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CMOY ---> Szekeres

post #1 of 5
6/20/10 at 5:23am
Thread Starter 

I know I'm missing something, but I just don't see how this is working??

  

http://i460.photobucket.com/albums/qq329/Fred_fred_2004/CIMG8357Small.jpg

 

Using a tread type powersupply to power both a simple Cmoy and a simple Szekeres amp,

 

source (sansa) to cmoy input, cmoy output to Szekere's input, this should stuff up the cmoy VG and it does big time, before connecting 5 volts in each rail after 10volts and zero volts,

 

sound is not affected if fact sounds very good

 

Nothings getting hot heatsinks are warm to touch

 

no cross talk when I disconnect 1 channel

 

I just didn't expect it to work

 

any thoughts??

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post #2 of 5
6/20/10 at 7:39am

Hi Fred

 

The signal return from the headphones is returned to power ground, not virtual ground.

The virtual ground from the CMoy ends at the input of the Szekeres.

 

Next step...enclose the Szekeres in the feedback loop...


Edited by Avro_Arrow - 6/20/10 at 8:25am
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post #3 of 5
6/20/10 at 11:06am

Nothing unusual.  The Szekeres is simply a current follower as opposed to an actual amp, so the CMoy is acting as a voltage gain stage followed by a szekeres current buffer.  Why not have an active ground channel for the CMoy so that you can have a DC coupled output?

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post #4 of 5
6/20/10 at 3:06pm
Thread Starter 

Hi

 

The VG is tied directly to the ground on the szekeres, so it doesn't end at the cmoy it gets dragged down to the neg rail, as they both use the same power source, I could see it working if they had seperate power supplies but here the both share the same power

 

cheers

FRED

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post #5 of 5
6/20/10 at 4:11pm

Here Fred...try this one...

 

Signal Channel

 

CLASS A SIGNAL CHANNEL.JPG

 

Ground Channel

 

CLASS A GROUND CHANNEL.JPG

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