Jump to content

Recommended Posts

Posted
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)

Posted
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

  • Like 1
Posted

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

 

  • Like 7
Posted (edited)

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
  • Like 1
Posted
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?

 

Posted (edited)

 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
Posted

Well its the one I have......

the CCS LED/10k resistors go to ground instead of each other

and Servo eats DC at the output

That's all I noticed.

 

Posted

I used the first one I found and  it was close enough to trace out the board and label it.

Do not see a link here for Diffinput3.pdf

I do  have a draft copy with sim graphs on it.

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.