tag:blogger.com,1999:blog-824114889882641219.post6172031139692662256..comments2024-03-13T22:23:03.736-07:00Comments on effluvia of a scattered mind: constant current LED driver thoughts (LM334)Andrew Stonehttp://www.blogger.com/profile/04769383353032832222noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-824114889882641219.post-41721811076010094812022-12-01T22:30:06.913-08:002022-12-01T22:30:06.913-08:00For contemporary homes, the Polish company Savinge...For contemporary homes, the Polish company Savingenergytech has created the Magnetic Track lighting</a> series, a unique and highly useful track lighting. Its diversity and complementarity, which enable you to design an entirely unique lighting system in the room, are its main assets. Outdoor garden lighting are available in a wide variety of diverse colors, styles and designs.<br />Thanks<br /><a href="https://savingenergytech.com/products/" rel="nofollow">Outdoor garden lights</a><br /><a href="https://savingenergytech.com/decorative-2/" rel="nofollow">Custom made Decorative lighting</a><br /><a href="https://savingenergytech.com/products/" rel="nofollow">Custom Made Led Drivers Constant Current</a><br />Savingenergytechhttps://www.blogger.com/profile/00882364655751799139noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-18185635117466587502018-11-28T04:33:50.070-08:002018-11-28T04:33:50.070-08:00I am unable to read articles online very often, bu...I am unable to read articles online very often, but I’m glad I did today. This is very well written and your points are well-expressed. Please, don’t ever stop writing.<br /><a href="https://www.ukled.co.uk/led-drivers.html" rel="nofollow">LED Power supply</a><br />atif xhaikhhttps://www.blogger.com/profile/02930570824595079707noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-88232357283162882372018-07-04T05:48:23.175-07:002018-07-04T05:48:23.175-07:00useful information on topics that plenty are inter...useful information on topics that plenty are interested on for this wonderful post.Admiring the time and effort you put into your b!..<br /><a href="https://www.ukled.co.uk/led-drivers.html" rel="nofollow">LED Driver</a><br />atif xhaikhhttps://www.blogger.com/profile/02930570824595079707noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-37823773963581876042016-10-04T06:23:38.387-07:002016-10-04T06:23:38.387-07:00You say: "big disadvantage of C is that the l...You say: "big disadvantage of C is that the load (from the LED) is going through the resistor, so you do waste more power than in B and most importantly will have to use a high-watt (bulky, expensive, don't have it in your basement) resistor"<br /><br /> But there is only 0,065V on this resistor in all situations! For usual LED 20mA x 65mV = 0.0013W of lost power. (And you need resistor 0.065/0.02=3.25 ohm.)<br />Even if you need current 1A, it is 1x0.065=0.065W .<br />The smallest SMD resistor you can buy can survive this. (In this case you need resistor 0.065/1=0.065ohm. You probably can't buy such resistor and I am not sure if circuit based on such resistor would be stable enough, but definitely there is no problem with "bulky" resistor and big power loss. I like "C" version, because source voltage can be only about ?<0.5V? above the LED voltage.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-51984344904059944242013-08-14T08:14:36.784-07:002013-08-14T08:14:36.784-07:00LED light is giving more brightness than tradition...LED light is giving more brightness than traditional light with using so much little voltage.LED driverhttp://www.aceleds.comnoreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-76665792055517671552013-07-31T05:22:39.570-07:002013-07-31T05:22:39.570-07:00Well information of constant current LED driver. T...Well information of constant current LED driver. Thanks for sharing this article.Constant current driverhttp://www.aceleds.comnoreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-38473707288963035652013-07-17T23:28:39.206-07:002013-07-17T23:28:39.206-07:00Nice post. The photos you have shared this is most...Nice post. The photos you have shared this is most useful and helpful for a person. Thanks for sharing the information about constant current LED driver. I am collecting the information of LED driver. Last time I have visited:- www.aceleds.com for collecting information. They are also providing good information. Keep sharing the information.Anonymoushttps://www.blogger.com/profile/12850606139622889179noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-55028369054675674202011-06-29T11:48:38.098-07:002011-06-29T11:48:38.098-07:00Heh heh... you're right! Please ignore the im...Heh heh... you're right! Please ignore the image names. When I uploaded, I was planning a different order of presentation then what I finally settled on.<br /><br />That little light sculpture that introduces the article has been running about 50% of the time since 2009 (nightlight) by the way.Andrew Stonehttps://www.blogger.com/profile/04769383353032832222noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-86431091653481391892011-06-29T10:24:01.255-07:002011-06-29T10:24:01.255-07:00The name of the picture in section "b" i...The name of the picture in section "b" is 'LM334c.jpg' & the other one in section "c" is 'LM334b.jpg'. So which is which? :)<br />Other way, your post is quite interesting.dheadzhttps://www.blogger.com/profile/12469357090709584373noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-64172051487722902092010-12-16T13:12:02.990-08:002010-12-16T13:12:02.990-08:00I'm pretty confused by what you are doing here...I'm pretty confused by what you are doing here. I think you are trying to have a light turn on depending on the input of a variable resistor. But is there more to it than that?<br />Perhaps you can teach me something! A few points:<br /><br />1. LED Array:<br /> You have 5 series strings of 5 LEDs. These strings are in parallel. Putting these in parallel is dangerous as a small change in the voltage drop over one of the LED strings (as they age) will cause a divergence of the voltage drop across each parallel chain. This will result in the string with the lowest voltage drop sucking a disproportionate amount of current and potentially burn it out. Now you'll have 4 strings carrying the current of 5, so they will be over driven and burn out sooner -- and so on until all are dead.<br /><br />2. It looks like you are sending the entire current that is powering the LEDs through a light sensitive variable resistor. This might work... but why be that inefficient and require a bigger variable resistor?<br /><br />3. What's the point of Q1 on the left? Just having a Vbe voltage drop to match the Q1 on the right?Andrew Stonehttps://www.blogger.com/profile/04769383353032832222noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-1491765384499669982010-12-15T02:55:47.079-08:002010-12-15T02:55:47.079-08:00I am designing a light source for my company. I ha...I am designing a light source for my company. I have 5x5 array of leds. there are 5 branches, each branch has 5 leds.the branches are connected in parallel. hence 25 leds. each branch carries 0.06 A current. the following link shows the circuit I have designed for driving this array of leds. <br /><br />http://www.glowfoto.com/static_image/15-044438L/2333/jpg/12/2010/img4/glowfoto<br /><br />Is this circuit good enough.I want to know your comments on this. how stable and efficient is this circuit. Also I am trying to go for SMD components. I am not able find SMD package for TIP transistors. could you also draw me a circuit for this array of leds using LM 334.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-42512721363412897142010-07-08T00:04:47.699-07:002010-07-08T00:04:47.699-07:00Found this via a post on the Arduino forums. Very ...Found this via a post on the Arduino forums. Very helpful for brainstorming some ideas and understanding constant current circuits more clearly. Thanks!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-62419777502146995042010-07-07T08:09:59.790-07:002010-07-07T08:09:59.790-07:00I only used the LM317 in the more typical variable...I only used the LM317 in the more typical variable voltage regulator configuration. However you are right it is usable as a current regulator (check the spec).<br /><br />With the 317's greater amperage you would not have to use the power transistor as described above. However you do need a big high-watt resistor inline with your load so that the LM317 can sense the current.Andrew Stonehttps://www.blogger.com/profile/04769383353032832222noreply@blogger.comtag:blogger.com,1999:blog-824114889882641219.post-24321660552485576042010-07-06T06:57:52.275-07:002010-07-06T06:57:52.275-07:00could I use the LM317 instead of the LM334could I use the LM317 instead of the LM334Anonymousnoreply@blogger.com