bosoz rail voltages

EANDERS · 22nd March 2005, 06:58 AM

first post so bear with me please.
Just finished one psu board for xbosoz. The neg rail is at 60vdc.
The pos rail is at 53.7vdc?
pos drain is 95.5vdc, gate is 63.3vdc.
neg drain is 95.7vdc, gate is 63.5vdc.
checked the zener chains - ok, z115 is ok, c105 is ok.
replaced the irf610 mosfet on the pos side, still the same.
question, should the loss be greater thru the 610 vs the 9610?
or am i missing something obvious.
also note no difference loaded with 15k or open.
can i just add a proper value zener to the chain to obtain the voltage
i want?
Thanks, eanders

EANDERS · 25th March 2005, 06:53 AM

Uh, nevermind,
installed the 610 backwards inverting the source and gate.
now all is good.
the good news:
1 I laid out the point to point on paper correctly.
2 I got the drain in the right hole.

the bad news:
1 I can't follow my own drawing.

Humble Pie is a great rock group, that's my story and I'm sticking to it!
Thanks, eanders

Ren · 25th March 2005, 04:19 PM

You are sentenced to:

30 Days in the Hole

22nd March 2005, 06:58 AM	#1
EANDERS diyAudio Member Join Date: Feb 2005 Location: Northern California	bosoz rail voltages first post so bear with me please. Just finished one psu board for xbosoz. The neg rail is at 60vdc. The pos rail is at 53.7vdc? pos drain is 95.5vdc, gate is 63.3vdc. neg drain is 95.7vdc, gate is 63.5vdc. checked the zener chains - ok, z115 is ok, c105 is ok. replaced the irf610 mosfet on the pos side, still the same. question, should the loss be greater thru the 610 vs the 9610? or am i missing something obvious. also note no difference loaded with 15k or open. can i just add a proper value zener to the chain to obtain the voltage i want? Thanks, eanders

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25th March 2005, 06:53 AM	#2
EANDERS diyAudio Member Join Date: Feb 2005 Location: Northern California	Uh, nevermind, installed the 610 backwards inverting the source and gate. now all is good. the good news: 1 I laid out the point to point on paper correctly. 2 I got the drain in the right hole. the bad news: 1 I can't follow my own drawing. Humble Pie is a great rock group, that's my story and I'm sticking to it! Thanks, eanders

25th March 2005, 04:19 PM	#3
Ren diyAudio Member Join Date: Apr 2002 Location: Northern Virginia	You are sentenced to: 30 Days in the Hole

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