Heatsinks for Bosoz?

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lgreen

lgreen

Member
Joined 2003
I'm building the PS and was confused as to why there are 3 9.1 V Zeners for the negative rail. I then spent a long time rereading everything and found this post by Kari-

Originally posted by Kari
And here's the pwr pcb.

BOM:
D1,D2,D3,D4,D5,D6,D7,D8: Choose whatever you think is best. There is room for ex. 1N4004 and also for TO220 diodes.
C1,C2,C3,C4,C5,C6,C7,C8: Snubber caps, rm 5mm, you can leave these out. Here you could use for ex. 100n caps.
C9,C10,C11,C12: 4700uF/100V snapin type, also here you can choose some other value, as this is snapin type almost any value can be used.
C13,C14: 0,1uF, rm10mm or 15mm pitch
C15,C16,C17,C18: 220uF/100V
C19,C20: 1uF, 15mm pitch
R1,R2: 27/2W
R3,R4: 1,5k
R5,R6: 221
Z1-Z7: 9.1V Zener
Z8-Z10: ~4,5V Zener (Choose so the total would be ~14V
Q1: IRF9610
Q2: IRF610
Click to expand...

So having Z8-Z10 as 4.5V zeners is different from the more current version at Kari's website ruffneck which lists Z1-Z10 as 9.1 V Zeners.

Which is it?
 
D

Dennis Hui

Member
Joined 2002
Paid Member
lgreen said:

So having Z8-Z10 as 4.5V zeners is different from the more current version at Kari's website ruffneck which lists Z1-Z10 as 9.1 V Zeners.

Which is it?
Click to expand...

Hi Lgreen,

I think 4.5 is the correct value for Z8-Z10. If I remember correctly,
the negative rail should be around -10 after regulation. This
requires the zener reference voltage to be about 14V (3x4.5 is
close enough)

Cheers,
Dennis
 
lgreen

lgreen

Member
Joined 2003
schematic?

Ok, let me look at the schematic of the PS....oh wait there isn't one. Guess I'll rip out the 3 9.1 V zeners I put in due to Kari's BOM and buy the parts at about $1 and pay the extra $10 shipping for 3 small components to install next week.

I've been part of a lot of GB's and this has so far been the absolute worst by far. This GB has been completely F'd up by the lack of schematics, failure of communcation and errors. Glad I got my boards after waiting for months because I never thought that they would actually arrive. Some of you are still waiting so I consider myself lucky, actually.

But i'm still a little upset by the lack of status updates and lack of design info. I'll go quietly now, sorry for the outburst. I do appreciate the boards and the help of many of you in this thread. A little frustrated that's all.
 
P

promitheus

Member
Joined 2001
I was looking at the power supply and wanted to ask a few questions.
Since the voltages are not symmetrical wouldnt it be a good idea to use lower voltage caps on the negative side at a higher capacitance?

whats the point of using 100V caps on the negative side when we can use something at alower voltage?
 
Kari

Kari

Member
Joined 2004
ruffneck.net
Re: schematic?

lgreen said:
Ok, let me look at the schematic of the PS....oh wait there isn't one. Guess I'll rip out the 3 9.1 V zeners I put in due to Kari's BOM and buy the parts at about $1 and pay the extra $10 shipping for 3 small components to install next week.

I've been part of a lot of GB's and this has so far been the absolute worst by far. This GB has been completely F'd up by the lack of schematics, failure of communcation and errors. Glad I got my boards after waiting for months because I never thought that they would actually arrive. Some of you are still waiting so I consider myself lucky, actually.

But i'm still a little upset by the lack of status updates and lack of design info. I'll go quietly now, sorry for the outburst. I do appreciate the boards and the help of many of you in this thread. A little frustrated that's all.
Click to expand...

:mad: :mad: :mad: :mad: :mad:
Ok, have ever organized a gp?

promitheus said:
I was looking at the power supply and wanted to ask a few questions.
Since the voltages are not symmetrical wouldnt it be a good idea to use lower voltage caps on the negative side at a higher capacitance?

whats the point of using 100V caps on the negative side when we can use something at alower voltage?
Click to expand...

Sure you can use lower voltages, that's why the caps are snap-in type. I used the same footprint because of "symmetry" of the board.
 
A

audio_cf

Member
Joined 2001
I am sorry if people in this thread think I am naging but I want to know what is the status of the parts GB!
It is over 2 weeks since the organizer posted in this thread. I just want to know how the assembly went if Coloumb has made any listening tests and when we can expect delivery of the parts!

Best regards /// Carl-Fredrik
 
A

audio_cf

Member
Joined 2001
Coulomb said:
Boy, take a little break for personal reasons and the doom and gloomers come out of the woodwork!:bigeyes: :bigeyes:

Here is a link to view the parts kits assembled on a pair of Kari's boards as well as some notes on construction. I will start preparing kits for shipping this coming week. I will get a few parcels wieghed at the Post Office and start sending out shipping invoices the week after next.


Regards

Anthony

http://www.briangt.com/gallery/album12
Click to expand...



I dont think he is waiting for the boards!

/// Carl-Fredrik
 
lgreen

lgreen

Member
Joined 2003
PS question

Power supply question, i've built them up and tested.

I replaced the 3 9.1V zeners on the negative supply with 3 zeners rated for 4.3V (500mA). Turning this on I get only about -7.5V, this doesn't seem right.

Measuring across the string of 3 zeners, its about 10.5 Volts, and I have -14VDC at the output of the R in the CRC filter. I'm using a load of 3.5K on the output.

For the positive rail I get 60VDC out of the regulator instead of 64V, i've got 93VDC going into the regulator with R in the CRC at 56 ohms.

comments/help?
 
metalman

metalman

Member
Joined 2003
-7.5 is starting to get a little on the shy side, but should still work fine, as it leaves about 4.5V across the CCS resistor that sets the bias current. Worst case is that you might have to adjust the value of the CCS resistor to get the optimal bias current, but that is easy-peasy stuff.

Cheer, Terry
 
metalman

metalman

Member
Joined 2003
Originally posted by lgreen
a current value you think is pretty good?
Click to expand...

The optimal value will depend on the value of the positive rail and R1/6 and R2/7. You want R1/6 and R2/7 to have about half the positive rail voltage across them. 40-50mA on each half of the balanced circuit should work nicely, making the CCS current in the 80-100 mA range.

Cheers, Terry
 
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