ago I was using Olympus C-4040, later switched to Canon Pro-1 and beginning this year all my pics are from Canon 40D and 50mm lense.
ttan98 said:
The power vs supply voltage relationship is presented in attached graph.
I did some tests before, where I was using Variac to change supply voltage and comparing the sound with different PS rails.
It was my conclusion (and two other assosiates) that the amp sounded overall better with higher voltages: more dynamic and alive.
If you use the amp for mids and highs only, the lower voltage may provide more smoothness, but it all has to be checked in a given system taking into account listener's preferences.
All my amps are built with 2 x 22V AC transformers, which gives approx 33V rails. In my personal system I run amps in bridged configuration so such voltage levels are actually preferred.
When I was using battery power, and having choice of either 2 x 12 or 3 x 12V (per rail) I always opted for the latter.
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