introducing the black hole

[luvdunhill]

Sure, both are made by Semilab.

[kevin gilmore]

http://gilmore.chem.northwestern.edu/blackholebd.jpg

The critical stuff fits.

Now on to massive parts ordering binge.

[fierce_freak]

Did you get your massive parts orders in?

[kevin gilmore]

Yep, that one is virtually done too. I've been spending time on other stuff, but the

prototype definitely works. And works well.

[ujamerstand]

Any more progress in this area? I'm in the market for a nice and cheap instrumental amp.

[kevin gilmore]

just have not had the time to test the final version.

i can give you the board layout, have a few made and test.

Biggest problem is that i'm moving my lab beginning of august, and

i'm working 10 hour days in prep.

Plus the stax mafia seem to be doing every possible electrostatic

tube amp at the moment, all at the same time.

Edited June 13, 2012 by kevin gilmore

[ujamerstand]

So... How do we mount the chip to the sink? Drill two holes on the Ohmite sinks and screw it on?

[kevin gilmore]

Buy the ohmite clip that is designed for the heatsink

You also need a thermal insulator because the tab is

Electrically hot.

Will post the part number later.

[ujamerstand]

Ahh. I see. The R2 series stuff?

[kevin gilmore]

this is the mouser part number

532-CLP212G

[ujamerstand]

Great! Will add it to my BOM. Also, what's the bjt between the output transistors?

[kevin gilmore]

BD139

[ujamerstand]

awesome, I have a bag of those.

[jose]

I'm sorry to rescue this old thread.

I've seen some schemes in the Stax mafia circuit boards but I don´t know if this ampli step finally "production". The fact is that I would not mind doing one of these amps and maybe someone else is attracted to the proyect.

[kevin gilmore]

The company that made the output transistors went out of business 

[jose]

Do you mean OPA541?

Mouser has stock (OPA541AP) from TI. OPA541AP

 

[spritzer]

No, the opa is an IC, not the transistors Kevin referred to.

[jose]

Oh I'm sorry

I was looking at this scheme and I thought it was about that Opa. I guess it's a dead end.

 

Edited October 25, 2018 by jose

[spritzer]

Wasn't that the pile of shit Ray did? 

[jose]

1 hour ago, spritzer said:

Wasn't that the pile of shit Ray did? 

I'm not sure if that's Ray's amp. I have not found documentation about the Blackhole on "Stax mafia circuit boards", only references to the dark/dork star.

[kevin gilmore]

that was ray's darkstar amp. the blackhole is something different.

the blackhole uses a national semiconductor driver chip lme49830 and a pair of alf16P/alf16N semisouth fets for the outputs. 

You can probably substitute something else for those parts, including bipolars, as the board has options for that too, but I never tested that way.

the darkstar sounds absolutely miserable, and these days has stupidly large voltage swings guaranteed to set just about anything on fire.

the blackhole is suitable as a small speaker amp.

Edited October 25, 2018 by kevin gilmore