6 x 5mm LED Strip Light 24V
Description
This is my first upload, and is subject to being updated. I couldn't find a suitable 5mm LED strip light model, for my Prusa Lack enclosure. So I modeled my own. It consists of three parts, the LED holder, which must be transparent. The rear cover for it, and a cover for the electronics. To ensure a fixed current of ~28mA through the led strip, I made a small circuit using an LM317 regulator in fixed current mode. To save space, I used a TO-92 packaged LM317 from Texas instruments - it's practically indestructible and can supply up to 100mA, limited by power dissipation that is related to the voltage drop over it and current through it. The circuit is simple, using two 22 Ohm resistors (I had no 47 Ohm left, so made do with 2 x 22 Ohm in series), you connect the output from the LM317 to the Adj pin. From there, the positive for the strip of 6 LEDs in series (~3.2V drop over each) is connected to the Adj pin (or Output after the resistors), with the negative to ground. This was designed for a 24V supply - in order to use it with a 12V supply, you must use less LED's, or create another parallel strip of LEDs - google is your friend. You can get a little bit more clever and use an additional POT in series with the resistors to create a dimmer - as long as it can handle ~28mA. Something I'll retrofit later, and will upload a control box with switch model once I've got round to it. I'd also recommend you add a fuse - I have created my own separate 24V protected line, hence why I haven't. I'll upload a circuit diagram for those not entire comfortable with it. The RS Component part No for the LED's I used is: 810-6702
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