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Old 1st July 2004, 08:45 PM   #1
diyAudio Member
Join Date: Jun 2004
Location: Angered, Sweden
Default bigger transformer in BOZ

Im a newbie at this forum and this is my first question:

I am building a BOZ with the PASS PCB.
I have got a 2X33V transformer leftover from another project.
What changes shall i make to use it in the BOZ?

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Old 2nd July 2004, 12:03 PM   #2
joensd is offline joensd  Germany
diyAudio Member
Join Date: Dec 2001
Location: Germany
As your rails will be a bit higher than in the article the power dissipation of Q1 will also be slightly bigger.
Cause the voltage might be near 95V you have to watch C1 and it´s voltage rating but that should still be OK.

You can also get the rails down a bit by putting a resistor in line with the +-terminal of the rectifier (after C1). A value of 50-100Ohm and a 2W rating should be OK.
It´ll get the rails down about 4-8V (50-100Ohm).
If you now put another cap after your added resistor you´ll have some additional RC-filtering which should be very fine.
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Old 2nd July 2004, 06:29 PM   #3
diyAudio Member
Join Date: Jun 2004
Location: Angered, Sweden
Thanx a lot
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