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taki2007

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  • DIY Non Contact IR Thermometer V1.0

    (Moreover, the Arduino steps it down to 5V through a linear regulator so it is wasted anyway?)

    Why do you step the voltage up to 7V? The arduino needs only 5V, which the TP4056 already provides (with over discharge protection) with a stable value, if I'm not mistaken?

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  • Location Tracking "Weasley Clock"

    Yeah, "I read it in 'Hogwarts: A History'", thanks a lot, Hermione 😉On a more Potterhead-compatible note and even trying to stick to the in-universe logic, I really don't get why they did not have a widespread use of something as useful as the telephone (in a magical version, I mean). Of course they can use fireplaces as a Skype, but why does it seem so f'ing complex to use ? Maybe because Hogwarts is a strict kind of boarding school like the kind where kids are not supposed to phone home, in order to harden them a bit?Real life answer: JKR did not have her world building planned ahead that much, so some later things, meant to impress the Muggle reader, really are OP compared to earlier events in the books. Like apparating is OP compared to flying on a broomstick, or compared to…

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    Yeah, "I read it in 'Hogwarts: A History'", thanks a lot, Hermione 😉On a more Potterhead-compatible note and even trying to stick to the in-universe logic, I really don't get why they did not have a widespread use of something as useful as the telephone (in a magical version, I mean). Of course they can use fireplaces as a Skype, but why does it seem so f'ing complex to use ? Maybe because Hogwarts is a strict kind of boarding school like the kind where kids are not supposed to phone home, in order to harden them a bit?Real life answer: JKR did not have her world building planned ahead that much, so some later things, meant to impress the Muggle reader, really are OP compared to earlier events in the books. Like apparating is OP compared to flying on a broomstick, or compared to the floo network, so she had to later ret-con restrictions about these things, and add rules in an unconvincing "A wizard did it"-way 😄. Or inversely like the Laws of Transfiguration (as in, laws of physics) telling that you cannot really create food (wonder why you could not roast an unanimated object you justtransformed into an animal... 😜) are there to nerf things that were set up in the earlier books, and that people pointed out that there should be no conflict in a world where you can conjure (almost) anything out of thin air

    Can't understand why no-one at the Ministry of Magic thought of making a magical Weasley Clock with Voldy's name on it, pointing to very precise locations (like coordinates). But then again, we are talking about people who use birds to communicate even urgent stuff, when the muggle world invented the telephone...

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  • Audio Mixer - Two Devices Into One Headphones

    For the stereo version, dual potentiometers are not even required, just use one normal pot per L/R channel: this way you get a "free" balance option on your device ("it's not a bug, it's a feature" 😜)

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  • taki2007 commented on NEW PEW's instructable Simple Flip Flop Circuit
    Simple Flip Flop Circuit

    Just adapt the 1k resistors value so as to limit the LED's current (rule of thumb makes me say, 1.5k should be OK). And check the voltage rating for the capacitors and transistors is over 12V (OK for BC547 transistors, but double check for the capacitors since 6.3V do exist. I would suggest to go for 25V rated capacitors.)

    You can do this by daisy-chaining each "half" of the circuit (that is, one 1k resistor, the transistor to which it is connected, the LED, the 10k resistor connected to the transistor's base, and the capacitor going from its collector to the other transistors base). Intead of looping the 2nd "half circuit"'s capacitor back to the 1st transistor's base, just connect it to a third transistor in the same configuration (the one I described in brackets). And so on, the capacitor going from T3's collector should be connected to T4's base; when you got the number you like, just loop it back to T1's base. I don't think there is a theoretical limit to that, since every elementary circuit is working in parallel. It makes a kind of no-IC LED chaserWhen I did that with 3 transistor…

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    You can do this by daisy-chaining each "half" of the circuit (that is, one 1k resistor, the transistor to which it is connected, the LED, the 10k resistor connected to the transistor's base, and the capacitor going from its collector to the other transistors base). Intead of looping the 2nd "half circuit"'s capacitor back to the 1st transistor's base, just connect it to a third transistor in the same configuration (the one I described in brackets). And so on, the capacitor going from T3's collector should be connected to T4's base; when you got the number you like, just loop it back to T1's base. I don't think there is a theoretical limit to that, since every elementary circuit is working in parallel. It makes a kind of no-IC LED chaserWhen I did that with 3 transistors, I noticed it would sometimes get stuck in one state at power-on, so I also added a push-button in parallel with one of the capacitors (which one does not matter) to "jump start" the oscillation.

    Actually the power for the LEDs is NOT stored in the capacitors. It is supplied on demand by the 9V power supply when the transistor is "closed" (in saturation mode). The 2x"capacitor+10K resistor" are 2 R-C oscillators that trigger the transistors "on" or "off". Provided you chose the transistor appropriately (base/emitter current vs collector/emitter current when saturated), the power rating of the 10k resistor and of the capacitor is irrelevant.BTW the circuit in this instructable is not state of the art for transistor circuits... LEDs should be in the same circuit branches as 1k resistors, so as to minimize base/emitter current. This is true with NPN and PNP transistors (but with reversed emitter and collector positions).So to respond to O.P., y…

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    Actually the power for the LEDs is NOT stored in the capacitors. It is supplied on demand by the 9V power supply when the transistor is "closed" (in saturation mode). The 2x"capacitor+10K resistor" are 2 R-C oscillators that trigger the transistors "on" or "off". Provided you chose the transistor appropriately (base/emitter current vs collector/emitter current when saturated), the power rating of the 10k resistor and of the capacitor is irrelevant.BTW the circuit in this instructable is not state of the art for transistor circuits... LEDs should be in the same circuit branches as 1k resistors, so as to minimize base/emitter current. This is true with NPN and PNP transistors (but with reversed emitter and collector positions).So to respond to O.P., yes, you could use it to drive bulbs, but you should modify the circuit a bit : replace 1k resistor by the bulb (if the bulb's rated power is lower than the transistor's rated current), remove LEDs, and "short" emitter to negative terminal of the power supply. Or, if the bulb's rated power is greater than the transistor's, drive it using a relay or (even better) a higher power npn-transistor/N-channel MOSFET whose base/gate you should connect to the collector of the original transistor.

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  • How to Charge Your Lithium Battery!

    "According to the datasheet of the relay, it takes 75% of 12 volt for the relay to open. So, give or take, 0,5 seconds this Circuit will delay the opening of the relay. Plenty of time for the Step-Up/Down module to charge up."==> you meant "for the relay to close" and "delay the closing of the relay"? Because otherwise it would not mean anything and wouldn't be coherent with the schematic...

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  • Multi Purpose Rotary Machine - Mulling, Welding, Pottery, Photography Turntable

    Nicely done, I'll try it!I am puzzled by the zero crossing detection part...The PC817 datasheet says max input voltage is 3Vcc. In this application it seems like the input is connected to a rectified 230V... Are the 30k resistors doing something like a voltage divider? Am I reading the datasheet wrong? How is that working?Bonus question : is it OK to put 2x 60k 0.25W resistors in parallel to compensate for the 0.5W resistors I do not have?

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  • How to Make Clapping Switch Circuit

    Hi !Nice work!Do you think that other NPN transistors would work? With similar or close current and voltage characteristics ?

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  • "that enables 1 to 2 degree Celsius compass heading accuracy"...OK so if 1 Celsius is 1.8 degrees Fahrenheit, and one complete circle is 360 degrees, then a complete circle must be 200 degrees Celsius ?(Joke actually stolen from xkcd ;P)

    "that enables 1 to 2 degree Celsius compass heading accuracy"...OK so if 1 Celsius is 1.8 degrees Fahrenheit, and one complete circle is 360 degrees, then a complete circle must be 200 degrees Celsius ?(Joke actually stolen from xkcd 😜)

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