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Old 28th May 2008, 08:09 AM   #911
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Default Hi!

What you mean, ISO or UTS?

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Old 28th May 2008, 08:17 AM   #912
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Who cares.

Metric : M3
UTS : 6-32
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Old 28th May 2008, 08:19 AM   #913
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I don't know which Standard is in Manila.

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Old 28th May 2008, 08:22 AM   #914
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thanks jacco !
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Old 28th May 2008, 10:30 AM   #915
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Quote:
Originally posted by jacco vermeulen
Who cares.

Metric : M3
UTS : 6-32
If you use the Fairchild devices a 6-32 screw is too big for the hole. I had to drill mine out (with no ill effects to the MOSFET).
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Old 28th May 2008, 10:54 AM   #916
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Default re; pcb

Goffe,
I see you have been busy with the changes and thinned up the pcb - assume those measurements say 3.9" x 1.5" which makes the fet mounting holes about 6" apart - to suit long heatsink - could easily move them around to the long side to suit shorter sink.
Variac suggested the moving the th1,2 closer to the power fet which seems a good idea and the pads plus resistor for that nice blue led is easily done.

Now, if you exchanged the positions of R19 with R21 (20 - 22), could then run the fat O/P track under R17 (14) and goirectly to the fet pad - saves going around the corner - bit simpler

If you were to move the H1 (2) closer to the o/p fets, suggest moving the R3 and R15 (TH2, R4, R16) with it and so can move the V+,V- towards "front" of pcb, use some resistors as per Variac for track-jumpers for the led pads (connector?)

Hope this is of assistance ... J
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Old 28th May 2008, 11:02 AM   #917
FaTTy is offline FaTTy  Russian Federation
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Can anyone compare sonic quality of F5 with JLH?
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Old 28th May 2008, 01:03 PM   #918
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Default Re: re; pcb

Quote:
Originally posted by jameshillj
Goffe,
I see you have been busy with the changes and thinned up the pcb - assume those measurements say 3.9" x 1.5" which makes the fet mounting holes about 6" apart - to suit long heatsink - could easily move them around to the long side to suit shorter sink.
Variac suggested the moving the th1,2 closer to the power fet which seems a good idea and the pads plus resistor for that nice blue led is easily done.

Now, if you exchanged the positions of R19 with R21 (20 - 22), could then run the fat O/P track under R17 (14) and goirectly to the fet pad - saves going around the corner - bit simpler

If you were to move the H1 (2) closer to the o/p fets, suggest moving the R3 and R15 (TH2, R4, R16) with it and so can move the V+,V- towards "front" of pcb, use some resistors as per Variac for track-jumpers for the led pads (connector?)

Hope this is of assistance ... J
You actually need a lower impedance ground path. R1 and R2 (10 ohms) pass a bit of current through R5..8 which are in parallel with the load (assume 8R).

It's always important to have the distance from the gate stopper to gate as short as possible.

I wouldn't get so hung up about having the JFET's as symmetrical as Goffe has shown. It will make things a bit simpler if the JFETs and Zetex devices are in a "kind of X' format.

When I get back from NYC this afternoon I am going to try various values for the JFET gate stopper. I think that the 1K may be a bit high.
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Old 28th May 2008, 03:24 PM   #919
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Hi Fatty,

The only way to find out is to build these two amps and compare/judge them to your listening comfort.
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Old 28th May 2008, 03:32 PM   #920
miguel2 is offline miguel2  Portugal
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Case

What are the external dimensions of the F5? I didn't find these at the site.
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