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  • Yet Another Simple Pot-controlled 555 PWM generator

    Got this working, with asspumtion they print north to south, with assumption pin 7 comes in at same point as r1 off +.Too many wires. But I can't see a breadboard working with a 555 as pin spacing is 1.25m, while bread board is 2.5mm. http://www.intersil.com/content/dam/Intersil/docum...Either I am wrong with bb spec, or my 555 is wrong brand.

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  • Yet Another Simple Pot-controlled 555 PWM generator

    Of course, I will go with the detailed diagram over rough. Trial and error and google on the diode/cap. However, I don't want to trial and error pot hookup. This pot hookup needs explanation of what is actual hookup, described by the three arrows pointing into r2.

    My 555 that arrived looks nothing like the wikipedia, where there is a dot or two in the north side. How are we supposed to figure out the north south orientation of the 555 without burning out the chip, if it doesn't look like the wikipedia picture? There is random number on it too small to read. I could assume they would print north to south. Or I could assume they would print south to north.

    Also, on rough schematic, what does 2 cw refer to?

    I haven't yet built, but studied with microscope the laid out schematic.Firstly, I do not yet understand the pot hookup. Most pots have three pins. I assume only two to be tapped, not three. But assuming as nothing mentioned in diagrams. Now assuming only two pins the Vs through R1 and pin 7 go into center pin of the pot, while third pin of the pot goes to r3. ?????????????????Also, I find the schematic a mere jumping off point for a physical diagram, which takes another half hour to draw out. On an actual diagram, I see these pins shorted together: 8:4 , 5:2 and 7 to 6 via Diode. If I am right, 7 and 8 are shorted through r1. And 7 and 5 are shorted/connected through pot and r3. And 5 and 1 through the capacitor.Not having built circuits recently, I am also going cold on diod...

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    I haven't yet built, but studied with microscope the laid out schematic.Firstly, I do not yet understand the pot hookup. Most pots have three pins. I assume only two to be tapped, not three. But assuming as nothing mentioned in diagrams. Now assuming only two pins the Vs through R1 and pin 7 go into center pin of the pot, while third pin of the pot goes to r3. ?????????????????Also, I find the schematic a mere jumping off point for a physical diagram, which takes another half hour to draw out. On an actual diagram, I see these pins shorted together: 8:4 , 5:2 and 7 to 6 via Diode. If I am right, 7 and 8 are shorted through r1. And 7 and 5 are shorted/connected through pot and r3. And 5 and 1 through the capacitor.Not having built circuits recently, I am also going cold on diode and cap orientation. Hope it is obvious, when building.

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  • Very simple PWM with 555...Modulate every thing

    Is there a better explanation somewhere. The diagram of the 555, doesn't line up with the real chip, so is confusing as hell to 99 out of 100 people!!!!! Then, you don't use the standard symbol for a potentiometer. Where is your pot? Then, no simple summary for beginners: of what capacitor goes where: between what pin and which battery poll...Also, a more flashlightaholics know the 555 should be controlling one amc7135 (10 cent chip), which should regulate a newer 225 lumen per watt Souel white led, or a 202 lpw Cree xp-l v6 led. The leds you choose are 20 lumen per watt, and aren't current constant, independent of the battery voltage. The amc is one watt or 340 milliamps. the amc needs the 555 for dimming. ...Also, no mention of heatsinking anything. Does the 555 need heatsinkin...

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    Is there a better explanation somewhere. The diagram of the 555, doesn't line up with the real chip, so is confusing as hell to 99 out of 100 people!!!!! Then, you don't use the standard symbol for a potentiometer. Where is your pot? Then, no simple summary for beginners: of what capacitor goes where: between what pin and which battery poll...Also, a more flashlightaholics know the 555 should be controlling one amc7135 (10 cent chip), which should regulate a newer 225 lumen per watt Souel white led, or a 202 lpw Cree xp-l v6 led. The leds you choose are 20 lumen per watt, and aren't current constant, independent of the battery voltage. The amc is one watt or 340 milliamps. the amc needs the 555 for dimming. ...Also, no mention of heatsinking anything. Does the 555 need heatsinking? All leds need heat sinking, as does the amc's need 5 sq cm. Most flashlights run too many amcs and don't heatsink. Also, still chasing the 100 lumen per watt setups, rather than 200 lumen per watt setup. And so there is a need to make our own controllers. Will take more research to figure out the wiring, as this page falls short and needs an update.

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