Help needed: Firing up the Aleph-X100 - Page 9

Blitz · 13th March 2004, 11:05 PM

Quick-Update: Mounted them back to back on a small heatsink, now I have a variation of 10mV around 0V DC. I guess that's good enough.

I have still quiet a variation between the power mosfets, but I understood from a comment Nelson made earlier in the forum that this should not be so important for the sound, only for the dissipation. So I gues I leave it the way it is and move on to the AC-Tests...

SineEra · 16th March 2004, 04:12 PM

Noticed you had a query on snubbers for your LC... PSU.

Have you used the different PSU's with your Aleph X CRC.. vs LCLC.. and if so what are the differences?

Am currently trying to decide on PSU to build 15V rail 8A bias 8 x O44 ( XA42).

TIA

Simon

Blitz · 16th March 2004, 05:17 PM

You must have a very low impedance speaker whenyou use this combination 15V/8A.

I have not experimented with PSUs, I want to build the ultimative Aleph-X (according to my subjective standards) and I made extremly good expereinces with choke-input-PSUs in the past, so why experiemnt with cheaper solutions ? As reported, I have only 30Mv ripple in the rail after a simple LC-filter and I could bring it further own if required, but I have right now only 0,2mV rillpe at the speaker-output, so why go further ?

Blitz · 21st March 2004, 06:52 PM

Short update: I am measuring an Ac current gain of 49 % with R12 = 1K, so I am wondering if the 1 % less than the optiomal 50% makes any difference and worth the hassle.

I made some measurements of the aquare wave response.

I have the + connected to the signal generator and the - connected to ground. No caps in the input. 10pf and 220k as feedback resistor. scope measures in diffenrential mode (adding both channels with one inverted) across the 6 ohm resistor at the output.

It looks pretty ugly though at the moment (see picture). Any ideas how to improve that ?

Blitz · 21st March 2004, 07:17 PM

Correction: 100k feedback resistor.

Input-resistors: 10k in series and to ground .

Blitz · 21st March 2004, 09:05 PM

OK, re-checked the whole equipment and found a problem of one output of the function generator - it gave 59V p-p into the Aleph-X...interesting that the Aleph-X was able to cope with that without going to hell...

...used now a different output with 3V p-p and now it looks not bad. Until which Voltage / Frequence did you get a perfect square-wave ?

Bksabath · 22nd September 2010, 10:09 PM

Was realy enjoin this where is the rest?

Briliant tread Blitz will certanly came andy when I get there

Tanks

16th March 2004, 04:12 PM	#82
SineEra diyAudio Member Join Date: Nov 2003 Location: Manchester. UK	PSU Noticed you had a query on snubbers for your LC... PSU. Have you used the different PSU's with your Aleph X CRC.. vs LCLC.. and if so what are the differences? Am currently trying to decide on PSU to build 15V rail 8A bias 8 x O44 ( XA42). TIA Simon

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13th March 2004, 11:05 PM	#81
Blitz diyAudio Member Join Date: Nov 2002 Location: Cologne, Germany	Quick-Update: Mounted them back to back on a small heatsink, now I have a variation of 10mV around 0V DC. I guess that's good enough. I have still quiet a variation between the power mosfets, but I understood from a comment Nelson made earlier in the forum that this should not be so important for the sound, only for the dissipation. So I gues I leave it the way it is and move on to the AC-Tests...

16th March 2004, 05:17 PM	#83
Blitz diyAudio Member Join Date: Nov 2002 Location: Cologne, Germany	You must have a very low impedance speaker whenyou use this combination 15V/8A. I have not experimented with PSUs, I want to build the ultimative Aleph-X (according to my subjective standards) and I made extremly good expereinces with choke-input-PSUs in the past, so why experiemnt with cheaper solutions ? As reported, I have only 30Mv ripple in the rail after a simple LC-filter and I could bring it further own if required, but I have right now only 0,2mV rillpe at the speaker-output, so why go further ?

21st March 2004, 07:17 PM	#85
Blitz diyAudio Member Join Date: Nov 2002 Location: Cologne, Germany	Correction: 100k feedback resistor. Input-resistors: 10k in series and to ground .

21st March 2004, 09:05 PM	#86
Blitz diyAudio Member Join Date: Nov 2002 Location: Cologne, Germany	OK, re-checked the whole equipment and found a problem of one output of the function generator - it gave 59V p-p into the Aleph-X...interesting that the Aleph-X was able to cope with that without going to hell... ...used now a different output with 3V p-p and now it looks not bad. Until which Voltage / Frequence did you get a perfect square-wave ?

22nd September 2010, 10:09 PM	#87
Bksabath diyAudio Member Join Date: Dec 2007	Was realy enjoin this where is the rest? Briliant tread Blitz will certanly came andy when I get there Tanks

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