Comments on: SBBPWR2 Revised design for Breadboard power supply module http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/ Microcontrollers Electronics Hobby Sun, 28 Mar 2010 03:07:45 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: alan http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1270 alan Fri, 30 May 2008 20:42:59 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1270 Dave, Quick question for C3, which hole should the negative lead of the capacitor go into? According to the Curious inventor instructions the negative side should face outward, but in all of the pictures I have seen of the new power supply board, the positive side faces outward? (Is this a mistake on the silkscreen? Dave,
Quick question for C3, which hole should the negative lead of the capacitor go into? According to the Curious inventor instructions the negative side should face outward, but in all of the pictures I have seen of the new power supply board, the positive side faces outward? (Is this a mistake on the silkscreen?

]]> By: Mr. Meval http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1274 Mr. Meval Thu, 22 May 2008 01:35:52 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1274 Very good idea and thank you for the work! A heat sink is easy to make, I've got one torn out of a laptop that would do well. It's mean to epoxy onto a D-Pak but drilling it would be easy. I also have a heat pipe from a Dell with fan. I can't think of anything else to use it for. :) Very good idea and thank you for the work!

A heat sink is easy to make, I’ve got one torn out of a laptop that would do well. It’s mean to epoxy onto a D-Pak but drilling it would be easy. I also have a heat pipe from a Dell with fan. I can’t think of anything else to use it for. :)

]]> By: Jeronimo http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1273 Jeronimo Wed, 21 May 2008 03:59:09 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1273 Very good idea. This is a very useful project for accelerating the development of prototypes using breadboards. Very good idea. This is a very useful project for accelerating the development of prototypes using breadboards.

]]> By: Hazard http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1272 Hazard Tue, 20 May 2008 12:37:32 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1272 I don't mean to hijack your webpage. But I also designed a breadboard power supply, with positive and negative output voltage. Around one month ago, I came across the ideia of breadboard power supplys, and I think I also used yours as inspiration. Schematics and more information can be found here: http://hazard.dynip.sapo.pt/joomla/index.php?option=com_content&task=view&id=47&Itemid=58&limit=1&limitstart=1 I don’t mean to hijack your webpage. But I also designed a breadboard power supply, with positive and negative output voltage.
Around one month ago, I came across the ideia of breadboard power supplys, and I think I also used yours as inspiration.
Schematics and more information can be found here:

http://hazard.dynip.sapo.pt/joomla/index.php?option=com_content&task=view&id=47&Itemid=58&limit=1&limitstart=1

]]> By: schill http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1271 schill Tue, 20 May 2008 12:33:25 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1271 Just a brief warning on a mechanical issue. Make sure that you check your breadboards before installing the support headers in both the center and outside locations - even if the width is correct. In a lot of the breadboards I've seen and purchased recently, the holes in the middle do not align with the bus holes (+ and -). They are off by a 1/2 hole. If you install both sets of headers, you will not be able to plug the board into your breadboard. There will also be problems with the breadboards sold by Parallax (which are out of stock, anyway). These have 6 holes on either side of the central gutter, making them wider than typical breadboards. Other than that, I think the change from 5 to 6 holes is a great idea - you always seem to need one more of anything and it also helps when you are plugging in chips that are wider than 0.3". Just a brief warning on a mechanical issue. Make sure that you check your breadboards before installing the support headers in both the center and outside locations – even if the width is correct. In a lot of the breadboards I’ve seen and purchased recently, the holes in the middle do not align with the bus holes (+ and -). They are off by a 1/2 hole. If you install both sets of headers, you will not be able to plug the board into your breadboard.

There will also be problems with the breadboards sold by Parallax (which are out of stock, anyway). These have 6 holes on either side of the central gutter, making them wider than typical breadboards. Other than that, I think the change from 5 to 6 holes is a great idea – you always seem to need one more of anything and it also helps when you are plugging in chips that are wider than 0.3″.

]]> By: dfowler http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1269 dfowler Wed, 14 May 2008 02:20:40 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1269 Alan, I thought you were saying that it was getting hot without a load. That should not happen. For more the about 300mA with 6V drop on the regulator you will need a heat sink. This should be easy to add as the regulator is mounted flush with the board edge to allow for this. Alan,

I thought you were saying that it was getting hot without a load. That should not happen. For more the about 300mA with 6V drop on the regulator you will need a heat sink. This should be easy to add as the regulator is mounted flush with the board edge to allow for this.

]]> By: Alan http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1268 Alan Wed, 14 May 2008 02:16:02 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1268 Oh, also I am talking about current draws between 350mA and 1400mA (led drive current) Oh, also I am talking about current draws between 350mA and 1400mA (led drive current)

]]> By: dfowler http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1267 dfowler Tue, 13 May 2008 19:56:19 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1267 Alan, The regulator should not get hot unless you are drawing substantial current from it. My testing shows that you can draw 300mA with a 6V drop on the regulator continously wihtout damage. The regulator does have overtemp and short circuit protection. On the heat sink question, the regulator is mounted flush with the edge of the board and there should be plenty of space for the typical TO-220 heat shinks. The adjust pin is broght out to a header which plugs into the breadboard. This provides stability and allows access so that you can make the module into a continously varable supply or current source. Alan,

The regulator should not get hot unless you are drawing substantial current from it. My testing shows that you can draw 300mA with a 6V drop on the regulator continously wihtout damage. The regulator does have overtemp and short circuit protection.

On the heat sink question, the regulator is mounted flush with the edge of the board and there should be plenty of space for the typical TO-220 heat shinks.

The adjust pin is broght out to a header which plugs into the breadboard. This provides stability and allows access so that you can make the module into a continously varable supply or current source.

]]> By: Alan http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1266 Alan Tue, 13 May 2008 04:41:18 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1266 Great revision. I too noticed that the original SBBPWR1 board that I owned was both wobbly and barely could fit in right with the bread board I have, it looks like from the pictures that v2 solves those issues. Although this may not be totally necessary considering the power limitations on this board, v3 should be slated with just a little more room between the LM317 and the small tantalum (or is it ceramic) cap so that the LM 317 can have a small heat sink attached to it. I noticed with the V1 board, the LM317 heated up incredibly fast regardless the load or draw it was taking and it is near impossible to fit a heat sink into the picture on the original board. Other than that, great product for people who work with LEDs alot or other low voltage gadgets and also a great first soldering experience (well... it's not my first time soldering). But from a first timers perspective, larger solder pads does sound like a good idea. Even though I have soldered for many years, I found it slightly difficult to solder the rectifier on the v1 board due to the smallest solder pad I have ever seen. Another consideration for v3 is to actually include a potentiometer position on the board in place of R1 so you do have your infinite adjust-ability on board. The last thing I can think of is to include a said of pin headers (3 pairs of 2) and 3 jumpers with V3 so that a user can configure the LM317 supply to run in either constant current, constant voltage, or adjustable voltage mode (an idea I am snagging off of one of my early attempts at a bread board power tap unit). Also it would be nice if someone could start compiling data about different bread boards by different manufacturers and tell which bread board power supply board (v1 or v2 at this time) works with it. I know for a fact it was a real tight squeeze for the v1 board to work on the Jaemco JE24 bread board. Sorry to write an essay: but one last note: if you need to keep a few spare DF01M rectifier chips around, Vishay semi conductor is kind enough to give samples (at most 10) of this rectifier and several other similar ones for free at their web page. This tid bit of news is intended as a friendly note, in other words don't go running up any time and just start sampling like crazy from Vishay, only do it when necessary and you know that you are prototyping or designing a new project and would rather only get the number of parts you need for free rather than having too many parts and not ending up using them. Great revision. I too noticed that the original SBBPWR1 board that I owned was both wobbly and barely could fit in right with the bread board I have, it looks like from the pictures that v2 solves those issues. Although this may not be totally necessary considering the power limitations on this board, v3 should be slated with just a little more room between the LM317 and the small tantalum (or is it ceramic) cap so that the LM 317 can have a small heat sink attached to it. I noticed with the V1 board, the LM317 heated up incredibly fast regardless the load or draw it was taking and it is near impossible to fit a heat sink into the picture on the original board. Other than that, great product for people who work with LEDs alot or other low voltage gadgets and also a great first soldering experience (well… it’s not my first time soldering). But from a first timers perspective, larger solder pads does sound like a good idea. Even though I have soldered for many years, I found it slightly difficult to solder the rectifier on the v1 board due to the smallest solder pad I have ever seen. Another consideration for v3 is to actually include a potentiometer position on the board in place of R1 so you do have your infinite adjust-ability on board. The last thing I can think of is to include a said of pin headers (3 pairs of 2) and 3 jumpers with V3 so that a user can configure the LM317 supply to run in either constant current, constant voltage, or adjustable voltage mode (an idea I am snagging off of one of my early attempts at a bread board power tap unit). Also it would be nice if someone could start compiling data about different bread boards by different manufacturers and tell which bread board power supply board (v1 or v2 at this time) works with it. I know for a fact it was a real tight squeeze for the v1 board to work on the Jaemco JE24 bread board. Sorry to write an essay: but one last note: if you need to keep a few spare DF01M rectifier chips around, Vishay semi conductor is kind enough to give samples (at most 10) of this rectifier and several other similar ones for free at their web page. This tid bit of news is intended as a friendly note, in other words don’t go running up any time and just start sampling like crazy from Vishay, only do it when necessary and you know that you are prototyping or designing a new project and would rather only get the number of parts you need for free rather than having too many parts and not ending up using them.

]]> By: jalspach http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/comment-page-1/#comment-1265 jalspach Sun, 11 May 2008 20:41:49 +0000 http://www.uchobby.com/index.php/2008/04/29/sbbpwr2-revised-design-for-breadboard-power-supply-module/#comment-1265 This is great, especially for a person just getting (read: me) started. I am not sure how well it would work but it would be cool to see something similar that would provide clocking. a small board that provides a few selectable frequencies running along side this module would allow a person who is new to microprocessors to get started right away. Thanks again and I love the site. This is great, especially for a person just getting (read: me) started. I am not sure how well it would work but it would be cool to see something similar that would provide clocking. a small board that provides a few selectable frequencies running along side this module would allow a person who is new to microprocessors to get started right away.
Thanks again and I love the site.

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