SRC Member briareos Posted March 26, 2006 SRC Member Share Posted March 26, 2006 I'm interested to DIY a moonlight with blue LEDs. Suppose I get 10 blue LEDs, and I have a 12v power supply. How do I calculate the resistor value to use, and do I connect the LEDs in series or parallel? Quote Link to comment Share on other sites More sharing options...
SRC Member Tanga Posted March 26, 2006 SRC Member Share Posted March 26, 2006 Bro DIY set sold at SLT for $20 they comes with manual and everything Quote Link to comment Share on other sites More sharing options...
SRC Member Maxstar81 Posted March 26, 2006 SRC Member Share Posted March 26, 2006 Get the pre-fixed set. Just need connect to adapter can use liao. Quote Link to comment Share on other sites More sharing options...
zoren Posted March 26, 2006 Share Posted March 26, 2006 er, wats SLT ? Quote Link to comment Share on other sites More sharing options...
etnies Posted March 26, 2006 Share Posted March 26, 2006 Sim Lim Tower Quote Link to comment Share on other sites More sharing options...
SRC Member d88p Posted March 26, 2006 SRC Member Share Posted March 26, 2006 any idea which shop is it? Quote Link to comment Share on other sites More sharing options...
SRC Member Oceandeep Posted March 26, 2006 SRC Member Share Posted March 26, 2006 u need to measure the volt from the adpator first. Quote Link to comment Share on other sites More sharing options...
SRC Member Oceandeep Posted March 26, 2006 SRC Member Share Posted March 26, 2006 then base on 1 blue led need 3 volt, calculate how many led u need. connect them in series... Quote Link to comment Share on other sites More sharing options...
SRC Member ah_d3x Posted March 28, 2006 SRC Member Share Posted March 28, 2006 u should connect them in parallel cause even if one blows the others still can work... if in series circuit one blows means all cannot light up liao. Quote Link to comment Share on other sites More sharing options...
SRC Member Oceandeep Posted March 28, 2006 SRC Member Share Posted March 28, 2006 LED wouldnt blow so easily. As long as the current and volt is within limit. Quote Link to comment Share on other sites More sharing options...
SRC Member cdckjn Posted March 29, 2006 SRC Member Share Posted March 29, 2006 I hope that this helps, this is confirmed after some discussion with a vendor at the electronics shop at Sim Lim Tower. The price of the LEDs will drop when you purchase in bulk (30-100pcs for example) but for most of us, 10 LEDs is already a lot (nano or pico tank). Happy DIYing. LED_connection.doc Quote Link to comment Share on other sites More sharing options...
SRC Member briareos Posted March 29, 2006 Author SRC Member Share Posted March 29, 2006 How much are normal blue LEDs? I remember last time they cost a lot more than the red ones. Quote Link to comment Share on other sites More sharing options...
SRC Member briareos Posted April 1, 2006 Author SRC Member Share Posted April 1, 2006 Ok, need help here boys. I went to SLT and they had 2 kinds of blue LEDs - 4.5v and 6v. I got 9 4.5v types, and 3 120 ohm resistors. Can I wire these according to the diagram given on page 1, and connect it to a 9v PSU? Or do I need a 6v PSU for it now? Quote Link to comment Share on other sites More sharing options...
SRC Member Bernard Posted April 4, 2006 SRC Member Share Posted April 4, 2006 I hope that this helps, this is confirmed after some discussion with a vendor at the electronics shop at Sim Lim Tower. The price of the LEDs will drop when you purchase in bulk (30-100pcs for example) but for most of us, 10 LEDs is already a lot (nano or pico tank). Happy DIYing. MAy I check with you if there's any directional for the resistor and is there any positive and nagative for the LED? Planing to DIY but not sure about electronic. Thanks. Quote Link to comment Share on other sites More sharing options...
SRC Member cdckjn Posted April 4, 2006 SRC Member Share Posted April 4, 2006 Ok, need help here boys. I went to SLT and they had 2 kinds of blue LEDs - 4.5v and 6v. I got 9 4.5v types, and 3 120 ohm resistors. Can I wire these according to the diagram given on page 1, and connect it to a 9v PSU? Or do I need a 6v PSU for it now? Yes, just follow the circuit diagram and it should be fine. Yes also to you LED has a positive and negative, how you identify is that if you observer closely, the LED is round but there is a little flat part, the flat part is the thick black line (the LED symbol), the other way to confirm is to solder wires to the LED then use a 9V (if yours is a 4.5V) then just tap to test if it lights up (of course positive to negative of the battery), in this way, you can confirm the setup. Happy DIYing. Quote Link to comment Share on other sites More sharing options...
firestream Posted April 5, 2006 Share Posted April 5, 2006 I wonder anyone try the 1 watts blue LED .. The viewing Angle: 140 Degree, which look more like a moon light .. http://www.besthongkong.com/product_info.p...052a5639df2dc74 Quote Link to comment Share on other sites More sharing options...
SRC Member Bernard Posted April 5, 2006 SRC Member Share Posted April 5, 2006 Yes, just follow the circuit diagram and it should be fine. Yes also to you LED has a positive and negative, how you identify is that if you observer closely, the LED is round but there is a little flat part, the flat part is the thick black line (the LED symbol), the other way to confirm is to solder wires to the LED then use a 9V (if yours is a 4.5V) then just tap to test if it lights up (of course positive to negative of the battery), in this way, you can confirm the setup. Happy DIYing. Thanks great info. Now have to figure out how to lay out the LED to make it evenly shine in the tank. Quote Link to comment Share on other sites More sharing options...
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