tinnnnggggggggg.......
THUMPPP!!!!! What is your point exactly? I, for one, am still working on it. But took a break for visits with and from my and my wifes family. I am sure that plenty of other people are working on this design and I look foward to their observations and experiences. Grey, Peter, Ian.........?
H.H.
THUMPPP!!!!! What is your point exactly? I, for one, am still working on it. But took a break for visits with and from my and my wifes family. I am sure that plenty of other people are working on this design and I look foward to their observations and experiences. Grey, Peter, Ian.........?
H.H.
Don't take it personally Harry. I was just noting that this thread was buzzing for a while, and now it is eerily quiet. I wasn't necessarily talking to you. How is the Tex-x coming, BTW?
On the run...what else is new?...but I wanted to drop in and say that the intent of the adjustment isn't to zero the Gates of the outputs--it's to zero the outputs relative to ground.
I haven't abandoned the circuit, it's just that life has taken a few unpleasant turns recently and I'm still trying to regain my equilibrium. I now have the regulator circuit running (on punch boards...no, Harry, no oscillations in the regulators yet). I'd like to thank Paul (paulb) for his gracious donation of P-ch MOSFETs for the regulator. I'd hoped to locate some fairly serious passive heatsinking (i.e. air-cooled) for this project, as I'd like to be able to move it around, but it appears that I'll be going water-cooled after all; the surplus market isn't cooperating at the moment, and buying a six-foot section of extrusion just isn't in the cards, financially. Bummer. Choice of heatsinking was delaying PBC layout, so I'll be getting back to that shortly, I hope.
Grey
I haven't abandoned the circuit, it's just that life has taken a few unpleasant turns recently and I'm still trying to regain my equilibrium. I now have the regulator circuit running (on punch boards...no, Harry, no oscillations in the regulators yet). I'd like to thank Paul (paulb) for his gracious donation of P-ch MOSFETs for the regulator. I'd hoped to locate some fairly serious passive heatsinking (i.e. air-cooled) for this project, as I'd like to be able to move it around, but it appears that I'll be going water-cooled after all; the surplus market isn't cooperating at the moment, and buying a six-foot section of extrusion just isn't in the cards, financially. Bummer. Choice of heatsinking was delaying PBC layout, so I'll be getting back to that shortly, I hope.
Grey
Thanks for the reply, Grey. I know you're busy. Hope everything is getting back to normal.
I had a feeling that the dc adjustment for the front end was to put the outputs at 0V... the wording in your original post just threw me off a little.
I hope to start building my monoblocks in the next month or so. Heat sinking will be a problem for me also. I plan at this point to get a nice sized piece of copper and mount multiple smaller sinks to make a single larger sink. If that dosen't work, I will be making a sink from aluminum U-channel.
Thanks again.
Steve
I had a feeling that the dc adjustment for the front end was to put the outputs at 0V... the wording in your original post just threw me off a little.
I hope to start building my monoblocks in the next month or so. Heat sinking will be a problem for me also. I plan at this point to get a nice sized piece of copper and mount multiple smaller sinks to make a single larger sink. If that dosen't work, I will be making a sink from aluminum U-channel.
Thanks again.
Steve
I'm sure it's just me, but it seems silly that the recurrent problem for solid state DIY is heatsinks. Resistors, caps, transistors, even transformers can be had...but then you bang your nose into this intractable problem of getting rid of a few watts of excess heat. Okay, maybe more than just a few, at least in the case of class A power amps. It's a bit frustrating in the 'so near and yet so far' sense.
Maybe I'll go back to tubes. At least their heatsinks are built-in. I've learned a few things since I built my last pair--perhaps it's time to see if I can sneak ahead of the solid state stuff again.
Grey
Maybe I'll go back to tubes. At least their heatsinks are built-in. I've learned a few things since I built my last pair--perhaps it's time to see if I can sneak ahead of the solid state stuff again.
Grey
Heatsinks.....
Grey, you raise the issue of heatsinks.
I live in Melbourne, Australia, as you know, and a few years ago came upon a pressure cast heatsink manufacturer here called Conrad Engineering. Over the years I've bought many heatsinks from Julian, the engineer who owns the business. In fact, we are now close friends.
Julian is not a particularly good marketer, and tends to be swept away by the day to day engineering issues, which are of course quite absorbing. He runs a 50 Kilowatt electric furnace, and also supports quite a lot of machining to give his 'sinks a marvellous finish and proper quality control.
Recently I introduced him to a good webmaster, and presently he is planning a website which will market worldwide. When this happens, I will send you the link; it could be very useful.
What distinguishes the Conrad heatsinks is their ledge, something not possible on an extrusion. You can thus mount pcbs and semis to the horizontal ledge, and all heat the flows into the heatsink base and then to the vertical fins. I use these 'sinks in all my AKSA designs, and they attract universal praise for their quality.
Of course, air freight will add to the cost, but when you factor in the Oz dollar (which we affectionately refer to as the Pacific peso!) you can land these 'sinks anywhere in the States at highly competitive prices. For example, a 0.37W/C sink, 12" long and 3" tall, with thirty fins and a 1 3/4" ledge, is around $US15, and freight is around the same. So cost at $US30 is still competitive, particularly when you consider it is much easier to work with.
A complete range is available, and one is quite remarkable; the tips of the fins are just perfectly formed, and only 1mm in width!
I am not in any way commercially associated with Conrad Heatsinks. I'm in the amp business, just use 'em, that's all. 🙂
Cheers,
Hugh
www.printedelectronics.com
Grey, you raise the issue of heatsinks.
I live in Melbourne, Australia, as you know, and a few years ago came upon a pressure cast heatsink manufacturer here called Conrad Engineering. Over the years I've bought many heatsinks from Julian, the engineer who owns the business. In fact, we are now close friends.
Julian is not a particularly good marketer, and tends to be swept away by the day to day engineering issues, which are of course quite absorbing. He runs a 50 Kilowatt electric furnace, and also supports quite a lot of machining to give his 'sinks a marvellous finish and proper quality control.
Recently I introduced him to a good webmaster, and presently he is planning a website which will market worldwide. When this happens, I will send you the link; it could be very useful.
What distinguishes the Conrad heatsinks is their ledge, something not possible on an extrusion. You can thus mount pcbs and semis to the horizontal ledge, and all heat the flows into the heatsink base and then to the vertical fins. I use these 'sinks in all my AKSA designs, and they attract universal praise for their quality.
Of course, air freight will add to the cost, but when you factor in the Oz dollar (which we affectionately refer to as the Pacific peso!) you can land these 'sinks anywhere in the States at highly competitive prices. For example, a 0.37W/C sink, 12" long and 3" tall, with thirty fins and a 1 3/4" ledge, is around $US15, and freight is around the same. So cost at $US30 is still competitive, particularly when you consider it is much easier to work with.
A complete range is available, and one is quite remarkable; the tips of the fins are just perfectly formed, and only 1mm in width!
I am not in any way commercially associated with Conrad Heatsinks. I'm in the amp business, just use 'em, that's all. 🙂
Cheers,
Hugh
www.printedelectronics.com
If what you're saying is correct, he will have A LOT of business. I would be extremely happy to find a sink like that for $30US
Guys,
Hugh is right on the money here.
I have used Conrads extrusions for all my Aleph's, they are perfectly machined and he has an extensive range flanged and unflanged down to about 0.21 c per watt.
It may pay to jump friendly freight calculators to do some costings.
If you are interested I can chase up contact details so you can fax for information.
Sorry I can't offer any specs at the moment, my Conrad catalogue in at my fathers machine workshop waiting completion of the Aleph 2 chassis.
regards
Ian
Hugh is right on the money here.
I have used Conrads extrusions for all my Aleph's, they are perfectly machined and he has an extensive range flanged and unflanged down to about 0.21 c per watt.
It may pay to jump friendly freight calculators to do some costings.
If you are interested I can chase up contact details so you can fax for information.
Sorry I can't offer any specs at the moment, my Conrad catalogue in at my fathers machine workshop waiting completion of the Aleph 2 chassis.
regards
Ian
Hugh is correct
I have been using conrad heatsinks for 15 years or so and there is not any that is cheaper or better...
Anthony Holton
www.aussieamplifiers.com
I have been using conrad heatsinks for 15 years or so and there is not any that is cheaper or better...
Anthony Holton
www.aussieamplifiers.com
I am definitely interested... please supply contact details. I would be willing to pay for shipping, if it isn't completely insane.
Right now, my alternative is to use a bunch of 2.2 C/W heatsinks that I bought surplus mounted to a copper plate, hoping to obtain enough area to keep it cool. Dosen't sound promising. Grey is right- heatsinks are the big hold-up, at least in the US.
Right now, my alternative is to use a bunch of 2.2 C/W heatsinks that I bought surplus mounted to a copper plate, hoping to obtain enough area to keep it cool. Dosen't sound promising. Grey is right- heatsinks are the big hold-up, at least in the US.
Originally posted by AKSA
See: http://www.users.bigpond.net.au/mefinnis/images/module_A5.jpg
These are 300mm x 150mm with Rt = 0.25C/W at 80C
Cost = $AUD78 for Two (ie. about $US20 each!!!)
For those in Oz (the rest of you weep!):
Julian Wales
Conrad Engineering
36 Victoria St
Brunswick East VIC 3057
Ph: (03) 9387 7106
nice bloke ...... good product 😉
cheers, mark
I am definitely not associated, but strongly second this, Julian bent over backwards to help me. The sinks I am using for my Aleph5 are dual ledge, so are perfect for a combined "all-in-one" layout:
See: http://www.users.bigpond.net.au/mefinnis/images/module_A5.jpg
These are 300mm x 150mm with Rt = 0.25C/W at 80C
Cost = $AUD78 for Two (ie. about $US20 each!!!)
For those in Oz (the rest of you weep!):
Julian Wales
Conrad Engineering
36 Victoria St
Brunswick East VIC 3057
Ph: (03) 9387 7106
nice bloke ...... good product 😉
cheers, mark
Okay,
I zip up some details tomorrow,
I wonder if Julian has internet access at home!
regards
Ian
I zip up some details tomorrow,
I wonder if Julian has internet access at home!
regards
Ian
These 2 PDF files were from Printed Electronics when they used to sell Conrad sinks, please note - they no longer do this, use the contact to Julian above
http://www.users.bigpond.net.au/mefinnis/files/conrad_hs_flanged.pdf
http://www.users.bigpond.net.au/mefinnis/files/conrad_hs_flatback.pdf
This may give you some ideas!
cheers, mark
http://www.users.bigpond.net.au/mefinnis/files/conrad_hs_flanged.pdf
http://www.users.bigpond.net.au/mefinnis/files/conrad_hs_flatback.pdf
This may give you some ideas!
cheers, mark
Heat sink problems?
I have only problem with time.😉
I just wanted to say that I'm back and I figure, I still have a chance to be the first with a best SS amp out there.😉 Some heat sinks and chassis' I keep ready for that purpose. CD project might wait after all. Since I broke a collar bone 2 weeks ago I have to excercise as well.😉
I have only problem with time.😉
I just wanted to say that I'm back and I figure, I still have a chance to be the first with a best SS amp out there.😉 Some heat sinks and chassis' I keep ready for that purpose. CD project might wait after all. Since I broke a collar bone 2 weeks ago I have to excercise as well.😉
Attachments
Do I see 2 pairs of Aleph 5 monoblocks on the table? I know one pair is operating ... as shown on the PassDiy.
Re; Heatsinks
Hpotter, where did you get those Heatsinks? How much were they? Could you provide us some information, they look totally awesome.
Your quest to build the "Best" SS amp wouldn't preclude you from sharing with fellow DIY'ers would it? 🙂
Anthony
Hpotter, where did you get those Heatsinks? How much were they? Could you provide us some information, they look totally awesome.
Your quest to build the "Best" SS amp wouldn't preclude you from sharing with fellow DIY'ers would it? 🙂
Anthony