serpa4
Newbie level 3
Hello. First time here and posting.
I purchased an LED array to use in place of my incandescent light bulbs in my motor home. The incandescent lights use 1.5 amps each and the LED array only used 150 milliamps. Here is a description of the array:
25 led High Powered SMT Array Outfitted with 25 of the latest SMT High Powered LEDs. Designed especially for overhead lighting & angled sockets & applications requiring a lot of light.
Flexible wires to base allows the to be adjusted to any angle
25 Led array measures 38mm x 38mm x 10mm thick
The problem with LEDs in motor homes is that they are either:
1) Not bright enough
2) Too blue in color
3) Short lived due to high charge rates of the batteries. My on board charger will put out up to 14.5 - 15 volts.
I have found this array to be white and bright, but it’s not regulated. I have looked at a lot of 3-pin 12vdc regulators online, but most have a very high drop out voltage, like 1 to 1.5 volts. This doesn’t work since I often see 11 volts or sometimes 10.8 with very low batteries while camping. Then you throw in the voltage drop, and the LEDs are extremely dim or don’t light at lower voltages due to dropout. This LED array does work fine at 10.5 volts and is pretty bright.
I think this project would be exactly what I need.
http://www.drbob.net/project/powersupply/linear/12v1alvdfxd/index.html
It’s a 12 volt regulator with only .1 volt drop. So, even with a dead battery of 10.8 volts, the led with the regulator’s dropout voltage (.1volts) would leave the array with 10.7 volts. I have tested the array at 10.7 volts and it works fine and is still bright. I need the regulator to be small to fit inside the lamp enclosure in my motor home. It took me 2 days to figure out what 12vdc regulator I needed (didn’t work). I know nothing about electronics at all. I don’t know how to read the diagram or what parts to buy since I don’t even know what they do. Please help if possible. For example, the schematic shows a LM324 with 3 lines coming out of it. I looked at the schematic for the LM324A and it shows 14 pins. I have no clue on how to wire this. What is + and what is - and what is the line coming out of the point of the LM324 schematic? Then there is another triangle in the center of the regulator schematic and I don’t know what that is or how to wire it. There is also an IRF9520 in the regulator schematic. I looked at the data sheet on an IRF 9520 and it shows a D/G/S. I don’t know what goes to Gate, Source, and Drain. Can someone tell me something like the “drain goes to R5 (3.3K resistor) or what ever? I cannot find a 25uF 16WV anywhere on line. Where would I get one? Also, the parts list and schematic doesn’t match. The schematic shows a 25uF 16WV capacitor but it is not listed on the parts list. The parts list shows a 25 uF 50WV electrolytic capacitor but it isn’t show on the schematic.
Anyone have a minute to tell me how to build this item? It would greatly help me. Thank you.
I have a bread board, multi meter, and a variable DC power supply. I have very very basic knowledge on electronics.
Links:
LED array (25 led High Powered SMT Array - Outfitted with 25 of the latest SMT High Powered LEDs )
http://autolumination.com/otherleds.htm
Dr Bob’s project: Low dropout voltage regulator. His email is not working.
http://www.drbob.net/project/powersupply/linear/12v1alvdfxd/index.html
I purchased an LED array to use in place of my incandescent light bulbs in my motor home. The incandescent lights use 1.5 amps each and the LED array only used 150 milliamps. Here is a description of the array:
25 led High Powered SMT Array Outfitted with 25 of the latest SMT High Powered LEDs. Designed especially for overhead lighting & angled sockets & applications requiring a lot of light.
Flexible wires to base allows the to be adjusted to any angle
25 Led array measures 38mm x 38mm x 10mm thick
The problem with LEDs in motor homes is that they are either:
1) Not bright enough
2) Too blue in color
3) Short lived due to high charge rates of the batteries. My on board charger will put out up to 14.5 - 15 volts.
I have found this array to be white and bright, but it’s not regulated. I have looked at a lot of 3-pin 12vdc regulators online, but most have a very high drop out voltage, like 1 to 1.5 volts. This doesn’t work since I often see 11 volts or sometimes 10.8 with very low batteries while camping. Then you throw in the voltage drop, and the LEDs are extremely dim or don’t light at lower voltages due to dropout. This LED array does work fine at 10.5 volts and is pretty bright.
I think this project would be exactly what I need.
http://www.drbob.net/project/powersupply/linear/12v1alvdfxd/index.html
It’s a 12 volt regulator with only .1 volt drop. So, even with a dead battery of 10.8 volts, the led with the regulator’s dropout voltage (.1volts) would leave the array with 10.7 volts. I have tested the array at 10.7 volts and it works fine and is still bright. I need the regulator to be small to fit inside the lamp enclosure in my motor home. It took me 2 days to figure out what 12vdc regulator I needed (didn’t work). I know nothing about electronics at all. I don’t know how to read the diagram or what parts to buy since I don’t even know what they do. Please help if possible. For example, the schematic shows a LM324 with 3 lines coming out of it. I looked at the schematic for the LM324A and it shows 14 pins. I have no clue on how to wire this. What is + and what is - and what is the line coming out of the point of the LM324 schematic? Then there is another triangle in the center of the regulator schematic and I don’t know what that is or how to wire it. There is also an IRF9520 in the regulator schematic. I looked at the data sheet on an IRF 9520 and it shows a D/G/S. I don’t know what goes to Gate, Source, and Drain. Can someone tell me something like the “drain goes to R5 (3.3K resistor) or what ever? I cannot find a 25uF 16WV anywhere on line. Where would I get one? Also, the parts list and schematic doesn’t match. The schematic shows a 25uF 16WV capacitor but it is not listed on the parts list. The parts list shows a 25 uF 50WV electrolytic capacitor but it isn’t show on the schematic.
Anyone have a minute to tell me how to build this item? It would greatly help me. Thank you.
I have a bread board, multi meter, and a variable DC power supply. I have very very basic knowledge on electronics.
Links:
LED array (25 led High Powered SMT Array - Outfitted with 25 of the latest SMT High Powered LEDs )
http://autolumination.com/otherleds.htm
Dr Bob’s project: Low dropout voltage regulator. His email is not working.
http://www.drbob.net/project/powersupply/linear/12v1alvdfxd/index.html