but...   but... it can be so 'spensive.......  

Added my name. Ordered a bunch of ubal - bal boards because I saw the small size and I assumed it would be pretty cheap.

On 1/27/2017 at 6:25 PM, kevin gilmore said:

remember that there is both a dynamic and electrostatic current feedback amp.

using the bh power supply on the dynamic amp is going to result in much magic smoke.

I'll be adding the electrostatic one and the bh psu

Spreadsheet updated with the CFA (electrostatic) and the BH Ultramini HV PSU

I think closing the group buy on March 3rd will work unless anyone objects.  I'll confirm all the gerbers and get preliminary board prices in the next week or so.

Is there any interest in source switching? KG just posted this.

http://gilmore.chem.northwestern.edu/boards/baseboardbal3.zip

I could certainly use it...  I'll add it to the list

any chance for some quotes in the sheet? 

yep, I should have time to work on that tomorrow

I updated the gerber list, can someone take a look and make sure it's right

On 2/20/2017 at 5:36 AM, sorenb said:

any chance for some quotes in the sheet? 

I should be able to put some preliminary quotes up tonight

The price is up for all but the input switch, split GRLV set, and the Dynalo Mini with TKD pot.  I'll get the mini quoted, just waiting to see if the numbers increase on the switch and the GRLV split set.

At some of these prices it's probably worth getting some extra in case I screw up soldering.

yeah, the buffer boards are like $0.68  I'll price out the rest in a day or two

I should have the pricing up for the source switch and the split GRLV today or tomorrow.  I'll close out the group buy on Monday morning March 6th then send for the final quotes based on the numbers at that time.

I updated the cost of the switch board, that one we're close enough to make the cost reasonable.  The GRLV split sets we're only at 5 total.  Doesn't look like there's enough interest for that one to add it to the order unless the number goes up

I just want to be clear on the input boards. Is the price for a set (=2xPCBs) or is it per PCB. I put down 2 to indicate 2 PCBs. Otherwise I need to change mine to 1 because I don't need 4 channels.

Yes, Price of switch board is per set or unit? I thought on single Pcb too.

It's per set...  One board is one channel correct?

Ok, I need more projects like I need another hole in my head but what the hell..  

sbelyo, being a noob here, should I be sending you a payment now? (total at end is partial from what I can see)

53 minutes ago, MrSlim said:

Ok, I need more projects like I need another hole in my head but what the hell..  

sbelyo, being a noob here, should I be sending you a payment now? (total at end is partial from what I can see)

We'll wrap up the group buy early next week.  I'll get a final quote on the boards and update the prices.  You can pay after it closes, no need for it now since the prices will lower a bit

Super, thanks!

There were some changes to the switch board.  Just double checking that we're ready to go.  I'll close it up as soon as I get confirmation

Dynalo with this switchboard would be a good preamp what do you think ?

Yes, I believe the original idea was something like that with the Balanced\Unbalanced board in the middle with an attenuator.