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Is anyone building the KGSSHV? - Page 20

post #286 of 452

Its balanced.  The + input and the - input should both go to ground.

There are 500k resistors on board that do this, but the noise would

be much higher if the inputs are not tied to ground.

post #287 of 452
Quote:
Originally Posted by kevin gilmore View Post

Its balanced.  The + input and the - input should both go to ground.

There are 500k resistors on board that do this, but the noise would

be much higher if the inputs are not tied to ground.

 

Grounding is ok, there is static like noise, it is quite though not loud. Yes the transformer noise is cut out when signal is passsing through, ground is taking effect.

 

Does this design use caps to eliminate DC offset noise from the inputs, or is that what the offset pot is for?

 

EDIT:

 

Switched RCA cables, static noise is gone. My RCA cables were not shielded.


Edited by HDMan - 6/8/12 at 8:20pm
post #288 of 452

Just for the sake of clarity, the KGSSHV is fully DC coupled so the offset pot is there to trim the DC offset at the output.  Unlike dynamic transducers, excessive DC voltage will not destroy electrostatic drivers but it should be kept as low as it possible. 

post #289 of 452

Want to buy my Khozmo for cheap? I am building the AMB instead.

 

http://www.head-fi.org/t/613653/khozmo-quad-attenuator

post #290 of 452

.

post #291 of 452

Well, Khozmo reimbursed me my money on their defective pot, no questions asked.

I was within 45 days of my Pay Pal purchase however and when he did not return my emails I opened a dispute.

He still did not answer and I escalated to a claim.

A few days later I got my money back.

The Goldpoint works great and I am quite content with the number of steps. With iTunes volume all the way up I then use the attenuator to control volume. No hum or hiss. 


Correction: there is noise with the attenuator all the way down, only in the first step. Not sure yet how to fix that since without grounding the pot I was unable to control the volume.
From step 2 to 23 is a noise free as it gets.
Edited by gilency - 6/13/12 at 12:33am
post #292 of 452
Quote:
Originally Posted by gilency View Post

Correction: there is noise with the attenuator all the way down, only in the first step. Not sure yet how to fix that since without grounding the pot I was unable to control the volume.
From step 2 to 23 is a noise free as it gets.

 

I had the same problem at step 1, I fixed it by following Justin's instructions on another forum.

 


"XLR pin 1 should not be connected to star ground,  it should be connected to the chassis through the shortest path possible.  how you connect the chassis to circuit ground elsewhere is another story.

as for the metal body of the attenuator, i would have it conduct to the chassis and dont try to wire it anywhere."

 

So I grounded the XRL pin 1 to the XLR mounting screw, took the Khozmo star ground out of the loop and it is grounded directly by touching the chassis. This has worked for me, no more noise at zero volume and as quite as a mouse, completely black background even at full volume.


Edited by HDMan - 6/14/12 at 9:35pm
post #293 of 452

You meant Justin, right?

Thanks, I am planning on fixing it over the weekend.

My attenuator won't work without the ground leads connected though. Already tried that.

post #294 of 452
Quote:
Originally Posted by gilency View Post

You meant Justin, right?

Thanks, I am planning on fixing it over the weekend.

My attenuator won't work without the ground leads connected though. Already tried that.

 

LOL, yeh Justin.

post #295 of 452

My transformer (SumR) began buzzing. The amp is otherwise working great.

I rechecked to make sure is well tightened to the chassis.

Is this a potential problem I should worry about?

post #296 of 452

Are you using an SSR?

post #297 of 452

I am using the relay G8P-1A2T-F-DC12


Edited by gilency - 6/16/12 at 12:11am
post #298 of 452

I had a problem with a 25A ssr the transformer had a loud 50hz buzz, I switched to a 40A unit and the buzz instantly ceased.

 

http://relays.te.com/appnotes/app_pdfs/13c3206.pdf

post #299 of 452

Even with the transformer removed and connected directly it still buzzes though.

post #300 of 452

1/2 wave halogen dimmers will cause dc in the line. Same with florescent lights. Switching power supplies on the same line as the audio transformer can cause dc disturbance.

 

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