what size will the taps be?
just for instance running the mill through the other direction as well to give a grid-like pattern would dramatically increase the surface area/dissipation and i presume wouldnt take too much extra time to design, however machine time (which = money) would be almost doubled i guess
just for instance running the mill through the other direction as well to give a grid-like pattern would dramatically increase the surface area/dissipation and i presume wouldnt take too much extra time to design, however machine time (which = money) would be almost doubled i guess
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I'm speaking now before putting much thought into it ... but is there much likelihood that a bunch of us will be putting these in similar enclosures?
For mine I was intending to go for a monoblock style and mount each in its own enclosure close to the speaker.
Would there be much saving in buying enclosures in a GB?
The main part that I've not worked out is how much ventilation will be needed to allow heatsinks to work effectively.
Happy to be told its not worth it and everyone sort out their own though!
For mine I was intending to go for a monoblock style and mount each in its own enclosure close to the speaker.
Would there be much saving in buying enclosures in a GB?
The main part that I've not worked out is how much ventilation will be needed to allow heatsinks to work effectively.
Happy to be told its not worth it and everyone sort out their own though!
qusp:
The fins are a touch over 3mm thick and 25mm high. , The gap in between is 6mm, which allows me to use a 6mm end mill that will be quite happy doing a 25mm deep slot. A smaller diameter cutter is much more susceptible to vibration and the feedrate and depth of cut has to be reduced accordingly. If I were to machine 6mm slots in the other direction also, it wouldn't leave much fin left and would probably reduce the total fin area. It also would make the fins very fragile which makes machining more difficult (read slower
) You are correct that we aren't restricted by your typical extrusion profile though. I could make the fins a wave shape for example.
Regarding a chassis, I did have a bit of a crazy idea of machining aluminium blocks to replace the heatsinks on the regs and buffers. These blocks would then be screwed to a finned billet chassis. This is probably overkill but maybe an amp with this level of performance deserves a nice thick walled custom chassis? It's small enough that a billet chassis would not be too out of the question cost wise I think.
I'll draw something up on Monday and post a pic in the main thread.
Edit : qusp, it's no problem to get other colours done, but my anodiser charges $50 minimum. So basically for $50 you could get 1 done or probably 20.
The fins are a touch over 3mm thick and 25mm high. , The gap in between is 6mm, which allows me to use a 6mm end mill that will be quite happy doing a 25mm deep slot. A smaller diameter cutter is much more susceptible to vibration and the feedrate and depth of cut has to be reduced accordingly. If I were to machine 6mm slots in the other direction also, it wouldn't leave much fin left and would probably reduce the total fin area. It also would make the fins very fragile which makes machining more difficult (read slower
) You are correct that we aren't restricted by your typical extrusion profile though. I could make the fins a wave shape for example. Regarding a chassis, I did have a bit of a crazy idea of machining aluminium blocks to replace the heatsinks on the regs and buffers. These blocks would then be screwed to a finned billet chassis. This is probably overkill but maybe an amp with this level of performance deserves a nice thick walled custom chassis? It's small enough that a billet chassis would not be too out of the question cost wise I think.
I'll draw something up on Monday and post a pic in the main thread.
Edit : qusp, it's no problem to get other colours done, but my anodiser charges $50 minimum. So basically for $50 you could get 1 done or probably 20.
Great thread guys!!! There is some very cool stuff here, and this is a great opportunity to make something much better as a group than any one of us could do by ourselves!
Hypertune:
I'll send you detailed info on the dimensions of the power amp where the buffers are. As a few people here mentioned, we will definitely need to use thermal pads on the junction to the PCB and the tops of the buffers. That should give us enough wiggle room to accomodate imperfect soldering and all the other tolerances. There are thermal pads out there that are every bit as effective (and sometimes more effective) than thermal paste, and this is even more true when the mechanical stackup is such that you cannot get perfect contact.
Also, count me in for 6 pieces:
Custom CNC Alloy Heatsinks, kindly machined by Hypertune
qusp 4
hochopeper 2
opc 6
_______
total 12
If you do have plans for a chassis, I might also be interested in that depending on price and whether or not you're willing to put that much work into machining parts!
If you did go that way, it really opens up a lot of options in terms of heatsinking.
Cheers,
Owen
Hypertune:
I'll send you detailed info on the dimensions of the power amp where the buffers are. As a few people here mentioned, we will definitely need to use thermal pads on the junction to the PCB and the tops of the buffers. That should give us enough wiggle room to accomodate imperfect soldering and all the other tolerances. There are thermal pads out there that are every bit as effective (and sometimes more effective) than thermal paste, and this is even more true when the mechanical stackup is such that you cannot get perfect contact.
Also, count me in for 6 pieces:
Custom CNC Alloy Heatsinks, kindly machined by Hypertune
qusp 4
hochopeper 2
opc 6
_______
total 12
If you do have plans for a chassis, I might also be interested in that depending on price and whether or not you're willing to put that much work into machining parts!
If you did go that way, it really opens up a lot of options in terms of heatsinking.
Cheers,
Owen
aaaaaaaarrrrggghhhh i just replied to all of the posts directed at me and the forum logged me out while i was doing it so it all vanished, anyone else been having this problem the last few days? i spent bloody ages on it too!!
methinks there are a few bugs that have come along with the latest improvements.
anyway some might have noticed the first post has been updated; thanks to the mods, suggested by Andrew T and implemented by Jason; as of this morning the threadstarter now has full and permanent edit capability on the first post, so i'll be updating it periodically. i'll try and keep on top of developments, but if anyone sees any omissions or has suggestions for other lists or info that could be included please do.
this feature will hopefully help to ease the frustration that comes with repeating the same info, but we still need to get people to actually READ the first post.
i'll reply to people shortly, i cant do it again right now. i had gotten into the habit of copying a long post before sending just in case this happened, but it hasnt happened to me in a while so i guess i got slack.
methinks there are a few bugs that have come along with the latest improvements.
anyway some might have noticed the first post has been updated; thanks to the mods, suggested by Andrew T and implemented by Jason; as of this morning the threadstarter now has full and permanent edit capability on the first post, so i'll be updating it periodically. i'll try and keep on top of developments, but if anyone sees any omissions or has suggestions for other lists or info that could be included please do.
this feature will hopefully help to ease the frustration that comes with repeating the same info, but we still need to get people to actually READ the first post.
i'll reply to people shortly, i cant do it again right now. i had gotten into the habit of copying a long post before sending just in case this happened, but it hasnt happened to me in a while so i guess i got slack.
tommy are you just speculatively grabbing these now on the chance opc will do a run of extra pcb in the future without any changes to the layout?
@qusp, is it worth getting a list of who's in for pcb from opc and putting that in the first post?
I'd like to know the general opinion on how restricted the scope of the GB should be? For LPUHP specific items like custom machined heatsinks/enclosures there really isn't much point anyone but those who've got pcbs on the way getting any. Its a unnecessary drain on the time/resources of the volunteers.
@qusp, is it worth getting a list of who's in for pcb from opc and putting that in the first post?
I'd like to know the general opinion on how restricted the scope of the GB should be? For LPUHP specific items like custom machined heatsinks/enclosures there really isn't much point anyone but those who've got pcbs on the way getting any. Its a unnecessary drain on the time/resources of the volunteers.
i already stated in the first page that it should be limited to those in the current GB, but it seems Tommy did not read this.....
I want this GB to be simple for everyone, Mark is already doing us a favor by doing the sinks, i do not think its fair to ask him to make them for people who do not even have the pcb. i do not want to end up with people ordering parts just because the price is good, IMO its for the GB members. we do not intend to make money on this, its intended for us to band together to get good pricing without becoming too large of an effort for anyone; especially Hypertune because he runs a professional business with this equipment that would normally be charged out at quite a significant sum i imagine.
while the number of members involved is reasonably low as it is now its much more manageable to do on a volunteer basis, end up with 100 people wanting sinks or chassis and Marks business is tied up for a week making nothing
sorry tommy, i'll go edit the first post now.
I want this GB to be simple for everyone, Mark is already doing us a favor by doing the sinks, i do not think its fair to ask him to make them for people who do not even have the pcb. i do not want to end up with people ordering parts just because the price is good, IMO its for the GB members. we do not intend to make money on this, its intended for us to band together to get good pricing without becoming too large of an effort for anyone; especially Hypertune because he runs a professional business with this equipment that would normally be charged out at quite a significant sum i imagine.
while the number of members involved is reasonably low as it is now its much more manageable to do on a volunteer basis, end up with 100 people wanting sinks or chassis and Marks business is tied up for a week making nothing
sorry tommy, i'll go edit the first post now.
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good idea
Custom CNC Alloy Heatsinks, kindly machined by Hypertune
qusp 4
hochopeper 2
opc 6
bcg27 2
1543 2
_______
total 16
I was having a look around tonight for extruded alu enclosures. The style I am thinking about tonight was something along the lines of -
14-1004 Enclosure for 200mm X 105mm PCB
or
Hammond Mfg. - Extruded Aluminum Enclosures (Sink Box Series)
If a sealed enclosure like this was used how much ventilation should I be looking to add given I'll have ambient temps around 35-40 deg Celsius
What are others thoughts?
14-1004 Enclosure for 200mm X 105mm PCB
or
Hammond Mfg. - Extruded Aluminum Enclosures (Sink Box Series)
If a sealed enclosure like this was used how much ventilation should I be looking to add given I'll have ambient temps around 35-40 deg Celsius
What are others thoughts?
Hi Guys,
Here's a list of all active participants who got boards:
1543 2
badabing 2
bcg27 2
Ed LaFontaine 2
enantra 2
exa065 4
hochopeper 2
HYPERTUNE 2
jacobthellamer 2
jazzm 2
maravedis 4
neb001 4
particleman14 2
qusp 2
randytsuch 2
regal 2
sharpi31 2
Wirewiggler 2
Wolfsin 2
I've also attached an excel list with totals. I'll post this up in the main thread as well and send out payment requests this afternoon.
Cheers,
Owen
Here's a list of all active participants who got boards:
1543 2
badabing 2
bcg27 2
Ed LaFontaine 2
enantra 2
exa065 4
hochopeper 2
HYPERTUNE 2
jacobthellamer 2
jazzm 2
maravedis 4
neb001 4
particleman14 2
qusp 2
randytsuch 2
regal 2
sharpi31 2
Wirewiggler 2
Wolfsin 2
I've also attached an excel list with totals. I'll post this up in the main thread as well and send out payment requests this afternoon.
Cheers,
Owen
perfect! thats all i meant, just using that other dimension that is simply not available to extrusions to make it look a bit trick and if it improves dissipation too, thats all well and good
even better!, a man after my own heart. we would have to try and reach some sort of consensus on input and output connectors, as well as how they will switch on. as mentioned i can get nice pricing on all the Eichmann gear, they dont have XLR, but i'll probably be using lemo anyway, in fact to match the rest of my kit i'll probably use lemos and maybe XLR for input, with speakon and the ETI posts for output
nice one
well i'm sure there'll be enough of us, if not all of us that would be keen on getting the sink or chassis anodised to make it worthwhile. However I might have to settle on a slightly tamer colour than Blue =) olive/army green might look pretty sweet? not bright, or just gunmetal grey
@Ed: yeah his wire is great, i have heaps of it i use for prototyping as its cheap, pretty excellent and comes in multiple colours. i'll probably be using neotech solid core copper though for input and output; considering how short and few those connections will probably be, it wont cost much at all
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so i guess now's as good a time as any to start the lme49600 (OK OK) and LME49990 list
dont know the costs, but you can guarantee that it'll be cheaper than buying yourself. i'm going to suggest making the standard order 20 pieces of buffer and 8-10 of the opamp, does anyone object to this?
i'll be buying more, as i use these guys all the time, they make for excellent high speed wideband regulators too. (ask me how or look up the lme49600 datasheet for where i stole the initial idea from)
so this isnt a final commitment of course but just to start getting ideas of numbers
Audio IC's
LME49600
qusp 40
LME49990
qusp 20
dont know the costs, but you can guarantee that it'll be cheaper than buying yourself. i'm going to suggest making the standard order 20 pieces of buffer and 8-10 of the opamp, does anyone object to this?
i'll be buying more, as i use these guys all the time, they make for excellent high speed wideband regulators too. (ask me how or look up the lme49600 datasheet for where i stole the initial idea from)
so this isnt a final commitment of course but just to start getting ideas of numbers
Audio IC's
LME49600
qusp 40
LME49990
qusp 20
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