Member
Joined 2002
Peter May i ask what heat sinks you are going to use and to maybe post the picture of it and with the board mounted to it. Id like to see what size heat sink you use to disapate all the heat.
J'
P.s Board's Look Great.
J'
P.s Board's Look Great.
WorkingAtHome said:
It is 3.35 x 4.1"
For testing I will probably use R-Theta heatsinks (from a group buy). They are 11 x 11" with 23 fins, 2" long.
I'm thinking about something like this...
It's a 1/4" copper plate. I will cut it to maybe an inch longer then the board, run 1/2" copper pipe on either end, and water cool the amp. More here:
http://www.diyaudio.com/forums/showthread.php?postid=598733#post598733
It's a 1/4" copper plate. I will cut it to maybe an inch longer then the board, run 1/2" copper pipe on either end, and water cool the amp. More here:
http://www.diyaudio.com/forums/showthread.php?postid=598733#post598733
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Hi Peter !
I've just finished a BrianGT 3875kit, my first DIY experience !
I must say i discovered a new world !!!
Since then, i spend most of my spare time reading and learning from this forum...
I'm really impressed by the design of your mini Aleph 30 and i think it would be a good way to introduce myself to Class A and PassLabs.
But i have a few questions :
1. I might use this enclosure http://www.hifi2000.it/default.asp?id=15&mnu=15
But i'm not sure it will dissipate enough.
If so, can i remove 2 output devices per channel, so i get a 10W mini Aleph A ?
Is it correct ?
2. It's hard to find all the components, especially when you don't really understand what you need,plus prices are much cheaper in US than in France...
If i go for the Aleph30 Component set wiki GB, can i populate your boards ?
3. No psu pcb as mentionned earlier, but do you plan a GB for the components, especially these IXYS ?
Or is it easier for me to order the briangt PS component GB ?
4. Which transfo do you recommend for a stereo mini Aleph 30?
5. I have no preamp ! Is it possible to do like with my gc, add a rotary switch for the sources and a pot for the volume ?
Or is it an "heresy" ???
Thanks.
I've just finished a BrianGT 3875kit, my first DIY experience !
I must say i discovered a new world !!!
Since then, i spend most of my spare time reading and learning from this forum...
I'm really impressed by the design of your mini Aleph 30 and i think it would be a good way to introduce myself to Class A and PassLabs.
But i have a few questions :
1. I might use this enclosure http://www.hifi2000.it/default.asp?id=15&mnu=15
But i'm not sure it will dissipate enough.
If so, can i remove 2 output devices per channel, so i get a 10W mini Aleph A ?
Is it correct ?
2. It's hard to find all the components, especially when you don't really understand what you need,plus prices are much cheaper in US than in France...
If i go for the Aleph30 Component set wiki GB, can i populate your boards ?
3. No psu pcb as mentionned earlier, but do you plan a GB for the components, especially these IXYS ?
Or is it easier for me to order the briangt PS component GB ?
4. Which transfo do you recommend for a stereo mini Aleph 30?
5. I have no preamp ! Is it possible to do like with my gc, add a rotary switch for the sources and a pot for the volume ?
Or is it an "heresy" ???
Thanks.
Member
Joined 2002
jackmoai said:
Peter please email me about this i could arrange a group buy for your parts or sell kit's if needed. I don't want to barge in here if you are just offering a hand to any one.
J
I can't imagine that somebody who is looking for Aleph parts, could have missed Aleph Mini thread. So everybody thus far should know that Jason is taking care of the parts and let it leave it like that.
This thread is only about Aleph 30 PCB and I don't want it to be associated with any group buy. Why? Because, IMO, group buys lost it's true meaning long time ago. Even as a moderator, I was always against the too relaxed attitude with respect to anything called group buy.
If you have something interesting, present it on a forum. If it's worth attention, people will go for it, without a need to create long list of prospective buyers. Just make your e-mail available.
I'm not hiding that I still manage to do some profit on this board offer. At the end of a day, I will look how much it took out of my time, and how much the forum deserved to share the cash flow. I will do my contribution, but obviously this was not a group buy. That's why I don't call it as such. 😉
This thread is only about Aleph 30 PCB and I don't want it to be associated with any group buy. Why? Because, IMO, group buys lost it's true meaning long time ago. Even as a moderator, I was always against the too relaxed attitude with respect to anything called group buy.
If you have something interesting, present it on a forum. If it's worth attention, people will go for it, without a need to create long list of prospective buyers. Just make your e-mail available.
I'm not hiding that I still manage to do some profit on this board offer. At the end of a day, I will look how much it took out of my time, and how much the forum deserved to share the cash flow. I will do my contribution, but obviously this was not a group buy. That's why I don't call it as such. 😉
Now back to the questions at hand:
1. This enclosure might work, or might not. You won't know until you try it. You can always lower PS voltage and reduce number of devices.
2. I answered that question already. No group buys here, contact jleaman directly. 😉
3 A GB for IXYS bridges would benefit everybody, especially when sorting is pretty easy and no multiple parts to count. But I'm not sure if enough interest could be generated.
4. I can't recommend anything for Aleph 30. I've been away for too long. Maybe 500VA (for 2 channels) , but couldn't be too sure about it.
5. You can do that, and if you manage to get enough gain it should work fine.
jackmoai said:
1. This enclosure might work, or might not. You won't know until you try it. You can always lower PS voltage and reduce number of devices.
2. I answered that question already. No group buys here, contact jleaman directly. 😉
3 A GB for IXYS bridges would benefit everybody, especially when sorting is pretty easy and no multiple parts to count. But I'm not sure if enough interest could be generated.
4. I can't recommend anything for Aleph 30. I've been away for too long. Maybe 500VA (for 2 channels) , but couldn't be too sure about it.
5. You can do that, and if you manage to get enough gain it should work fine.
hifi 2000
Hi guys.
Hope this helps, because i know the hifi 2000 stuff.
This is my impression, having used for various projects these cases, that IMHO are not wonderful because they tend to bend under heavy weights such that of big trafos needed for aleph 30 and similar.
The so called "pesante dissipante" case of the firm hifi2000 I think will fit an aleph 30 only on the 4units depth 400mm version. This is something that i tell after a rough evaluation of the thermal resistance of the dissipating fins. These are just 4 cm depth. Moreover i can remember that somebody (don't remember who actually) here in the forum has used for his aleph 60 mono such case, with acceptable results in terms of dissipation an temperature.
As a terrible drawback for such cases, I would mention that the base bottom and the covering are made of a very thin 1mm steel, very prone to ringing anytime when trafos are less than perfects in terms of vibrations.
I would rather go with custom aluminium cases.
It's much more work to do , but there is no comparison between a good custom case and the hifi2000 ones.
Ciao
Paolo
Hi guys.
Hope this helps, because i know the hifi 2000 stuff.
This is my impression, having used for various projects these cases, that IMHO are not wonderful because they tend to bend under heavy weights such that of big trafos needed for aleph 30 and similar.
The so called "pesante dissipante" case of the firm hifi2000 I think will fit an aleph 30 only on the 4units depth 400mm version. This is something that i tell after a rough evaluation of the thermal resistance of the dissipating fins. These are just 4 cm depth. Moreover i can remember that somebody (don't remember who actually) here in the forum has used for his aleph 60 mono such case, with acceptable results in terms of dissipation an temperature.
As a terrible drawback for such cases, I would mention that the base bottom and the covering are made of a very thin 1mm steel, very prone to ringing anytime when trafos are less than perfects in terms of vibrations.
I would rather go with custom aluminium cases.
It's much more work to do , but there is no comparison between a good custom case and the hifi2000 ones.
Ciao
Paolo
Thanks for your answer, it is more clear now but :
1. Thanks Pamaz for sharing your experience with this case, but what do you think of replacing the top and bottom parts with 5mm aluminium ?
It would be still cheaper than buying 2 heatsinks (Conrad Australia) and building a case ...
2. Actually, i was talking about the compatibility of your PCB with components of jleaman GB.
You mentionned earlier that you used irfp140 for output devices, and jleaman GB uses irfp044 and irf9610 !...
Do they fit ???? And what about the sound difference with the originals irf244 ?
3. I understand that you also have to sort these IXYS each other ????
What about using MUR860 on GC supply board ?
4. 500VA 2*25V is ok ?
5. My plans are making a kind of integrated amp ...
Basically, the PCB are really small, but we still need BIG heatsinks, so a big enclosure too...
That means that there will be enough room to put a preamp in the same box, like a Bosoz !!!
Just a rotary switch and a pot if not enough room.
What do you think of that ?
Thanks again .
Code:
1. This enclosure might work, or might not. You won't know until you try it. You can always lower PS voltage and reduce number of devices.
2. I answered that question already. No group buys here, contact jleaman directly.
3 A GB for IXYS bridges would benefit everybody, especially when sorting is pretty easy and no multiple parts to count. But I'm not sure if enough interest could be generated.
4. I can't recommend anything for Aleph 30. I've been away for too long. Maybe 500VA (for 2 channels) , but couldn't be too sure about it.
5. You can do that, and if you manage to get enough gain it should work fine1. Thanks Pamaz for sharing your experience with this case, but what do you think of replacing the top and bottom parts with 5mm aluminium ?
It would be still cheaper than buying 2 heatsinks (Conrad Australia) and building a case ...
2. Actually, i was talking about the compatibility of your PCB with components of jleaman GB.
You mentionned earlier that you used irfp140 for output devices, and jleaman GB uses irfp044 and irf9610 !...
Do they fit ???? And what about the sound difference with the originals irf244 ?
3. I understand that you also have to sort these IXYS each other ????
What about using MUR860 on GC supply board ?
4. 500VA 2*25V is ok ?
5. My plans are making a kind of integrated amp ...
Basically, the PCB are really small, but we still need BIG heatsinks, so a big enclosure too...
That means that there will be enough room to put a preamp in the same box, like a Bosoz !!!
Just a rotary switch and a pot if not enough room.
What do you think of that ?
Thanks again .
I'm using IRFP 140, as I have substantial stock of them (bought them 3 years ago and still didn't use). They are compatible with IRFP 044, so fitting them on the board is not an issue. I can't comment on sound difference, as I didn't have a chance to compare.
MUR860 would be a very good choice, but I'm not sure how they stand inrush currents in a long run: they are rated 8A only. But I remember that MUR1520 wasn't bad either and are rated 15A.
25V is after rectification, so your transformer have to be around 2 x 18V AC (or 2 x 20V max).
The preamp board can be made the same size as amp board, so the size restriction shouldn't be a problem. PS might be hard to fit in, but you can add turns to the main transformer, just for the preamp section. I did that once and it worked fine (BOZ + Zen in one enclosure).
MUR860 would be a very good choice, but I'm not sure how they stand inrush currents in a long run: they are rated 8A only. But I remember that MUR1520 wasn't bad either and are rated 15A.
25V is after rectification, so your transformer have to be around 2 x 18V AC (or 2 x 20V max).
The preamp board can be made the same size as amp board, so the size restriction shouldn't be a problem. PS might be hard to fit in, but you can add turns to the main transformer, just for the preamp section. I did that once and it worked fine (BOZ + Zen in one enclosure).
Member
Joined 2002
Member
Joined 2002
cases
replacing the top and the bottom of the case is quite easy, but pls do it with aluminium at least 5mm thick.
Regarding the trafos, I've built my aleph 30 with 2 trafos 300 va each. I think that a 250va is a fair choice anyway . Regarding the voltage, of the secondary, it all depends on the filtering system that you're going to use. if it's just a simple bank of capacitors, go for 18-19V secondary, if some clc or crc arrangement is made, stay at 22-23v secondary.
My recommendation is to crank up the bias current, instead than raising the rail voltage.
Ciao
Paolo
replacing the top and the bottom of the case is quite easy, but pls do it with aluminium at least 5mm thick.
Regarding the trafos, I've built my aleph 30 with 2 trafos 300 va each. I think that a 250va is a fair choice anyway . Regarding the voltage, of the secondary, it all depends on the filtering system that you're going to use. if it's just a simple bank of capacitors, go for 18-19V secondary, if some clc or crc arrangement is made, stay at 22-23v secondary.
My recommendation is to crank up the bias current, instead than raising the rail voltage.
Ciao
Paolo
Peter Daniel said:
I've been running my A30 without sinks on the pair without issue, however I don't have mine tied together, which reduces surface area of course. I haven't measured temp, but they haven't melted yet.
Rob
Before I start sending the boards out, I have to test them, so today I was working on a power supply. Here what it looks like: 500VA Plitron is on the bottom, in its own enclosure. The Sikorel caps above (22,000/50) have ground terminals connected by 1/8" copper plate. This PS is for two channels, each channel having a pair of caps connected directly to a bridge.
You can see heatsinks in a back.
You can see heatsinks in a back.
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