Balanced to unbalanced board

[MLA]

Am looking at it but I don't see the input resistors (file diffinput3 right?).

[kevin gilmore]

it had better look like this

the output impedance is about 1k, working on the diamond buffer output now

Edited January 20, 2017 by kevin gilmore

[MLA]

Now it does. Thanks! Must have been the cache of my browser acting up.

[mtoc]

Pardon me, how to wire the boards?

why O+   one one side,   i+ on the other?

       GND                        GND

       -i                              O-

[kevin gilmore]

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

 

Edited January 22, 2017 by kevin gilmore

[kevin gilmore]

for soren, thru hole version with servo

 

[Pars]

start laying out your own boards and you will know why.

+1



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[sbelyo]

Now we're talking...  So if I understand that would go after the output from the unbalanced\balanced to balanced board.  Is that correct?

[kevin gilmore]

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

[cspirou]

It looks like the buffer is single ended. So would you need 4 diamond buffers for 2 balanced channels?

[kevin gilmore]

correct

[MLA]

On 2017-01-22 at 1:38 PM, kevin gilmore said:

there will be a all smd version at some point with these as output buffers  .8 x 1.5 inch

 

Really looking forward to that! 

Edited January 23, 2017 by MLA

[kevin gilmore]

some people are going to have trouble assembling this, same size for comparison

see updated picture below

 

 

Edited January 23, 2017 by kevin gilmore

[kevin gilmore]

[MLA]

6 hours ago, kevin gilmore said:

 

some people are going to have trouble assembling this

 

Possibly, but it's still fantastic!!!

Edited January 24, 2017 by MLA

[kevin gilmore]

moar better  2.65 x 2.27 inch

 

Edited January 24, 2017 by kevin gilmore

[luvdunhill]

Now you just need a second on the other side of the board

[MLA]

24 minutes ago, luvdunhill said:

Now you just need a second on the other side of the board

Or a diamond buffer or two ... (or are they better off separated?)

Edited January 24, 2017 by MLA

[Pars]

I would think that incorporating the diamond buffers for balanced would be the way to go. Do you have a schematic for this board as well?
Broken record time... Any chance of including footprints for 0.1" Molex KK connectors as well?
Good time to duck now


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[sbelyo]

Am I going to need an oven for my birthday?  Or, will there be a through hole version with the diamond buffer included?  Ducking as well  If not I'll be fine with four or the through hole buffer boards and the unbal board

Edited January 24, 2017 by sbelyo

[kevin gilmore]

diamond buffers will stand vertical on that board.

there are thru hole versions of both pieces already

[mtoc]

any possibility to make these two new input output boards smaller than ever before while making them still be better than all the versions which released last year? (small size saves money)

[MLA]

For all intents and purposes, that's exactly what just happened.

[sorenb]

how does this compare to the 49830? (I know it's obsolete, but still)

[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