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-   -   Diamond Differential Amplifier (http://www.diyaudio.com/forums/solid-state/244892-diamond-differential-amplifier.html)

apexaudio 27th October 2013 10:01 PM

Diamond Differential Amplifier
 
2 Attachment(s)
Idea for full symmetrical amplifier...

moschfet 27th October 2013 10:16 PM

Wrong schematic? ;)

Mark Johnson 27th October 2013 10:29 PM

1 Attachment(s)
The "bias spreader" circuit is not fully symmetrical. I have attached a figure from US Patent 3,995,228, issued 30 Nov 1976 to Nelson S. Pass of Threshold Corporation. It shows a bias spreader circuit which IS fully symmetrical.

apexaudio 27th October 2013 10:51 PM

Quote:

Originally Posted by moschfet (Post 3682145)
Wrong schematic? ;)

This is not final schematic, if you find some mistakes...

moschfet 27th October 2013 11:04 PM

Quote:

Originally Posted by apexaudio (Post 3682185)
This is not final schematic, if you find some mistakes...

No, but this is not a Diamond circuit.

apexaudio 27th October 2013 11:23 PM

Quote:

Originally Posted by transistormarkj (Post 3682162)
The "bias spreader" circuit is not fully symmetrical. I have attached a figure from US Patent 3,995,228, issued 30 Nov 1976 to Nelson S. Pass of Threshold Corporation. It shows a bias spreader circuit which IS fully symmetrical.

I will use symmetrical bias circuit in final schematic.

borys 27th October 2013 11:47 PM

3 Attachment(s)
Maybe You can use similar topology as krell ksa 100.
Few examples bellow + diamond amp I have made recently.
For two first stages maybe it would be handy to use ccs instad of zeners supplies ?

Or idea nr 2:
-j-fet differential amps (I have used them even in ax11/sansui amp with no changes in circuit)
-bjt differential amps
-Vas
-driver
-output stage


One question, why 4 differential amps ? Two amps (as ksa100) + predriver+vas+driver+output stage should be good too.

PMI 28th October 2013 12:03 AM

Quote:

Originally Posted by borys (Post 3682237)
Maybe You can use similar topology as krell ksa 100.
Few examples bellow + diamond amp I have made recently...

BG3 looks like a very cool design, at least from the schematic, :up::)

OnAudio 28th October 2013 06:27 AM

Thank you Apex for all you do for audio. Thanks for posting. Just a few quick ones
Are you using +-45V rails ? . I suppose diamond stands for in house name of this amplifier :) ?

kind regards,

Harrison.

aparatusonitus 28th October 2013 07:57 AM

Quote:

Originally Posted by moschfet (Post 3682199)
No, but this is not a Diamond circuit.

You are right...it's Diamond Differential circuit (Sansui), as in the title.;)


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