| kenny_(00)_ |
Hi everyone! This is my first post to diyAudio, and I know u all dread seeing another Aleph amp appear here, but I just wanted to share my joy with you guys! I can safely say I finished most of the amp except the wiring, haven't thought of how I should tweak it yet. Please feel free to criticize my wrongdoings! You can also see the description here and other projects I've done on my homepage....
homepage
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| MikeW |
Thats a nice looking amp. Very clean. I never get sick of pictures.
You will end up with more caps.;) :) |
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| Taco |
| Nice job! Why does every one in singapore have such nice cases :). |
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| moamps |
| quote: | Originally posted by kenny_(00)_
Hi everyone! This is my first post to diyAudio, and I know u all dread seeing another Aleph amp appear here, but I just wanted to share my joy with you guys! I can safely say I finished most of the amp except the wiring, haven't thought of how I should tweak it yet. Please feel free to criticize my wrongdoings! |
Hi,
nice work,
but I'm not sure that only 4x15000uF are enough for one channel Aleph2? :scratch:
Regards |
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| kenny_(00)_ |
Hi again, the caps were salvaged from another amp. Though I didn't plan it this way, there is enough space for another bank of caps if i need more. What do u guys think of cerafine caps 22,000uf@50v? I think I would prefer a more punchy sound like the X series, if everything else can be recycled, maybe a drop-in driver board to make an "XA100"?
Ha, but Singapore is one of the most difficult countries in the world to get a chassis made! The casing's design is actually pretty simple, but drilling/filing the holes is definitely not! And they are rather expensive too. I had bought the heatsinks surplus, then had them reanodised. Turns out this arrangement is good for easy modding:nod: The I/O power switch and powercon were last minute additions as i couldnt resist them! |
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| PedroPO |
Hi kenny!
can't see your web page:(
please post some pics here! or on www.passdiy.com |
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| kenny_(00)_ |
| Here's an image of the almost complete amp: |
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| PedroPO |
Ultra KEWL!
I love neat insides.
Lets see with the wiring
more pics please :D |
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| kenny_(00)_ |
| Hi all, i cant wait to get the wiring done too! When i do, i'll post them here first thing. But here's another pic showing the closeup of terminals: |
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| kenny_(00)_ |
| Here is the complete wiring for 1 channel. I have not tested it yet due to busy work, but will get to it asap! |
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| PedroPO |
nice work!
Is that a house fuse holder I see or a relay? |
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| kenny_(00)_ |
| That is a 10x38mm standard fuse holder. Since I replaced the powercon connector in place of the IEC socket with integrated fuse, I had no choice ;) The 2 thermistors are shown on the right of the fuse. All wiring I used is 16 AWG teflon silver plated wires. |
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| naldy |
Neatly done!
Is the thermal switch is connected to the main CB? |
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| kenny_(00)_ |
| Oh, I forgot to mention the thermal switch is mounted on the heatsink, to the left of the fuse holder (picture above). It is in series with Live mains line, together with fuse and thermister. |
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| kenny_(00)_ |
Hi dudes! Been a long time cause I was busy with work. But now I finally finished the Alephs! Before I go on, here are some measurements i took while testing:
Channel 1:
DC offset <1mV
temp rise ~30degs
ac current 0.9Arms@230v
PSU +/-46.5v (ref 230v)
PSU ripple 120mV
Channel 2:
DC offset <2mV
temp rise ~30degs
ac current 0.9Arms@230v
PSU +/-46.3v (ref 230v)
PSU ripple 110mV
Well, all seems fine except bias seems abit low, 200w instead of 300w. Checked all component values including R19 seems ok. Im quite happy with the offset, seems the mosfet matching pays off! If u guys detect any abnormal readings please inform me ok? I'll post pics once I get them loaded meanwhile gotta burn in the amps! |
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| li_gangyi |
| Yo~! All the projects at your site lack something...a schematic~! Does anyone carry a simple but clear schematic for this kinda amp?? I'm really interested to know more...thanks~! |
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| kenny_(00)_ |
| Schematics are located at www.passdiy.com ;) Well, as promised earlier here is a pic of the finished amps. I havent decided what to do with the front panel, didn't even install the LED yet. I was thinking something simple & cheap, maybe like some of the older Mark Levinsons..... |
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| kenny_(00)_ |
| Another pic showing my amps under test: |
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| JOE DIRT® |
nice work Kenny!!!
DIRT® |
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| mefinnis |
Looks very neat.
Coments are very minor only. I probably would have cut your heat sink in half and mounted the halves side-by-side so the fins were vertical. You could have split the 6-FET sets into 3's with minimal extra wiring and in this format the heat dissipation would have been more efficient.
Having said that, you may well have enough heat sink so this doesn't matter, but the rating of 0.2C/W would have referred to vertical poisitioning, I think.
What is the heat-sink temp after an hour idle ?
As stated above, you may well like to add some additional PS capacitance, or even better, make Pi filters by adding some chokes between the line caps - you have plenty of room in the case.
And more importantly than anything else ...... are you happy with the sound ??
cheers
mark :) |
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| kenny_(00)_ |
Hi guys, thanks for the support!
mefinnis:
In my quest for "saving" money, I bought the sinks as u see them and later had them anodised. The specs say 0.2C/w per sink, i believe this refers to vertical mounting. By touch the sinks seem to dissipate the heat quite evenly, and settle at ~55C i think sufficient. But I think my bias is still too low......
Well, my psu is not the best there is, I gotta improve it when my finances allow me to! That said, my front panel is not really ready yet, even the LED isn't installed. I've just started burning in the amps, didn't seriously listen to them yet. One thing I'm puzzled is the bass seems a bit lacking coming from those huge amps quite ironic isn't it? Well, keep u guys posted and three cheers to Nelson Pass who made this all possible;) |
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