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Colin Richardson
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Not really Arduino but circuits in general. I am making a small set of lights for a table centre piece for my wedding. It only needs to last a few hours. But I didn't know if I am doing this all wrong with terms of the resister and battery in series? Purple LED's are 3.3v, Red LEDs are 2v. All running at 20mA, I've split up the batteries into 2 parts for sizing issues but don't know if order matters? I couldn't see why since they are in series within their housing anyway, but wanted to check. And I personally couldn't think of a way of getting a nice way of getting a larger number of LED's on the voltages I had. I only have 10 purple LEDs. Any suggestions are welcome.
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I am making a small set of lights for a table centre piece for my wedding. It only needs to last a few hours. But I didn't know if I am doing this all wrong with terms of the resister and battery in series? Purple LED's are 3.3v, Red LEDs are 2v. All running at 20mA, I've split up the batteries into 2 parts for sizing issues but don't know if order matters? I couldn't see why since they are in series within their housing anyway, but wanted to check. And I personally couldn't think of a way of getting a nice way of getting a larger number of LED's on the voltages I had. I only have 10 purple LEDs. Any suggestions are welcome.
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When buying a Benchtop power supply, if it says it can do 30v 3a. Obviously that means at 30volts it can supply 3amps. But is it limited to 3amps for all voltages too? So even at 12volts, I am limited to 3 amps? Or could I get 7.5amps ? since that is still within the 90watt rating?

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Not really top news or anything fancy, but I just finished my first custom built cable. Though I have yet to shrink the heat shrink. I just wanted to be a little proud of it. 
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Not really top news or anything fancy, but I just finished my first custom built cable. Though I have yet to shrink the heat shrink. I just wanted to be a little proud of it.
Photo

I do apologise if I use the term array here wrong, or if what I am after does not exist but I am looking for a Transistor Array that has a Common Collector, and a Transistor Array that has a Common Emitter.
My current setup has 18 transistors (7+9), and they take up far too much space. Looking for a space saving design and having a IC or something like this would be wonderful. Though I know I would need a 16pin and 20pin. If I am using the wrong terms or any tips would be much appreciated.

I do apologise if I use the term array here wrong, or if what I am after does not exist but I am looking for a Transistor Array that has a Common Collector, and a Transistor Array that has a Common Emitter.
My current setup has 18 transistors (7+9), and they take up far too much space. Looking for a space saving design and having a IC or something like this would be wonderful. Though I know I would need a 16pin and 20pin. If I am using the wrong terms or any tips would be much appreciated.

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