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#1 |
diyAudio Member
Join Date: Oct 2003
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I purchased the Zen board a while ago, and finally got around to populating the board. Everything is original with the exception of a 4.7uF film cap across C6, a 10uF cap across C3, and a .22R 10 watt for R1. I eliminated C1 and C2, because my supply consists of 392KuF with 2.2 mH coils, unloaded it provides 53 volts (I'm using very large heatsinks, hopefully it wont blow up). Now, I remember Nelson suggests setting P1 to half the rail voltage, what two points do I measure from?
Thanks John |
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#2 |
The one and only
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From Ground to V+, or between the Source Pins of the two
Mosfets (close enough). |
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#3 |
diyAudio Member
Join Date: Oct 2003
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Thanks Nelson!! Still waiting on the FETs, pics soon to follow.
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#4 |
Banned
Join Date: Aug 2006
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umm i am new here what was there i wanted to ask
umm Nelson Pass is this the guy who is got articles published in magazines like audioxpress or is a fake you guys made up!umm cause it would be awesome you know chat with him about fusistors and stuff john |
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#5 |
diyAudio Member
Join Date: Dec 2005
Location: Sussex, UK
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Yes John he is the real Mr Pass.
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__________________
Martin ![]() ![]() ![]() ![]() |
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#6 | |
Formerly "jh6you". R.I.P.
Join Date: Jul 2006
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Quote:
a-man . . . enjoy the meal . . . |
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#7 |
Banned
Join Date: Aug 2006
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you know Zen is awesome!
umm what happens if i change the active load with a passive one, will it sound better, what type of fet is better for zen L-fet or V-fet? john |
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#8 |
Banned
Join Date: Aug 2006
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need help with zen attached
umm is feedback equal to r3/r1 or r3/r2 if it is r3/r1 r1 should be low value right? how low? is this a good zen? john |
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#9 | |
Formerly "jh6you". R.I.P.
Join Date: Jul 2006
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Quote:
It seems that all r1/2/3 are involved in the feedback . . . Gain approximately (r2xr3)/(r1x(r1+r2)) . . . ??? hmm . . . |
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#10 |
diyAudio Member
Join Date: Oct 2003
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fired up the zen, sounded great for a few minutes...The solder from the Drain of Q2 keeps melting off, and R1 gave up the ghost. Could this happen if Q3 is in backwards. Q2 blew on the left channel as well, but R1 is intact. It worked fine yesterday, the only change I made was to the power supply; I paralleled the two 2.2mH inductors, in the series config, they nearly melted.
R1 .22 10W Q1 IRFP140 Q2 IRFP9140 45V rails John |
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