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Balanced to unbalanced board


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Messing with this tonight. Its playing into balanced ortho's. the gain is stock at 2 and its just enough, not real loud but sounds just great! yes this is meant for Pre duty, this is on

So I did end up using a female header socket and air wiring the ground. The part number for the 4 pin right angle header is 68016-404hlf. The leds I used are extremely bright orange-red, glad once i c

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  

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On 2017/1/28 at 10:33 PM, kevin gilmore said:

unbalanced to unbalanced, gain of 1

unbalanced to balanced, gain of 2

 

is it possible to make BAL-BAL into zero gain? Just like SE-SE, it's unity gain (When BAL-BAL is 0db gain, SE-SE is -6db gain, is this correct)

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37 minutes ago, cspirou said:

To power 2 ubal/bal boards and 4 diamond buffer, is one GRLV enough?

 checked my through hole one, (full size) its just under 200ma total with two inputs and four buffers

one GRLV is enough for several of these

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Messing with this tonight.

IMG_20170211_224441189.jpg

Its playing into balanced ortho's. the gain is stock at 2 and its just enough, not real loud but sounds just great!

yes this is meant for Pre duty, this is one way I test them.

that 12va transformer is too small, but was just sitting here. 20-25va would be better.

GRLV is set for +-18V heat sinks are 35C,  with 4V of regulation

the buffer's are setup for 18v & that way I can use the cheaper servo's

room is 20C, buffer output transistors are 40-46C, transformer 42C

 

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Way old will have to look at it. If it has the 4pdt relays, those are obsolete

board file posted, everyting is the dpdt relays.  So you stack 2 for stereo, and use rca to xlr adapters for the unbalanced inputs otherwise it gets stupid complicated

Edited by kevin gilmore
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On ‎03‎/‎02‎/‎2017 at 4:03 PM, sbelyo said:

If I wanted to make a preamp with these boards can I omit the attenuator and wire it like this?

For example:

 

Pre.jpg

I would like to do something similar... I want send SE signals (cd and radio) to my KG electrostatics amps vía balanced.

Can I use the 2x gain for balanced signal or I need change it for 1X?

 

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 Kevin's SMD layout, adapted a bit for my methods

                                                                                                               Servo's work

Clipboard02.jpg

155587.jpg 

 

                                                         and a  plug in buffer with 1W MPSW transistors (for Turbo)

diamuff4.jpg

IMG_20170223_153647928_HDR.jpg

It seems that I like buffers............

Edited by congo5
change schematic
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