big1
I bought mine from diyAudio member Kovax in Croatia. Took about 12 days to arrive and work a treat.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=126566
I bought mine from diyAudio member Kovax in Croatia. Took about 12 days to arrive and work a treat.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=126566
Gooch said:
Your Dell charger is likely a fairly well regulated 19.5-20V or so. There will be almost no loading on it as it is likely 3A-6A rated. I would position it a good fisical distance away from the B1 as it will emit switching noise your systen will pick up. Also filter it better with some film caps.
udailey, how did you know?!?! We just walked through a discussion of our December scheduling, which will be hectic. I asked him where my time off comes into the schedule because he has me involved in just about every hot project.
Everyone: I'll have some photos up soon of my B1 build as it progresses. I've already got the main board populated with caps, resistors, relays, etc.
I spent last night on getting my bridge rectifiers and caps populated...coming together nicely. This weekend will probably be spent in the garage drilling holes in the chassis on my drill press.
flg said:
Your Dell charger is likely a fairly well regulated 19.5-20V or so. There will be almost no loading on it as it is likely 3A-6A rated. I would position it a good fisical distance away from the B1 as it will emit switching noise your systen will pick up. Also filter it better with some film caps.
You most have one of those power supplies you pretty much nailed it. I order the parts I didn't have on hand now I have to come up with some type of chassis for it.
Thanks again for all the help
My B1 is an ugly, Manhattan style version -- but does it perform quite nicely -- this is the THD% graph with only 18V -- when I run it at 32V the THD% averages about 0.00066%
An externally hosted image should be here but it was not working when we last tested it.
Gooch said:You most have one of those power supplies you pretty much nailed it...
Thanks again for all the help
I might have a few around here... I used to work in the off Line switcher bis. Used to build protos and demos. You can find some that are 8-10A. Save those for a power amp
Now I play with DC-DC stuff. 12V to 1.2V
Not much use except for putor stuff 
Gooch said:
It can run on a voltage up to 24V.
What you really ought to want, is a shuntreg
Here and onwards
It simply sounds crisp, transparent and very enjoyable.
Manhattan style B1:
at Vcc's from 10 to 32V
An externally hosted image should be here but it was not working when we last tested it.
at Vcc's from 10 to 32V
An externally hosted image should be here but it was not working when we last tested it.
Hi Jackinnj,
I use a gyrator based regulator named Teddyreg on my two B1 units and in my next one I plan to use it after a SMPS that I got from a broken printer. Please look at this:
http://www.acoustica.org.uk/
Scroll down to "using 3-pin regulators, part 2"
Cheers,
M.
PS: do your FETs get hot at 32V?
I use a gyrator based regulator named Teddyreg on my two B1 units and in my next one
I plan to use it after a SMPS that I got from a broken printer. Please look at this:http://www.acoustica.org.uk/
Scroll down to "using 3-pin regulators, part 2"
Cheers,
M.
PS: do your FETs get hot at 32V?
maxlorenz said:Hi Jackinnj,
I use a gyrator based regulator named Teddyreg on my two B1 units and in my next one
http://www.acoustica.org.uk/
Scroll down to "using 3-pin regulators, part 2"
Cheers,
M.
PS: do your FETs get hot at 32V?
If the TeddyReg can handle 48VDC input I have a box full of switching PS sitting in storage looking for a home.
giantstairs said:
and Manhattan budget!
where'd you get those Spragues? and more importantly, how does it sound?
The Spragues I purchased for a project which needed a high quality sample-hold -- they are polycarbonate. I didn't have a polystyrenic of such high value (10uF). I have also used them with true RMS converters. I bought them from a distributor who was flushing his inventory of bulky discretes a couple years back so have a box of them!
Polycarbonates -- the jury is all over the place on how they sound compared to polypropylene, PET, polystyrene etc. Some really like the sound of the Russian PS caps.
Mouser used to carry this value Spragues.
It isn't "sounding" anything at the moment. I am going to use it as a buffer in a JFET preamp. At the moment there are some unresolved issues, however...
One thing about filtering the output of the cap multiplier -- or 3 pin adjustable regulator -- bypassing the adjust pin knocks down noise, but it also worsens transient response.
steenoe said:
It can run on a voltage up to 24V.
What you really ought to want, is a shuntreg
Here and onwards
It simply sounds crisp, transparent and very enjoyable.
Thanks Steenoe for pointing me to that thread good stuff the reg looks very cool.
You wouldn't have one of those shunt reg PCB that you might want to part with?
Cheers
Dave
Dear Jackinnj,
Thanks for the tip about Adj pin. I have also put a zener instead of L317 before the gyrator and it sounds good to me. I have not compared the two version face to face yet...
Dear Troystg,
48V is too much for the LM317...see datasheet. But you can lower it a bit with high W resistor first, I guess...even lower ripple.
I have used it safely with 34Vin.
Cheers,
M
Thanks for the tip about Adj pin. I have also put a zener instead of L317 before the gyrator and it sounds good to me. I have not compared the two version face to face yet...
Dear Troystg,
48V is too much for the LM317...see datasheet. But you can lower it a bit with high W resistor first, I guess...even lower ripple.
I have used it safely with 34Vin.
Cheers,
M
which will have about a 30V supply...does it have to be regulated?
