kevin gilmore

lm49830 is a chip amp do you mean opa1632 and its clones, all of which require huge amounts of feedback and have all sorts of common mode dc issues

diamond buffers will stand vertical on that board. there are thru hole versions of both pieces already

moar better 2.65 x 2.27 inch

some people are going to have trouble assembling this, same size for comparison see updated picture below

correct

yep, gets the output impedance down to say 5 ohms. then you can add some resistance to match the cables you intend on using, +45 or +70 ohms

for soren, thru hole version with servo

I never said this was a tiny amp. Nor low power.

start laying out your own boards and you will know why. there will be a all smd version at some point with these as output buffers .8 x 1.5 inch

it had better look like this the output impedance is about 1k, working on the diamond buffer output now

boards at the speed of light. updated version of the board with input resistors just posted. by adjusting a few resistors you can get up to 6db (12db balanced) gain

no no no, swimming pool, it floats

this is coming soon http://gilmore.chem.northwestern.edu/diffinput2.pdf a lot less parts than the other version, almost the same thd

seems linear systems is now shipping matched p-channel duals that match the lsk689 so jfet front ends may be possible again. could do a pot in the middle for current mirror types of front ends. problem is you need reverse taper pots.

yep, i don't have the source file here, which i would normally have, will look at home. definitely kerry's layout. found the original email

i don't even remember that one, will have to look later

no, you are a dinosaur. same as me. i still use pure analog oscilliscopes when ever possible.

nice.

This is the headphone version of beveridge. 1350 volts bias, probably a couple hundred volts of music, single stator.

so the 2 piece version will be capacitor coupled output, the 4 piece version will be dc coupled output, the newest version of cast and cascode fet buffer. for balanced you will need 8 pieces. i'm sure a version of this is coming. as far as I know, no dsd but it should be capable of that. pricing is finally rational

can't use lt1021-5 in 2 wire mode.

10V reference on 13.5 v leaves only 3.5 v on the current source. not sure that would give the lowest noise. but you would have to try it

if either marc or nate decide not to, I would be interested in one of them just to mess with.

current mirrors used as voltage gain stages is very different from high power versions used as output stage. as far as I know bakoon is one of the very few that make transconductance headphone amps. It really works well only with very flat impedance headphones like ortho's.