| active system, first pictures - Click HERE for Original Thread |
| aaronboumans |
first pictures of my new active system
2x21w8555-01 with Aleph 5
12m4631g00 revelator with A3
d9505/990000 revelator with a3
A5(mono) contains two seperate toroids (300VA) for each voltage rail, two bridges, 2x47000uF, 2.2mh(0,47R), 2x47000uF+12x4700uF
A3(mono) contains 470VA, 2 bridges,2x47000uF, 2.2mH, 20x4700uF
A3(mono) contains 300VA, 2 bridges, 4x22000uF, 2.2mH, 20x4700uF
total uF (stereo) will be 244400+188000+182000=614400x2=1.228.800uF!! So special care should be taken with switching on. The caps will be loaded with large 100R and after 1 minute full power will kick in. (with a programmeble timerelais)
Here are the first pictures |
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| aaronboumans |
| picture show main parts of one monoblock |
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| Dennis Hui |
That looks serious!
What are you using for the active crossover?
Dennis |
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| Oil |
where did you source you chokes from?
Will be interesting to see the thermal management! - looks very nice work |
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| aaronboumans |
today installed 3 Thermistors (5Ohm ntc)+10 ohm resistor to repress inrush current. After 40 sec's they will be bridged.
So far so good! Then installed 1 Aleph 5 en that worked as well!
Old speaker; and there was sound!!!! yes!!!
And you can feeeeel real power and control, Je**s this is nice!
No hiss, buzz or anything! And dynamic range:bigeyes: !
I like it, will continue building and will send some new pictures soon.
By the way, how hot can/should the heat sinks be after 1 hour?
What can be tolerated? |
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| Badge |
| show us a copy of your electric bill after one month of operation. I think you could power a small city off that array.:D |
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| aaronboumans |
| It will not be extreme (max 1,2 KW stereo). Ans I will save a lot on gas:hot: |
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| boholm |
| quote: | Originally posted by aaronboumans
By the way, how hot can/should the heat sinks be after 1 hour?
What can be tolerated? |
I would say can you keep your hand on the heatsink without burning yourself, you're safe. Hotter than that and you may wear out your components. And running your electronics hot will decrease the performance of the components. |
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| aaronboumans |
| monoblock is ready, offset 5, 6, 24mV so ok! Current settings ok en temperature all less than 60 degr. C. Tommorow finishing touch (on/off-switch, blue led:cool: ) Pictures will follow shortly |
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| jacco vermeulen |
| quote: | Originally posted by aaronboumans
By the way, how hot can/should the heat sinks be after 1 hour?
What can be tolerated? |
Mr. Pass mentioned 55 C in one of his papers.
If the ambiemt temperature is only 20 C and the cooling elements 59 C they are probably a bit hot.
Every increase with 10 degrees means half of the life expectancy for the Mosfets, same story with electrolytic capacitors.
Evidence of that are a number of class A Mosfet amplifiers running very hot known to break down, eg : Musical Fidelity MA50 in the 80s.
But Hey : its better to burn up than to wither away !! |
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| Blues |
| the best thing about our habit...oh, I mean hobby is our diy equipment come with LIFETIME WARRANTY (PARTS AND LABOR):D |
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| aaronboumans |
| first 40kg's:cool: More to come:D |
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| altor |
| quote: | Originally posted by jacco vermeulen
Mr. Pass mentioned 55 C in one of his papers.
If the ambiemt temperature is only 20 C and the cooling elements 59 C they are probably a bit hot.
Every increase with 10 degrees means half of the life expectancy for the Mosfets, same story with electrolytic capacitors.
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About El.Caps - yes, about the mosfets - I'm not agree.
Have a very good experience, using mosfets at 100-110C with 70000-80000 hours lifetime.
Also the 40000-50000 lifetime for El.Caps - using 105C rated LongLife Caps with not more then 85C of their case temparature) |
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| AndrewT |
Hi Aaron, 3 heatsinks 1 black & 2 alloy. Have you managed to estimate if there is a loss of cooling for the alloy sinks compared to the black one?
regards Andrew T. |
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| EWorkshop1708 |
| Where did you get those nice cases to build your amps into? |
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| aaronboumans |
I bought them here in Holland. Nothing special, just a big 19" (5HE) standard case. Not very expansive 2x25€
http://www.etnshops.com/supermoduul/
This particular case is no longer available.:( |
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| aaronboumans |
Yes!!! they are finished!!
Had a lot of trouble with groundloops (after closing the case) because 4 toroids were used in one amp. Also had some mechanical hum because I placed a big copper plate on the 4 toroid-bolts, wrong!! The groundplate and two bolts and the copperplate work as one dead winding (on each toroid) so a lot of energy is used to heat up the bolt :hot: and move everything up and down (hummm:cool: )
But now there is perfect silence:xeye:
Measured 800 Watt total so no big issue on that one.
Total costs; around 950 euro
here is a picture |
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| jacco vermeulen |
Gefeliciteerd, Aaron.
They look like grand cat heaters, your pet will have a ball this winter.
For the obvious reasons i am very anxious for you to plug 'm in and give me(sorry, us) the verbal description. |
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| aaronboumans |
Dank je Jacco!
I thing a real good desciption of the complete set will take a while.
The active-filter/preamp is next and then the speakers themselfs.
Maybe I will test them on a friends passive high-end speakers this weekend although a very nice lady will keep me busy this sunday (sounds nice too doesn't it?:D pardon the pun :rolleyes: ) |
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| moe29 |
| dang... that cat needs to mix in a salad. :) |
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| aaronboumans |
| :att'n: Watch it! This cat is a lean&mean fightingmachine!:att'n: |
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| aaronboumans |
| tomorrow finaly an update.... |
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| aaronboumans |
| first setup; |
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| aaronboumans |
| first one ready; 90kg!!!! |
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| aaronboumans |
| gettin' there....(??) |
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| aaronboumans |
| maybe this thread can be moved to "loudspeakers"? |
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| aaronboumans |
here is the 6-channel (low/mid/high x2) volume control
12 steps, make before break ladder attenuator |
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| steenoe |
Thats a lot of decks, Aaronboumans:D Great work:) I see some Phillips resistors in there, I hope the rest are BC's? BC took over the Phillips production:D
Steen:cool: |
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| aaronboumans |
Thanks steenoe,
Yes I believe they are philips or vishay metal resistors? Dunno for shure , dunno if it is really significant? |
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