livewire
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Posts posted by livewire
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They're beatin feet to necroposter's door as we speak!
The circuitry of this output amp has no stable operation and
I will probably comment on it later.
Could ya? Would ya?
Maybe it's because there's a bomb between the 2nd & 3rd stages?
Huh? Didja think of that?
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Happy Birthday Sir!
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OMFG! - That was intense. Ima gonna have BB DT withdrawals when it's all over...
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Oogly Boogly! Datz gonna B noice.
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Happy Birthday Sir!
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Now that's participatin!
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I used the washers that extend into the ceramic plate. I had to drill the holes on all TO220 packages. Part No. 7721-3PPSG.
Good! Them are the correct ones.
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The T2 does not have the same layout as the KGSSHV although much of the parts selection wisdom does apply here too.
(they are both HV stat amps released by KG around the same time)
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@ insanity - Since the conversation was IXYS "in general",
I was referring to the LED in my amp where IXYS was only an alternative in the third stage.
I just checked, this pcb revision is much different than my prototype.
Do what these guys say on the fourth stage.
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The resistor selection thing has been discussed before in this thread as well as the T2 thread.
No time to research all this again for you, so i'm speaking in general.
The Xicon though rated for 350 volts tend to work well,
although in one case somebody posted a pic of one that had shorted to the ground plane of the pcb.
If you have doubts, stand them off ~1/16" so the resistor body is not touching the pcb.
Again, if you have doubts 1/2 watt wont hurt. They fit and the brown Dale ones (CM60?) work well.
KG also employs the method you mention about stringing resistors in series to divide down
the voltage they see when a practical one component alternative is not available.
Looks like your pcb is already populated so all this is prolly moot.
One concern that I have is which plastic shoulder washers have you used on the heatsinks.
Please list the part number that you ordered / used.
They had better be the deeper ones or you'll be seeing fireworks when you power your amp on.
The correct plastic shoulder washers are a bit oversize and require drilling out the metal transistor tab
hole a few thousands of an inch (I used a dremel rasp) or pressing it in under pressure if you are lucky.
This too has been previously discussed in depth.
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You're welcome.
I don't know (you). Your board name implies it.
I hope for your sake that you have basic knowledge working with high voltage.
Your questions do not inspire confidence in those of us who have built these things.
Good luck!
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#1 - Your leds are crap, buy the right ones if you expect anything to function.
#2 - Correct.
#3 - Insane doc, make sure that you have a defibrillator on hand while working on the amp / psu while under power. You may need it.
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@KG - When are you gonna machine some of them demon core hand warmers?
(a more compact version of the original pictured here)
You can see he is warming his left hand with the device.
It had a fatal flaw though, he slipped with the screwdriver and the 14 pound plutonium orb that was inside went critical.
He was walking dead after that. The experiment was known as "tickling the tail of the dragon".
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Yup, must be a n00bish thang.
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happy Birthday!
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That would be the case if they put him in a box and buried him. Cheaper to incinerate the bastid.
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The Omegas on the BH easily trumped the 007. Just my worthless 2 centavos.
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Prolly a dumb question - does the case buy include the heatsinks?
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Are you gonna buy it?
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And not just any relay attenuator. That would be one of KG's recent gems.
Excellent design Kerry!
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http://youtu.be/O9BK3xcRH1g
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Make sure that no resistors are installed backwards. (I keed, I keed!)
Still one should check for things that may have been reversed, or wrong part in the wrong place.
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Happy Birthday Sir!
Megatron Electrostatic Headphone Amplifier
in Do It Yourself
Posted
Oooooh! Wanna see more!