Heatsinks - Revision history

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T02:03:52Z

Poor TO-220 Heatsinking

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T02:03:39Z

Poor TO-220 Heatsinking

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T02:01:42Z

Poor TO-220 Heatsinking

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T02:01:02Z

Poor TO-220 Heatsinking

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T02:00:45Z

Poor TO-220 Heatsinking

ViciousCarnivore at 01:56, 22 January 2025

2025-01-22T01:56:15Z

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T01:55:37Z

Poor TO-220 Heatsinking

ViciousCarnivore: /* Poor TO-220 Heatsinking */

2025-01-22T01:55:25Z

Poor TO-220 Heatsinking

ViciousCarnivore at 01:54, 22 January 2025

2025-01-22T01:54:01Z

ViciousCarnivore at 07:27, 30 December 2024

2024-12-30T07:27:07Z

@@ Line 8: / Line 8: @@
 [[File:Boardmount heatsink.jpg|150px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for these (a separate piece of metal, or connected to the original as a type of clamp). Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
 [[File:Bottom board 1.jpg|150px|thumb|right|Loose TO-220's. What isn't shown here is how the chassis was essentially supposed to make contact with these by virtue of them being 'sort of close'. Because there was no screw or bolt to hold them in, they were hanging and had an air gap.]]
-[[File:Boardmount heatsink2.jpg|150ps|thumb|right|Here is an example of the clamping type of heatsink, though there are others where the two pieces are separate.]]
+[[File:Boardmount heatsink2.jpg|150px|thumb|right|Here is an example of the clamping type of heatsink, though there are others where the two pieces are separate.]]
 I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.
 [[Category:online notes]]

@@ Line 8: / Line 8: @@
 [[File:Boardmount heatsink.jpg|150px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for these (a separate piece of metal, or connected to the original as a type of clamp). Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
 [[File:Bottom board 1.jpg|150px|thumb|right|Loose TO-220's. What isn't shown here is how the chassis was essentially supposed to make contact with these by virtue of them being 'sort of close'. Because there was no screw or bolt to hold them in, they were hanging and had an air gap.]]
 I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.
 [[Category:online notes]]

@@ Line 6: / Line 6: @@
 ===Poor TO-220 Heatsinking===
-[[File:Boardmount heatsink.jpg|150px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
+[[File:Boardmount heatsink.jpg|150px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for these (a separate piece of metal, or connected to the original as a type of clamp). Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
 [[File:Bottom board 1.jpg|150px|thumb|right|Loose TO-220's. What isn't shown here is how the chassis was essentially supposed to make contact with these by virtue of them being 'sort of close'. Because there was no screw or bolt to hold them in, they were hanging and had an air gap.]]
 I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.

@@ Line 6: / Line 6: @@
 ===Poor TO-220 Heatsinking===
-[[File:Boardmount heatsink.jpg|200px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
+[[File:Boardmount heatsink.jpg|150px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
-[[File:Bottom board 1.jpg|200px|thumb|right|Loose TO-220's. What isn't shown here is how the chassis was essentially supposed to make contact with these by virtue of them being 'sort of close'. Because there was no screw or bolt to hold them in, they were hanging and had an air gap.]]
+[[File:Bottom board 1.jpg|150px|thumb|right|Loose TO-220's. What isn't shown here is how the chassis was essentially supposed to make contact with these by virtue of them being 'sort of close'. Because there was no screw or bolt to hold them in, they were hanging and had an air gap.]]
 I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.
 [[Category:online notes]]

@@ Line 7: / Line 7: @@
 ===Poor TO-220 Heatsinking===
 [[File:Boardmount heatsink.jpg|200px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]]
 I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.
 [[Category:online notes]]

@@ Line 3: / Line 3: @@
 ===List===
 * https://www.eevblog.com/forum/projects/heatsink-for-power-so8-package/msg5763881/?topicseen#msg5763881 Interesting piece of sheet metal bonded to a power so8 package. Maybe it's using thermal glue.
 [[Category:online notes]]

← Older revision		Revision as of 07:27, 30 December 2024
Line 3:		Line 3:
	===List===		===List===
	* https://www.eevblog.com/forum/projects/heatsink-for-power-so8-package/msg5763881/?topicseen#msg5763881 Interesting piece of sheet metal bonded to a power so8 package. Maybe it's using thermal glue.		* https://www.eevblog.com/forum/projects/heatsink-for-power-so8-package/msg5763881/?topicseen#msg5763881 Interesting piece of sheet metal bonded to a power so8 package. Maybe it's using thermal glue.
		+
		+
		+	[[Category:online notes]]