|
the great heatsink search
I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao |
the great heatsink search
Pete KE9OA wrote:
Mouser. 532-244609B02 "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Apart from some teflon wire (thanks again Pete), Mouser had most of what I needed. Unfortunately, they no longer carry said heatsink. Thanks though. Other ideas ?? Gary |
the great heatsink search
Mouser. 532-244609B02
"Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao |
the great heatsink search
start he
http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao |
the great heatsink search
Pete KE9OA wrote:
start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary |
the great heatsink search
Apart from some teflon wire (thanks again Pete), Mouser had most of what I needed. Unfortunately, they no longer carry said heatsink. Thanks though. Other ideas ?? Gary =================================== For large heatsinks (perhaps not precisely the type you need ) flea markets will be a likely source . Otherwise there might be an electronics surplus store in your area . Some time ago someone gave me a clapped-out (probably illegal) CB amplifier (of Italian origin) with a heat sink to suit your project .........however I am in Scotland- UK ,otherwise I would be happy to send it to you . Frank GM0CSZ / KN6WH |
the great heatsink search
Highland Ham wrote:
Apart from some teflon wire (thanks again Pete), Mouser had most of what I needed. Unfortunately, they no longer carry said heatsink. Thanks though. Other ideas ?? Gary =================================== For large heatsinks (perhaps not precisely the type you need ) flea markets will be a likely source . Otherwise there might be an electronics surplus store in your area . Some time ago someone gave me a clapped-out (probably illegal) CB amplifier (of Italian origin) with a heat sink to suit your project ........however I am in Scotland- UK ,otherwise I would be happy to send it to you . Frank GM0CSZ / KN6WH Thanks for the thoughts Frank. I would not have guessed this before the fact but I'm finding that tracking down / scrounging these bits and pieces is actually fun (I am also sure that there is great probability that I will rue these words...). Thanks again all. Gary |
the great heatsink search
Gary wrote:
I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Aavid makes so many heat sinks that you almost have to buy custom to get what you need. Usually your best bet with heatsinks for a one-off is to find one that meets your needs and use it, even if it's not identically the same thing as the plans. If you can find one with specifications get one that matches the thermal conductivity to the air as what you have; if you can't get one with specifications look for about the same or greater total surface area and fin spacing. The handbook used to have directions on bending heatsinks from sheet -- you basically make a bunch of nested 'U's with heat sink compound between. I don't know how well that works, or if they still do it. I suspect that for natural convection you'll be fine with that. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html |
the great heatsink search
Gary wrote:
I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Don't worry about finding the exact, go the next bigger heatsink! You will not be sorry you did. While you are at it, consider mounting a muffin fan on the sink to push air though the ribs (if the plans don't already call for one.) Again, you won't be sorry you did! I have not seen the plans you are speaking of, but I am taking it for granted it is a leen-e-air. Regards, JS |
the great heatsink search
"Gary" wrote in message
. .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary I don't have a copy or the 2006 handbook, so I can't visualize the heatsink that you're looking for. Low resistance heatsinks are usually made from extrusions and can be any of a number of designs. Is there a photo in the article that shows the heatsink? Possible for you to post a scan of it on alt.binaries.schematics.electronic? Also, the dimensions of the heatsink would help to find a substitute and source. If you're in or near the central Florida area, Skycraft usually has a couple bins of heavy heatsinks that might suit the job. I bought a couple that calculates to about 0.5 degC/watt each about a year ago. Last time I was in the store (in February this year), they still had about 10 of them on the shelf. You mentioned that it was also used on the FARA amp. Is there a link to a web page that describes (hopefully with a photo) the amp? Cheers!! -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Experience: What you get when you don't get what you want |
the great heatsink search
Oh, that's ok Gary. I hope you find the one you are looking for. Most of
that stuff from Surplus Sales of Nebraska came from the Inventory Disposal sale from Rockwell-Collins, which means that it is of good quality. Pete "Gary" wrote in message . .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary |
the great heatsink search
Pete KE9OA wrote:
Oh, that's ok Gary. I hope you find the one you are looking for. Most of that stuff from Surplus Sales of Nebraska came from the Inventory Disposal sale from Rockwell-Collins, which means that it is of good quality. Pete "Gary" wrote in message . .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary Thanks one and all for the suggestions. Started soldering this evening so there's no turning back... Gary |
the great heatsink search
Gary wrote: Pete KE9OA wrote: Oh, that's ok Gary. I hope you find the one you are looking for. Most of that stuff from Surplus Sales of Nebraska came from the Inventory Disposal sale from Rockwell-Collins, which means that it is of good quality. Pete "Gary" wrote in message . .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary Thanks one and all for the suggestions. Started soldering this evening so there's no turning back... Gary I've found several good heatsinks and power supplies at Goodwill. I purchased an old stereo amp that had 6 100 watt channels. The last one I bought cost less than $20. I am really surprised at the way people cast things like this off. It is now the heart of my home entertainment system. Jimmie |
the great heatsink search
wrote:
Gary wrote: Pete KE9OA wrote: Oh, that's ok Gary. I hope you find the one you are looking for. Most of that stuff from Surplus Sales of Nebraska came from the Inventory Disposal sale from Rockwell-Collins, which means that it is of good quality. Pete "Gary" wrote in message . .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary Thanks one and all for the suggestions. Started soldering this evening so there's no turning back... Gary I've found several good heatsinks and power supplies at Goodwill. I purchased an old stereo amp that had 6 100 watt channels. The last one I bought cost less than $20. I am really surprised at the way people cast things like this off. It is now the heart of my home entertainment system. Jimmie \ Don't forget old land mobile radios like MASTR II, Mitrek or SyntorX for some heat sinks with great thermal mass. You may need some metalworking tools to cut off and smooth down the mating area neded for your device layout. -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P |
the great heatsink search
On Tue, 22 Jul 2008 00:36:31 -0700, Gary wrote:
Pete KE9OA wrote: Oh, that's ok Gary. I hope you find the one you are looking for. Most of that stuff from Surplus Sales of Nebraska came from the Inventory Disposal sale from Rockwell-Collins, which means that it is of good quality. Pete "Gary" wrote in message . .. Pete KE9OA wrote: start he http://www.mouser.com/Search/Refine....N=1323038&No=0 if you know the parameters of the heat sink in question, a search through these pages on the Mouser website should give you what you need. there are several pages to go through, so you do have your work cut out for you! Pete "Gary" wrote in message ... I'm finding that if you're looking for any heatsink that there are zillions of places to pick one up and that if you are looking for a particular sink that it is a futile task. With a little help from my friends, I'm putting together the mosfet amp in the 2006 handbook and I've pretty much secured everything on the parts list save the heatsink. It is the same unit that was used on the original FARA amp as well. Anyone have this beast in the junk bin or know of a purveyor who might?? I've scoured the web and no joy so far. The sink is an AAVID part (#244609B02). Thanks in advance all. Gary ka9rao Thanks for the advice. Mouser very nearly had a replacement. The unit has horizontal fins instead of vertical and as my application is convection-only, this likely tips the balance on effectiveness (safety). Did find another site and it looks like a good one. It's Nebraska Sales and Surplus. I've purchased from them before and have no complaints. Thanks again for the quick replies. Gary Thanks one and all for the suggestions. Started soldering this evening so there's no turning back... Gary OK, I found a copy of the article that you're building. If it's the same article that's in the 2007 handbook (titled "A Broadband HF Amplifier Using Low-cost MOSFETs" bu WA2EBY), then maybe I can help with the heatsink. I found a photo in the article that shows pretty clearly the heatsink as mounted on the rear of the chassis. I'm guessing at the dimensions of the rear panel of the chassis. The box is given as 3.5x6x8, but it's hard to conclude whether the rear panel is 3.5x6 or 3.5x8. I assumed the rear panel to be 3.5x8, did a bit of extrapolation and estimated the size of the heatsink to be approximately 5.5" wide, 2.75" tall, 1.25" fin height. Newark shows a heatsink meeting those measurements (approximately) at http://www.newark.com/54M0782/fans-h...ik-sk-85-75-sa, and appears to be in stock. The given measurements for that heatsink are 160mm wide, 75mm tall and 40mm fin height, with a thermal resistance of 1.2 degC/watt. No clear area in the middle, so you'll likely have to drill & tap the base to mount the transistors. The heatsink itself is reasonable enough, but the caveat is that it's stocked in the UK and drop shipped from there, with a $20 handling fee. I stopped searching when I found that heatsink, so you might do a more thorough search using those approximate measurements and find something suitable, and less expensive. Cheers!!! ============== Dave M Never take a laxative and a sleeping pill at the same time!! |
| All times are GMT +1. The time now is 12:14 PM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com