kevin gilmore

Very little current overhead when running correctly. Otherwise it goes into heat. Where else would it go. Unlike some other power supplies out there, this can be tested with absolutely NO load. Easier for people to put together. There is a fully shunt-regulated version of this that has been on the drawing board for a while. Justin was going to make an upgraded supply for the BHSE, i do not know if this is still in the plans. Not cheap. Cooks eggs for breakfast. The stability and ultra low noise is the key factor here. To do a dual tracking version (in this case, quad tracking version) gets even more expensive due to the 1kv isolation opamps necessary to get the control signals to the bottom rail. I could have saved one ref102 by using one for both the +250 and +500. This is not about saving a few dollars.

1) Noise reduction. Less than 1mv of noise on any of the high voltage lines. 2) output caps charge much slower, no massive input current peak to toast the pass fet. 3) limits output current in case of a tube short. Fuses unnecessary. For the 2 by 500 volt supplies, the one CCS could have been driven off of the center tap of the transformer, which currently is optional. Save about 2 watts that way. Maybe for round 2.

these are pictures of the pins i want. http://gilmore.chem.northwestern.edu/tagboards.jpg

I'll get a quote on some top and bottom panels machined out of pyrex and/or synthetic saphire. You probably won't like the price, but maybe i'll make one set just for fun. Top for the power supply, and bottom for the amplifer.

updated http://gilmore.chem.northwestern.edu/t2schempower.pdf http://gilmore.chem.northwestern.edu/t2schem.pdf (6ca7 resistor now R93) (have no idea how that happened) generated from the layout software http://gilmore.chem.northwestern.edu/t2bom.txt (realize that you have to multiply most stuff by 2 and battery parts x 4)

updated schematic for the power supply board with all known corrections. (i think) (its all really minor stuff, missing .1uf caps, wrong resistors for 555 timer) (labeled diodes, missing 2 diodes) http://gilmore.chem.northwestern.edu/t2schempower.pdf if someone finds more errors in the schematic let me know. At least the board is known correct.

Someone smart should buy up the singlepower domain when it comes due... Which would be in june of 2015... Probably too long to wait for a joke...

All 5 power supplies tested at 20% over load. At the same time. Prototype transformers definitely seem OK... Had to stop when the fluorinert jug started boiling... (where else do you put 5 high voltage dummy loads) http://gilmore.chem.northwestern.edu/t2powerboard.jpg

500 volt power supply tested, full power, 20 minutes. Total cold to warm variation .2 volts. Nominal output voltage, 500.1 volts. I have not fully stuffed the other 3 high voltage supplies yet. But they are all cuts and pastes of the 500 volt supply, so i'm stinkin happy over this. Will finish stuffing and testing tomorrow. I can't find the + and - 12 volt regulators Yeah Team...

7 more heatsink sets are machined. (plus the set i have, and the one set i shipped) I wanted to do some front/back panels this week, but was just too busy. Hopefully monday. I'm pretty sure i have all the remaining parts for the power supply board, so i should be able to power it up this weekend. justin should be shipping me more front/back material very soon. i already opened the holes for the 3381's a couple thousandths. fefore i shipped the boards to people... my test 3381's fit fine... There is no reason to cram it all the way to the circuit board, in fact it should sit about 3mm above the board.

What i mean to say is that all the circuit board/chassis sets are spoken for. I certainly have not shipped any of the chassis sets yet. They are not even done yet. This week i hope to do 2 more sets of heatsinks, then off they go to anodizing. Next week the same thing with the front/back panels. I may have to come in on a weekend or two to catch up.

All of the boards/chassis sets are now sold. Will keep the 2 people wanting units on the overflow list should one of the earlier people change their mind. I could do another run of boards, 10 minimum, but the price would go up a bunch. And i'm definitely NOT going to do any more chassis sets.

Yep you are right, teflon tubing... Not what i wanted. What i'm talking about is .5 inch high plated tin tubes that are solderable and have a round bump at the end so they stay put. I can get a picture of the old ones, but no idea who still makes them. Edit: i saw what i wanted to see, hoping someone had found those things

I really wanted to use those spacers, because i have seen them used a bunch of times, but i could never find the part number for those things. Please post the part number for the spacers. I think its a good idea that everyone use them.

Stax design 100%. The T2 clone amplifier is absolutely identical (every single part and value) to the original. Thats the point. My power supply is very different. There are a number of design changes i could have done. (like different current source) and a bunch less parts. But then it would not be a T2.

new solid state designs.... check ESX board to fit into the T2 with the T2 power supply.... check (although i doubt more than a couple of people are interested in this) portable fully balanced dac with 4 channel digital volume control to .1db and balanced dynamic amplifier.... working on it no time for sleep, need to make some Bok Tong Go... The first try at this was pretty much a complete failure.

DOH...

quick pic of real front panel. http://gilmore.chem.northwestern.edu/t2chassis28.jpg knob feels great. Only thing left to do on the chassis is determine where the 3 transformers mount.

More parts came in today. But still not all of them... Frustrating... anyway http://gilmore.chem.northwestern.edu/t2chassis26.jpg http://gilmore.chem.northwestern.edu/t2chassis27.jpg

Hopefully the parts i'm receiving this week will complete the amplifier chassis. Still missing a number of parts on backorder for the power supply.

Here is the way i look at this. And i'm about as anti-apple as anyone. With one of the remote desktop apps, and 3G this is the closest single piece thing i have seen that would allow me to connect to and interact with my real machines. Kind of expensive for just that purpose, but definitely worth it. The rest of what it does is completely useless to me. Others will come out with the same thing for much cheaper. Few will have the multi-touch and the led backlit screen, and 8 hours of battery life. Can't wait to see how much replacement batteries will cost when they die in a year. Other app that would be killer is a Crestron replacement at 25% the cost of a crestron.

Nope. Although that measures about .5mm Isn't a 5 digit digital mitutoyo digimatic a standard part of everyone's computer desk?? I have 3 on mine (different sizes) Plus a digital micrometer...

original omega connectors and the stax extension cable are both 19.25 mm my original O2's are 18.88 mm the sr-003's i have are 18.93 mm

The panel is .25 thick just like the real stuff. Some of the stax plugs are a bit larger than 18mm, so if i recess it then i have to machine a donut around it. Will try with the O2 plug later. The pins in the stax jack are already recessed about .05

So the test front panel. Need to adjust the depth of the blind screws a slight bit. Otherwise i'm definitely happy. http://gilmore.chem.northwestern.edu/t2chassis24.jpg http://gilmore.chem.northwestern.edu/t2chassis25.jpg