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Old 22nd November 2009, 06:44 PM   #6031
EUVL is offline EUVL  Europe
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You haven't been watching ..............
Toshiba Dual JFET Heatsink

Patrick

PS the 50 we have on order have already been taken. If you want any, you need to let us know soon, so that we can get some more made.
We may even discuss trading them for 3886 boards. We must have bought 10 of those from you up to now.

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Old 22nd November 2009, 06:58 PM   #6032
tinitus is offline tinitus  Europe
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Is there any kind of risk involved with the coupling of alu/metal
In terms of capacitance, inductance or anything else
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Old 22nd November 2009, 07:05 PM   #6033
EUVL is offline EUVL  Europe
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No, because the JFET die (actual semiconductor) in a TO92 package is at least 2mm away from any external surface of the encapsulation. You can calculate for yourself how much capacitance you might get with 2mm of insulation (the black encapsulation epoxy of the TO92 case).




Patrick
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Old 22nd November 2009, 07:24 PM   #6034
EUVL is offline EUVL  Europe
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Brian,

You got mail (by PM).
Please send me your email address by PM.

Thanks,
Patrick
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Old 22nd November 2009, 08:02 PM   #6035
galop is offline galop  Slovenia
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F 5 is working thank you Mr.nelson for sharing your knowlege.First impression if i compare with phase linear 700b -warmer sound,lower bass,20 w is more than enough for normal listening.
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Old 23rd November 2009, 03:27 AM   #6036
a.wayne is offline a.wayne  United States
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Nice work , but i must ask , What is normal listening ?
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Old 23rd November 2009, 03:52 AM   #6037
CBRworm is offline CBRworm  United States
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I have found normal listening much louder than you would expect if you're speakers are relatively efficient.

In my setup it doesn't clip (on scope) until beyond the level of annoying the neighbors.
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Old 23rd November 2009, 05:54 AM   #6038
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Zen Mod View Post

instead of one IRF(P) pair - it's wise to use at least two pairs of laterals , because of xconductance ( lacking in laterals) .
Zenmod, sorry to quote you this late

I bought the laterals especially fore the F5 multiple output, to be easier to drive
Tho I bought quads, I later on thought I better set the limit to double pairs
Are you suggesting I should use my quads, rather than just double pairs
I know this is getting a bit worn out

Still, Im also slightly confused about the need for bias
Not the total bias, but the minimum bias needed on each single device
Which was partly why I decided to limit to double pairs
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Old 23rd November 2009, 08:23 AM   #6039
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by tinitus View Post
Zenmod, sorry to quote you this late

I bought the laterals especially fore the F5 multiple output, to be easier to drive
Tho I bought quads, I later on thought I better set the limit to double pairs
Are you suggesting I should use my quads, rather than just double pairs
I know this is getting a bit worn out

Still, Im also slightly confused about the need for bias
Not the total bias, but the minimum bias needed on each single device
Which was partly why I decided to limit to double pairs
laterals are pretty much good up from 100mA per device ;

stop thinkering too much - mount them all , crank bias as much your heatsinks and PSU can handle and enjoy .

later - if you think that you miss something - just parallel input jfets to add some juice ...... but that much later , when you have some good time with first iteration .

real spirit of laying Papapuzzle is to use brain and creativity , and learn ..... strictly acting by the book isn't most direct way for learning few things ....



use (for start) few amp fuses in rails , be careful not to make shorts , and you'll not loose any greenies in process .
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Old 23rd November 2009, 08:34 PM   #6040
alazira is offline alazira  United States
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Quote:
Originally Posted by Tea-Bag View Post
alazira, you going for less gain with the feedback resistors?
Hi Tea-Bag,
I am going to try the hitachi/renasis with the standard feedback resistor values first. It is my understanding that the 1ohm/100R/20R variation reduces feedback and increases the gain. I'll try that later. I only have enough resistors for one channel (thus the question about the sharing of resistors). By the way, do the mosfets need to be matched in this case since there will be four per channel?
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