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Modifying the Bride of Zen.
Modifying the Bride of Zen.
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Old 16th February 2001, 09:27 AM   #11
Hoffmeyer is offline Hoffmeyer  Denmark
diyAudio Member
Join Date: Dec 2000
Location: Knabstrup, Holbaek
I`m using Orcad`s PSpice 9.1.
It`s the best I`ve come across so far.
You can get a Lite version of ver. 9.2 from http://www.orcad.com .
Hoffmeyer ;0)
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Old 16th February 2001, 04:34 PM   #12
pixie is offline pixie
diyAudio Member
Join Date: Oct 2000
Location: Austin, Texas, USA
I looked at the A40. It looks like it uses two Full-wave bridge rectifiers to get +-V for two channels. So, you're telling me to use the -V as ground for my Bride? Then the ground for the Bride is not equal to earth ground? I only want one channel remember. This doesn't make sense.

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Old 27th November 2001, 03:07 AM   #13
mg16 is offline mg16
diyAudio Member
Join Date: Nov 2001
Location: western pa
Default Pixie.. Chuck your transformer..it won't work

30 volts with the sec. in series will give you about 42 volts total. The Mosfet draws 40 ma. The drain resistor is 1000 ohms. You will lose all 40 volts across the drain resistor. You need at least 20 volts across the mosfet. If you bias down to 20 ma., that would leave you 20 volts of swing, or + - 10 volts output voltage swing. I am not even sure if 20 ma. is enough to bias the mosfet "on". I would save your transformer for another project, and buy a 30+30 at 3 amps or more transformer. That is about the only change I made to the stock version, and it sounds fantastic. Its worth building it as Pass intended, but with more current capability in the supply.
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Old 27th November 2001, 03:42 AM   #14
paulb is offline paulb  Canada
diyAudio Member
Join Date: Jun 2001
Location: Calgary
Default Voltage doubler will work

There's no reason why a voltage doubler won't work. It was the A75, not the A40, that used it.
See http://www.passlabs.com/projects/a75_2_4.htm
and the following section for a description of voltage doublers.
Note the doubler is a half-wave rectifier, so you should probably double the filter cap sizes.
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