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Old 13th September 2005, 02:37 AM   #31
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Typical customer . . . ?

I think that anyone could be his true customer. It's largely possible.

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jH
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Old 13th September 2005, 07:24 AM   #32
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Magura, Circlomanen and Nelson Pass

Thanks for the heads up on the MOSFET alternatives.

I have IRFP450, IRFPG40 and IRFPG50 at hand and it looks like the IRFP450 may be just OK.
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Old 13th September 2005, 08:09 AM   #33
EUVL is offline EUVL  Europe
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Default Xed Version ?

I wonder whether an Xed version is still possible with 2 stages ?

I have had an X-ed, 3-stage, JLH using MOSFETS (IRF610s and IRFP044s), with a less elegant way of biasing the 2nd stage, and it sounds great. Split rails, no coupling caps.

Couldn't think of how to do it in 2 stages ..........



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Old 13th September 2005, 10:10 AM   #34
Magura is offline Magura  Denmark
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Take a look at the Zen V7, single stage X, or the AX, which is a 2 stage X .



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Old 13th September 2005, 10:28 AM   #35
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Hi, JH,

I've worked on the first question on my homework
I cut the heatsink, so it will be mounted vertically. From my experience, the same heatsink if placed vertically does more effective heat sinking than if it is placed horisontally.

All the pieces are bolted together to thick L extrusion, with many bolts (my hands are tired bolting all of them tightly )

Between L extrusion and heatsink pieces, I put white heatsink compound, so the heat transfer from L extrusion to the heatsink will be maximal. The transistors will be mounted on the L extrusion.
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Old 13th September 2005, 10:41 AM   #36
EUVL is offline EUVL  Europe
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This was how I did it first, nothing to write home about :

http://www.diyaudio.com/forums/showt...045#post507045

This is how it is today (see attachment).

Please give me some specific ideas how to get rid of the JFET and combine the phase splitter into the long tail pair.


Patrick

(PS I think I understand the AX circuit pretty well.)
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File Type: pdf jlh-x mosfet.pdf (42.4 KB, 1030 views)
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Old 13th September 2005, 02:16 PM   #37
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Hi Lumanauw,

Looks very good.
Ya . . . okay, you finish your homework first. Then, do my homework for me. But, make mine horizontal. Otherwise, he will find out.

O . . . yeah . . . and, if you make PCB, leave one for me.

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jH
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Old 13th September 2005, 03:06 PM   #38
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Hi, JH,

Since this is "THE" homework, I planned not to use any PCB at all . They will add parasitic track capacitance, confusing signal accepted by each component. I also planning to isolate the whole transformer (a second casing, maybe?)

I will make it wire-to-wire connection between component legs, trying something like JonathanCarr (Lyra) saying about "air dielectric". He used to monitor very small vibration (making phono pick up) and monitoring very high frequency disturbance (Mhz region), and he uses this technique. I must try it
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Old 13th September 2005, 03:25 PM   #39
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Hi Lumanauw,

Ya . . . good decision.
Don't want to see this thread being covered by PCB group buying.
Ya . . . my F1 is also of p2p.
Ya . . . carr is a good vibration source.
Ya . . . you will hear MHz music.

All the best!
I will watch. The teacher will watch.

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jH
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Old 13th September 2005, 03:40 PM   #40
Kari is offline Kari  Sweden
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Quote:
Originally posted by jh6you
Don't want to see this thread being covered by PCB group buying.
ok

/Kari
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