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Old 10th November 2007, 12:15 PM   #121
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by EUVL
> even 27 can be fine ;

You probably have not been listening to Mr. Curl on the Blowtorch thread.

Whether the JFET will blow at 27V is one thing, whether it still operates properly is another.


Patrick

EUVL , gimme a break ;
if it works on 24 , it will work even on 27 ...... but you must always count on +10% in mains voltage . that is where is real danger , not in squible about tiny fraction of lesser performance;

if I must pay price as usual to collect knowledge in mentioned thread... that always leave bad taste in my mouth .

man can resort on L input filter if xformer in case is on high side , voltage wise .

or burn few volts in R part of CRC filter
whatever

if you wanna comment something - ask Papa why he isn't cascoded little critters
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Old 10th November 2007, 12:26 PM   #122
EUVL is offline EUVL  Europe
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> gimme a break ;

I gave you a hint.
Please feel free to decide whether to do anything with it.




Patrick
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Old 10th November 2007, 12:46 PM   #123
B.L. is offline B.L.  Poland
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My Aleph J - modified A5 PCB.
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Old 10th November 2007, 01:01 PM   #124
traw is offline traw  United States
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Repeat of question is post 127. Any notable difference taking the usual 'fine tune dc bias' adjust resistor (68k) after the two resistors to base rather than from in between the two resistors (1.5 & 3.32)?
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Old 10th November 2007, 05:19 PM   #125
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Quote:
Originally posted by B.L.
My Aleph J - modified A5 PCB.
Click the image to open in full size.

This type of horizontal layout is really nice.

One thought, could the distance between the 2 output sections of MOSFETs be increased to better take advantage of the heatsink? Having the actual dimensions of this board would be helpful to judge.

Having space for the 2 additional output MOSFETs is a nice option for higher biased version.

In both board designs above it's great to see the input and output sections on one board rather than 3.

Just my $.02 worth.

Nice work guys.

-David
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Old 10th November 2007, 06:50 PM   #126
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I must say that I'm not a big fan of running semiconductors at their rated limits, much less over.

Grey
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Old 10th November 2007, 07:03 PM   #127
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by GRollins
I must say that I'm not a big fan of running semiconductors at their rated limits, much less over.

Grey

me too .......... but that was not a question .........


that's same as using gas toob at max current .

looking in devils eye
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Old 10th November 2007, 07:17 PM   #128
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Wouldn't the additional mosfet's spread the load across more parts? I'd like to bias the amp to produce full power into 4 ohms rather than 8.

-David
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Old 10th November 2007, 08:30 PM   #129
B.L. is offline B.L.  Poland
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Isn't distance between output sections enough?
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Old 10th November 2007, 08:53 PM   #130
Ryssen is offline Ryssen  Sweden
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I have some pcbs for babelfish they are 22cm long and have C/C 5 cm between the fets.5 cm seems allright.
How long is your bord?
And where to find a schema for A5?
Hope you do some series making of those boards later..
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