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Old 8th June 2013, 10:54 AM   #131
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after reading the post, Just to make sure I got this right on adjustments.

Step one: To set Quiceint to 370 MA, I use P1 to measure across 0.1 source resistors and adjust for 40 ma or 37 ma on both resistors. (p18 and p17)

Step two: to set the voltage across the bootstrap resistor R12 to 24-26 volts (P3) I simply measure both sides of the resistor and should get 24 volts.

Step three: Then offset which measure simply between speaker terminals plus and ground and should be plus or minus 10 m. short imput to ground for this.

There was something about "Adjusting r12 to set T3 vds at approximately 8 volts" in the thread which I do not quite understand. it it correct to understand thatn when r12 when it is adjusted in step two ato give 24/26 voltes, this should give about 8 volts to T3 and I measure between the Drain and source of t3. if not, does this mean I may have to change R12 to a different value if I do not get 8 volts to T3?

all is soldered on pcbs except transisitors and am awaiting on diode which supplier did not send in original package to put everything together and adjust.

Many thanks if someone could reconfirm this is the correct way to adjust.

thanks, John
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Old 9th June 2013, 07:55 AM   #132
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John,this isn't clear for me too.Didn't check this myself maybe do it someday to know.
John,do you already have FetZilla boards?
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Old 9th June 2013, 02:58 PM   #133
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THANKS MM. I HAVE THE BOARDS FROM A MEMBER WHOM WANTED TO SELL HIS, I STILL WANT THE ONES FROM THE GROUP BUY THOUGH WHICH YOU DID. JUST MISSING A DIODE TO PUT IN AND HOOK UP TOGETHER.

I THINK YOURS WORKED WITHOUT THE t3 VDS AT 8 VOLTS SO i WILL TRY THE THREE ADJUSTMENTS AS WRITTEN IN THE BUILD GUIDE AND SEE WHAT I GET. BEST, JOHN
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Old 12th June 2013, 08:54 PM   #134
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Caps lock
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Old 15th June 2013, 01:14 PM   #135
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Does anyone knows the damping factor of this amp?
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Old 15th June 2013, 03:53 PM   #136
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Attention Fetzilla builders.
I have just listed 2 pairs of transformers that are ideal for Fetzilla's. One pair is Avel Y236504 that were used in Aksa's for a long time. And the other pair is Triad 160VA 2x24V that I used in my own Fetzilla, when I had it operating.

FS: Avel Y23604 160VA 2x25V

FS: Triad Magnetics 160VA 2x24V Toroids
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Old 16th June 2013, 12:36 AM   #137
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Thanks Steve, useful information for trafo buyers in US.......

MM,

Never measured, but I would assume a Zout around 0.3R, giving a DF around 26 with 8R speakers. BTW, this is not very useful for audio amps, it's a curiousity only, although I've found that a high DF means a lot of global feedback which leads to poor decay when playing notes, rather like playing a piano without using the sustain pedal.

Most people don't enjoy music like this; they prefer notes merging with the next, for some reason it gives a more satisfying midrange and bass sound.

I try to get DF less than 40.

Cheers,

Hugh
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Old 16th June 2013, 08:17 AM   #138
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As I can say for certainty is that the FetZilla has very controled bass.The FetZilla doesn't need high DF.As I'm no electronic engineer I've to believe what other people say but I've my personal experience.If you hear the Fetzilla I would think ,no I don't need high DF.The easiest way to get controled bass is a high DF but it influence sound right?
But when you've a well tought design you can have a rock steady and controled amp with less DF.The fetZilla is prove of this.Just my 2 cents!
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Old 2nd August 2013, 04:37 PM   #139
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Troubles,put together my brothers fetZilla and the trouble has started.The first 0,1R between the psu caps on the positive side began to smoke.I couln't measure(across R17-18) the other channel it shows nothing on my multimeter not even over R12.
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Old 3rd August 2013, 12:18 AM   #140
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Quote:
Originally Posted by meanman1964 View Post
Troubles,put together my brothers fetZilla and the trouble has started.The first 0,1R between the psu caps on the positive side began to smoke.I couln't measure(across R17-18) the other channel it shows nothing on my multimeter not even over R12.
Sounds like a short - have you tried the dim lightbulb tester?
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