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Old 2nd November 2010, 10:31 AM   #1101
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by ivodonchev View Post
for 50vac transformer 80v capacitors is fine with sure
show us the arithmetic to back up "is fine with sure".

a 5% regulation 230:50+50Vac transformer run from maximum tolerance UK mains supply will give ~+-81.5Vdc after the bridge rectifier.

DC = Vsupply / Vratedprim * Vratedsec * (1+regulation) *sqrt(2) -0.5 ~
254/230*50*1.05*1.414 - 0.5 = 81.48Vdc
6% regulation gives 82.26Vdc, 4% regulation gives 80.7Vdc.

Then each builder can check their own voltages before they buy the wrong components.
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Old 2nd November 2010, 10:39 AM   #1102
alex mm is offline alex mm  Romania
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Default MOS FET terminal....

..... I think it's ok with terminal assigment look at the picture below .
Source resistors are on bottom side optional .
Alex.
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Old 2nd November 2010, 10:58 AM   #1103
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Nice work Alex
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Old 2nd November 2010, 11:20 AM   #1104
ihgl is offline ihgl  Sweden
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Quote:
Originally Posted by alex mm View Post
..... I think it's ok with terminal assigment look at the picture below .
Source resistors are on bottom side optional .
Alex.
Alex. Maybe I am completely wrong. But are you shure drain and gate should not be the other way round? But off course my memory could be mistaken. It was some 15 years since I dealed with these (SJ 50, SK135)
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Old 2nd November 2010, 11:38 AM   #1105
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I have been playing with every variant of this goldmund all the way up to the "enhanced version".. and with this one .... my ??? is .... where is the bias adjustment ?? Maybe some magical autobias circuit??

With different model laterals (hitachi , exicon , renesis) the circuit had to be adjusted to define my 100mA Xover point , why not "allow this" on a clone ??
OS
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Old 2nd November 2010, 11:45 AM   #1106
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Please take a look at the attach spec for ECF10N20. Alex is right with the pcb.

Alex, do you think you can send me the Sprint file? Tks.

Please don't keep asking about the source resistor. Post 1067 has shown how we can implement them even w/o changing the pcb. Alex had even changed it to show everything. But Alex, we still have to insulated the top screw as I had shown in Post 1067 right? My photo was a bit different from alex's drawing because I had a different orientation of the TO-3 (that was my super leach 8xTO-3), but the idea stands. Everybody is happy with the source resistor now?
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Old 2nd November 2010, 11:54 AM   #1107
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forget to attach. here it is again.
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File Type: pdf ecf10n20-p1f.pdf (180.3 KB, 381 views)
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Old 2nd November 2010, 12:06 PM   #1108
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Quote:
Originally Posted by ostripper View Post
I have been playing with every variant of this goldmund all the way up to the "enhanced version".. and with this one .... my ??? is .... where is the bias adjustment ?? Maybe some magical autobias circuit??

With different model laterals (hitachi , exicon , renesis) the circuit had to be adjusted to define my 100mA Xover point , why not "allow this" on a clone ??
OS
It either shows a total lack of understanding of how to build a amp or a total lack of consideration for other people planning on building this thing, who may not be that experienced.
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Old 2nd November 2010, 12:10 PM   #1109
ihgl is offline ihgl  Sweden
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Originally Posted by bigpanda View Post
forget to attach. here it is again.
On the data sheet it is viewed from the under side. Alex drawing seems to be seen from above. Maybe I am still wrong. But it does not look right to me. Sorry for bothering and maybe my brain is confused today...

On my old PCB it looked like this anyway seen from above:
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Old 2nd November 2010, 12:25 PM   #1110
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Try to do it this way :
The line between G & D and the line between the 2 mounting screws makes a cross (not a +), the G is on the left when looking from top. Your drawing is right and so is alex's. the orientation of your drawing is confusing you. If you rotate your drawing to make the cross upright and do the same with alex, (angle of rotation is different for the 2 cases) you will see they are the same.
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