I can't tell from the soldering, lol. What kind of battery are you using?
If you connect LEDS in Parallel (Pluses to Pluses/Minus' to Minus') you are still going to need a resistor UNLESS you connect 2 of them in series, which makes 7 Volts for each pair(the DVX battery 7.5V), then you can connect as many pairs as you need. The resistor does needs to limit the Voltage. You are applying 7.5V to a 3.5V LED, thats why they are popping. If you want to connect all the LEDs together in parallel then here is a formulla for which resistor to get.
Asuming these LEDs draw 20mA, you will need a resistor to handle 4V(Since 3.5 volts is needed for the LEDs and your Battery is 7.5V then 7.5V-3.5V = 4 V)
30 LEDS = 20mA Draw Each x 30 = Total Current Draw of 600mA
Ohms Law
Voltage(V) = Current(I) x Resistance(R)
4V = 600 X R
Since 600mA you need to convert to Amps Divide by 1000
4V= .6 X R
SOLVE = 6.66 Ohm Resistor
P = Voltage(V) x Current(I)
P = 4V X .6A
P = 2.4 Watt
So you Will need a 6.66 Ohm Resistor Rated at 2.4 Watts, but double the wattage to be safe, so about a 6.66 Ohm resistor rated at 5 watts.
Now you can connect all the LEDs in Prarallel and and then connect the resistor in series and it should work with 30 LEDs. Make sure if you change the Battery and the voltage is different it has to be calculated again. Same goes for the Number of LEDs you have to find the total current if you add more LEDs.
Phew that took long, hope it helps, you can calculate the correct resistor value with the steps above for any type of LED setup you do.
If you connect LEDS in Parallel (Pluses to Pluses/Minus' to Minus') you are still going to need a resistor UNLESS you connect 2 of them in series, which makes 7 Volts for each pair(the DVX battery 7.5V), then you can connect as many pairs as you need. The resistor does needs to limit the Voltage. You are applying 7.5V to a 3.5V LED, thats why they are popping. If you want to connect all the LEDs together in parallel then here is a formulla for which resistor to get.
Asuming these LEDs draw 20mA, you will need a resistor to handle 4V(Since 3.5 volts is needed for the LEDs and your Battery is 7.5V then 7.5V-3.5V = 4 V)
30 LEDS = 20mA Draw Each x 30 = Total Current Draw of 600mA
Ohms Law
Voltage(V) = Current(I) x Resistance(R)
4V = 600 X R
Since 600mA you need to convert to Amps Divide by 1000
4V= .6 X R
SOLVE = 6.66 Ohm Resistor
P = Voltage(V) x Current(I)
P = 4V X .6A
P = 2.4 Watt
So you Will need a 6.66 Ohm Resistor Rated at 2.4 Watts, but double the wattage to be safe, so about a 6.66 Ohm resistor rated at 5 watts.
Now you can connect all the LEDs in Prarallel and and then connect the resistor in series and it should work with 30 LEDs. Make sure if you change the Battery and the voltage is different it has to be calculated again. Same goes for the Number of LEDs you have to find the total current if you add more LEDs.
Phew that took long, hope it helps, you can calculate the correct resistor value with the steps above for any type of LED setup you do.
idvfilms
Well-known member
I finally got around to whipping one of these up. It is super ghetto! as I used no solder (twistytied) since I am just testing. I do have a question I have 28 LED's on the projekt board and I am using a 9 volt which started to get extemely hot! can any one explain why this might happen?
I have gone over the data here thrice over but no avail.
I also have a Lenmar plate but I would only get a flash out of it and it would be over. So I am mis firing somewhere but I know I am close?
I also rigged a on/off switch and ran my test board to 3 triple A batteries and had o.k. results, switch works great just not enough output.
I got a couple of 10kohm resistors lying around I am not sure where to place 'em?
So to break it down I have found various ways of powering just not correctly. I also would perfer to use the Pany bat. as I do not want to have to rig a 9/volt and carry more around as most of my shooting is run and gun.
If anyone is still out there on this and can assist I would be thankful!
Or just email me,
Aloha
I have gone over the data here thrice over but no avail.
I also have a Lenmar plate but I would only get a flash out of it and it would be over. So I am mis firing somewhere but I know I am close?
I also rigged a on/off switch and ran my test board to 3 triple A batteries and had o.k. results, switch works great just not enough output.
I got a couple of 10kohm resistors lying around I am not sure where to place 'em?
So to break it down I have found various ways of powering just not correctly. I also would perfer to use the Pany bat. as I do not want to have to rig a 9/volt and carry more around as most of my shooting is run and gun.
If anyone is still out there on this and can assist I would be thankful!
Or just email me,
Aloha
vidled
DVXuser Sponsor
idvfilms said:
Hey.
Good stuff. The drain on the 9V is probably WAY too high, hence it will get hot. Alkaline and Lithium 9V batteries aren't very good for high-drain applications, NiCD and NiMH fare better, but considering the size of the cell (remember they need 7 or sometimes 8 cells to get to 9V [8.4V vs. 9.6V nominal rechargeables]) the 9V battery just can't handle a good drain!
One way to solve the problem would be to use a different battery, or if you really wanted to use 9V batteries, you could try a clip where you can combine two 9V batteries together. We sell them too, and they look like this:
Cheers,
Marius
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Justyn
Veteran
This is an amazing thread. Anyone making them for sale yet? Or could I get a detailed set of plans and list of websites and products. I like those litepanels so much.. but so damn expensive. If someone could produce one of these with a battery in the 200 range, they'd have a nice hit here... or atleast help us out with the plans and gentle guidance.
Justyn
Veteran
I think these are awesome: http://vidled.com/
Anyone bought these? Marius seems like a cool guy and the price is really nice. I especially dig the battery options here.
Thanks all
Anyone bought these? Marius seems like a cool guy and the price is really nice. I especially dig the battery options here.
Thanks all
lewkmiller
New member
http://www.superbrightleds.com/index.htm
I don't know if this has been posted before but looks like a good place for DIYers.
I don't know if this has been posted before but looks like a good place for DIYers.
Matt Gottshalk
Resident Preditor
I have multiple VIDleds from them and they are worth every penny!
Cool Lights
DVXuser Sponsor
Based on previous discussions about mounting one of these DIY LED solutions, here's a part that I think can help a lot. A really inexpensive hot shoe mount ($9.99 ea). So you can do it the right way with one of these and not worry about damaging the camera.
http://www.markertek.com/Product.as...subcat=&prodClass=LCDMOUNTS&mfg=&search=0&off=
Just need a 1/4-20 threaded hole on your DIY LED solution and you can put it on your camera in a super pro way.
http://www.markertek.com/Product.as...subcat=&prodClass=LCDMOUNTS&mfg=&search=0&off=
Just need a 1/4-20 threaded hole on your DIY LED solution and you can put it on your camera in a super pro way.