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16CommentsJoined November 18th, 2015

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  • GregoryL20 commented on randofo's instructable Easy Jacob's Ladder1 month ago
    Easy Jacob's Ladder

    I would so love to play with lightning.

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  • GregoryL20 commented on randofo's instructable Easy Jacob's Ladder1 month ago
    Easy Jacob's Ladder

    Yes

    If you can get your hands on an oil burner transformer, you might try one of those (~10,000 v).

    I used to play with high voltage when I was studying electronics. I made high voltage dc gas laser power supplies using high voltage electrolytic capacitors, high voltage diode voltage ladders, and regulated through high voltage transistors. For transformers I used many types, with the safest being low-potted step down transformers pulled from tvs and monitors (no, not flyback transformers), high voltage transformers I bought from Allied Electronics, starter coils from cars, oil burner transformers, neon sign transformers, and the scariest of them all, high voltage microwave oven transformers. I used a 25,000V neon sign transformer to power a homemade Copper Chloride laser I made from a Scientific American article. I disagree with one person who says "instant death" because it...see more »I used to play with high voltage when I was studying electronics. I made high voltage dc gas laser power supplies using high voltage electrolytic capacitors, high voltage diode voltage ladders, and regulated through high voltage transistors. For transformers I used many types, with the safest being low-potted step down transformers pulled from tvs and monitors (no, not flyback transformers), high voltage transformers I bought from Allied Electronics, starter coils from cars, oil burner transformers, neon sign transformers, and the scariest of them all, high voltage microwave oven transformers. I used a 25,000V neon sign transformer to power a homemade Copper Chloride laser I made from a Scientific American article. I disagree with one person who says "instant death" because it really depends on the capacity of the transformer. For instance, if starter coils were really that dangerous, there would be dead people all over who died from the shock from the spark plug in their lawn mower. But take it from me, seriously, because I once suffered a shock that I thought should have killed me from a discharge of a bank of electrolytic capacitor storing 300uF of 3,000V, ...and I am the son of an electrician, and studied to be an electrician in vocational high school...you have to always know what your body parts are touching, and simply keep all family members, especially children, away from your projects, or you will be very sad for the rest of your life.

    Watching this person making marks on the frame, another interesting version idea comes to me...Has anybody ever tried skipping the metal conductor, and instead using graphite lines drawn on an insulative, high-dielectric surface, such as glass?

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  • Student hacks: Sub zero any drink in 60 seconds with this gadget

    This is basically the same technology used to turn cream into ice cream. You have made a mini ice cream maker.

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  • GregoryL20 commented on inspiretomake's instructable Meteorite Ring4 months ago
    Meteorite Ring

    I've been looking at meteorites on Ebay just last week! And knives made out of meteorite. What a great project idea!

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  • GregoryL20 commented on How-ToDo's instructable Powerful burning Laser5 months ago
    Powerful burning Laser

    There are many interesting and exciting things about this circuit. First of all, I didn't realize a 5mW red laser diode could burn like that! But one lesson, other than the interesting laser diode, would be the simple negative feedback to the LM317, by putting the Vadj AFTER the resistor, in order to regulate thermal runaway. I know it's a simple principle, but still interesting and important to electronics where you want current regulation. Just off the top of my had, I imagine someone could introduce a Zener diode in parallel with a resistor to regulate Iout.

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  • Levitron (electromagnetic levitation device)

    Even though the circuit looks simple, it has a lot of interesting lessons, like the Hall effect sensor, and inductance, and magnetism, and the use of super magnets. Makes me want to relive my mad scientist days from 25 years ago.

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  • Wireless Electricity Transmission (Simple things required to be collected from scrap)

    If I were to reproduce this experiment, I would skip the battery driven transistor, and go straight for rectifying radio signals right out of the air. If anyone has ever been burned or shocked touching a radio antenna, you know that radio waves transmitted through the air are converted to electricity in a coil.

    I'm not commenting on the semiconductors so much as the use of the battery. The circuit in this article is a fine example of oscillation tank and air core transformer.With a radio wave as the Vsource, we would have to use a germanium or selenium diode because of its low breakover voltage. That alone would probably not light up an LED, but if we could store the potential in a capacitor, it might charge enough to discharge into an LED.

    Basically, this is a transformer with an air core.

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