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  • Joule Thief With Ultra Simple Control of Light Output

    Yes, thats what I hoped it would do. Sorry, Im not so good with transistors. Im more into leds, want to use this circuit for D-cell powered grave lights.So I whipped out my cheap little scope to see whats happening. I first turned the poti all the way down so it would act as a simple joule thief (right pic). At 1.2 V I get these wide peaks that are clipped at the led voltage. When I turn down the voltage to 0.8 V the peaks get very slim and the frequency goes up. So far so good.At 1.2 V I adjust the poti to medium brightnes. (The range of the poti where I can adjust the light is very small by the way.) This makes a step in the peaks at about 1.55 V. When I then turn down the supply voltage, again the peaks get slimmer, but the steps get smeared out and the frequency goes down.Very puzzl...

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    Yes, thats what I hoped it would do. Sorry, Im not so good with transistors. Im more into leds, want to use this circuit for D-cell powered grave lights.So I whipped out my cheap little scope to see whats happening. I first turned the poti all the way down so it would act as a simple joule thief (right pic). At 1.2 V I get these wide peaks that are clipped at the led voltage. When I turn down the voltage to 0.8 V the peaks get very slim and the frequency goes up. So far so good.At 1.2 V I adjust the poti to medium brightnes. (The range of the poti where I can adjust the light is very small by the way.) This makes a step in the peaks at about 1.55 V. When I then turn down the supply voltage, again the peaks get slimmer, but the steps get smeared out and the frequency goes down.Very puzzled here. Should I try different types of wire for the coils or a different number of windings?

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  • Joule Thief With Ultra Simple Control of Light Output

    I finally got my ferrite cores in the mail and the circuit works now. Thinking about it now the transformer core I used before probably did the opposite of what you want in this application. Anyway, I did some measurements. When I adjust the pito to about 2/3 output the circuit draws 1.55 mA at 0.8V, 3.68 mA at 1.1 V and 6.65 mA at 1.5 V. So the characteristic is the same as the simple circuit. I was hoping to get a more constant output over the battery life. Any Idea how this could be achieved?

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  • Joule Thief With Ultra Simple Control of Light Output

    Thanks for the detailed reply. I will try it with a ferrite core. I had lots of these from RC speed controllers and I always threw them out.The schematics are fine, when you click on them the whole thing is shown.When I turn down the poti so Q2 has 0 V at the gate it basically becomes the simple Joule thief circuit. But I will try to build the simple one if all else fails.One thing I was confused about is the direction of the winding. The two windings go in oposite direction, right?

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  • Joule Thief With Ultra Simple Control of Light Output

    Cant get this circuit to work. For the core I used core from a small transformer instead of a ferrite ring. Wound it with copper laquer wire. The poti is a 100k and the small cap is 2.2 uF. Everything else is exactly as described. It doesnt seem to oscillate. Output voltage is the same as input. Changing the poti I can adjust the base voltage of Q2 and therefore the base voltage of Q1 changes but nothing else happens.

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  • woerldedit commented on GuhanN's instructable Growing Crystals!1 year ago
    Growing Crystals!

    I tried it with sugar but it quickly developed mold. You could stop that with a lid but then it might start fermenting and building up pressure.

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  • woerldedit made the instructable Arduino Laser Engraver Wood Design!1 year ago
    Arduino Laser Engraver Wood Design!

    I bought 22 for the laser and 26 for the motors. I think 22 is enough, the 26 might be on the small side. There are a lot of charts out there bot they all differ because it depends on how hot you want your wires to be.Another thing is you need flexible wired for the moving parts. What you want is silikone insulated copper wires with small strands. In the electronics compartment I use stiffer and cheaper wire.Down in the base (my x-axis) i use a cable chain to keep everything tidy and on the top (y-axis) I use plastic cable wrap so the bending radius is bigger.

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  • woerldedit commented on MichielD99's instructable Arduino Laser Engraver Wood Design!1 year ago
    Arduino Laser Engraver Wood Design!

    I hooked up one motor for testing and followed your software steps. I included grbl and uploaded it sucessfully. But in the serial monitor I only got the following message no matter what I type in:Grbl 0.9j ['$' for help]error: Expected command letterI am using an Arduino Uno. This is my second Arduino project. The first one failed and it seems like this one is going to fail as well. Very frustrating!

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  • woerldedit commented on MichielD99's instructable Arduino Laser Engraver Wood Design!2 years ago
    Arduino Laser Engraver Wood Design!

    I have a question about the shaft couplers. You are using flexibel ones but unfortunately my axes dont run very smooth. I am worried that the couplers will introduce a lot of slack when the screws have to apply a decent amount of force. My motor controllers have not arrived yet, so I cant test it.

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