Thor, an all discrete Lateral FET Headphone Amplifier. - Page 8

qusp · 16th March 2012, 08:28 PM

true, i run balanced all the way mostly (4 channels), the only amps i'm toying with 'balanced' input are the lateral fet 'wire' power amp and LPUHP, both of which showed improvements in distortion with balanced input. i havent built either up yet so we'll see

Neutrality · 01:45 PM

I made a little board with a WM8804 SPDIF receiver, ESS9023 DAC, volume pot, 3.3V regulators, onboard rectifier.

Needed something better than what a crappy onboard soundcard can deliver.

I'm not pretending this is a highend DAC setup but anything is better than what I get from onboard sound from my computer.

Toslink input only, should support atleast up to 24/96, depending on the toslink input bandwidth and general quality.

Gerber top and bottom.

Yarpen · 18th March 2012, 02:39 PM

Quote:

Originally Posted by Neutrality

I made a little board with a WM8804 SPDIF receiver, ESS9023 DAC, volume pot, 3.3V regulators, onboard rectifier.

Needed something better than what a crappy onboard soundcard can deliver.

I'm not pretending this is a highend DAC setup but anything is better than what I get from onboard sound from my computer.

Toslink input only, should support atleast up to 24/96, depending on the toslink input bandwidth and general quality.

Gerber top and bottom.

Interesting ... Can you attach a schematic diagram?

Neutrality · 18th March 2012, 02:49 PM

Quote:

Originally Posted by Yarpen

Interesting ... Can you attach a schematic diagram?

Yarpen · 18th March 2012, 02:57 PM

THX !

Neutrality · 22nd March 2012, 05:58 PM

Did a small update of my DAC board.

Added a separate 50 MHz XO for the ES9023 DAC and a separate 3V3 regulator for the XO.

Removed the pot, since I'm not quite sure which kind I'll be using.

Neutrality · 22nd March 2012, 07:20 PM

Planning on ordering PCB's for my DAC board tonight.

Neutrality · 03:25 PM

Got my No-Thump boards yesterday and today I assembled a board and tested it. Came as no surprise that it worked, 10 Sec delay before the relay is on.

However, I made a little error. T1 is a BC557 transistor and for some reason I chose a TO-92 EBC transistor as my model. BC557 is usually CBE which meant I had to rotate it 180 degrees before my board worked. Took a liltte while before I realized it. But a few measurements and the problem was found.

Luckily it doesn't affect the No-thump board performance, only consequence is visual, with the transistor being turned 180 degrees compared to the silkscreen.

Compared to the schematic attached below there is a small change. R1 with a value of 1Meg only gives 2 Sec. turn on delay, what I used was a 5M1 resistor for the 10 Sec. delay metioned a few lines above.

Telstar · 7th April 2012, 01:03 PM

subscribed (and i want to say it

)

regal · 8th April 2012, 09:36 AM

I think a lateral mosfet headamp is long over due, especially for the classic headphones like AKG Sextettes that were designed around a mosfet output but they need more voltage than +-12V.

I was able to get my hands on a set of 2SK2013 / 2SJ313.

Can you share the simulation so I can work out the substitution and higher rails ?

7th April 2012, 01:03 PM	#79
Telstar diyAudio Member Join Date: Dec 2007 Location: Italy	subscribed (and i want to say it ) __________________ "The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938

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16th March 2012, 08:28 PM	#71
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	true, i run balanced all the way mostly (4 channels), the only amps i'm toying with 'balanced' input are the lateral fet 'wire' power amp and LPUHP, both of which showed improvements in distortion with balanced input. i havent built either up yet so we'll see

18th March 2012, 02:57 PM	#75
Yarpen diyAudio Member Join Date: Sep 2004 Location: Poland	THX !

22nd March 2012, 07:20 PM	#77
Neutrality diyAudio Member Join Date: Oct 2004 Location: Aalborg, Denmark	Planning on ordering PCB's for my DAC board tonight.

8th April 2012, 09:36 AM	#80
regal diyAudio Member Join Date: Jan 2004 Location: MD	I think a lateral mosfet headamp is long over due, especially for the classic headphones like AKG Sextettes that were designed around a mosfet output but they need more voltage than +-12V. I was able to get my hands on a set of 2SK2013 / 2SJ313. Can you share the simulation so I can work out the substitution and higher rails ?