8/15/2023 0 Comments Lm317 icircuitQ5: how to correctly calculate the resistors on the transistor pin > Arduino pins to ensure proper saturation/opening of Looks reasonable, but I would have to read a data sheet on the regulator device to see if R4 is properly sized, and I'm feeling to mellow at the moment to bother. Q4: parts I have chosen look acceptable/correct? The constant current regulator will automatically adjust whatever output voltage is required by the led section to maintain the designed constant set current. You could ground the output terminal of the regulator and it would still maintain a steady current to ground. Q3: (stupid one I know.but) What is the voltage going to the LEDS now in the configuration? (not sure how the voltage isĪgain the voltage is not being regulated rather the current. No problem at all, as your regulator is wired as a constant current device it will regulate to the desired current no matter what the forward voltage drop rating is to any of the three color led sections. Q2: how do I handle the RED channel/die in the led? (lower vF?) Yes, if you are only going to command one color (or none) at a time then your circuit should work. Pricing and Availability on millions of electronic components from Digi-Key Electronics. LM317DCYR – Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A SOT-223-4 from Texas Instruments. LM317CYR Digi-Key Electronics LM317DCYR | Digi-Key Electronics LM317 I have found, asking for second 'eyes' if these are correct/acceptable? how do I calculate theĬorrect value for those resistors? to ensure foll saturation/openness of the transistor(s)? Information, Voltage Regulator Calculator and Circuits / Schematics for the LM317 / LM338 / LM350 family of 3-Terminal Adjustable Voltage Regulators. will only be 'blinked.never -on- for any 'length' of time (used for muzzle flash for gun prop)Ĭalculate resistor value: LM317 / LM338 / LM350 Voltage Regulator Calculator and Circuits.no color mixing (1 channel on at a time).high current RGB LED star (RGB in question.the notoriously 'backwards' labeled DealExtreme 3W RGB star:.NEW post including question summary at end: (posting here to maybe help you get the details/fine points easier than digging through my trial & error process! LOL) (I have asked Nick Gammon to nuke this thread due to the dead-air and bad. maybe there are still other flaws? (I have a list of 5 questions at the end of the summary!) lol this text file gets parsed.and then uses the appropriate color (pin) for the events in the sketch. where they can set either R, G or B as one of the values for a default. the user has a config file located on an SD card. To be more clear and give some background. I have a new post ready to go so this one with all the BAD schematics wont lead someone down the wrong path.ġ.) its not designed or intended to be used with multiple colors, or more than one channel on at a time (but if so, which it wont.wouldnt it just be a dim 'color'?) HI Retrofly - (thanks for the reply.was beginning to think it was a dead thread) I know there are 2-3 posts to catch up on.so thanks to anyone around & Chagrin as well I would just adjust the resistor to be a bit more than on the Green & Blue dies.īut in a 'constant current' set-up? Im not sure how this should be approached? simple digital on/off)īeing new to all this constant current circuit design stuff.how do I accommodate for the RED die having a lower fV (forward voltage) requirement than the other dies/colors? and then depending what pin/transistor I will use that DIE on the LED? (there will no color mixing, ie: not more than 1 transistor open at any given time, these are not hooked up to PWM enabled pins. The VOUT from the LM317 still goes to the 'transistors'. Is this the correct approach? same as before but with an LM317 as constant current instead of LM7805 as voltage regulator?. Since I only want one color/channel in use at any given time.
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