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  • Joule Thief With Ultra Simple Control of Light Output

    boosting the master switch closing seems to improve efficiency, requires 3-ple winding for best timing+driving -- as the LC values define AC profile -- it must be obvious that achieving the circuit tuning (as in simulator also) in real is much of a fairy tale - though not completely unlikely ... a waste of time stuff -- that's why don't build'em anymore

    yes, Hi! - i also was exited built these some while ago - what i learned was - powered from single 1.2 - 1.6 V cell the blocking osc. has a best performance efficiency at about-below 30mA operation e.g. (it's likely not a rule but difficult to avoid) , attempting the high output power v.-s results (speculating) the magnetic saturation - as the first 20s my led was ultra-bright - and then i couldn't repeat it even by changing the transitors , cite "Another “core loss” is that of magnetic hysteresis. All ferromagnetic materials tend to retain some degree of magnetization after exposure to an external magnetic field. This tendency to stay magnetized is called “hysteresis,” and it takes a certain investment in energy to overcome this opposition to change every t...see more »yes, Hi! - i also was exited built these some while ago - what i learned was - powered from single 1.2 - 1.6 V cell the blocking osc. has a best performance efficiency at about-below 30mA operation e.g. (it's likely not a rule but difficult to avoid) , attempting the high output power v.-s results (speculating) the magnetic saturation - as the first 20s my led was ultra-bright - and then i couldn't repeat it even by changing the transitors , cite "Another “core loss” is that of magnetic hysteresis. All ferromagnetic materials tend to retain some degree of magnetization after exposure to an external magnetic field. This tendency to stay magnetized is called “hysteresis,” and it takes a certain investment in energy to overcome this opposition to change every time the magnetic field produced by the primary winding changes polarity (twice per AC cycle). This type of loss can be mitigated through good core material selection (choosing a core alloy with low hysteresis, as evidenced by a “thin” B/H hysteresis curve), and designing the core for minimum flux density (large cross-sectional area)." src: Practical Considerations - Transformers - so i assume i permanently saturated/spoiled the small ferrite core with pre-magnetization - must be studied. . . those things proof their value during blackouts where you can use 1 (efiicient or not) per room and it works about 24h from little used battery before starting to fade - ! a great invention !

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  • ReneJ2 commented on ROBO HUB's instructable HANDPOWERED SERVO TORCH2 months ago
    HANDPOWERED SERVO TORCH

    New York City viideeoo nana nan naa nan naa naa naa naa naaa . . . Sempre assim, Em cima, em cima Em cima, em cima Sempre assim, Em baixo, em baciu Em baixo, em baciu(todays mood , muhahaa)

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  • ReneJ2 commented on The Oakland Toy Lab's instructable Splitting Water the Easy Way2 months ago
    Splitting Water the Easy Way

    https://www.hydrogen.energy.gov/pdfs/progress10/ix...

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  • Joule Thief With Ultra Simple Control of Light Output

    i suggest 27 to more turns for coils also apx. 1:3 for power coil : driver coil ratiothe minimum of 3 (ampere-)turns for power (Collector or Emitter) coilthe minimum of 14 turns for driver (Base) coilfor the oscillations expected to be to start/occur/continuekeywords "magnetic coupling"

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  • ReneJ2 commented on NEW PEW's instructable USB Mini Drill2 months ago
    USB Mini Drill

    a clockers must -- if your CPU gives thermal -- you just drill more holes to the PC case (shot up me stupid cat, muhahaa)

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  • ReneJ2 commented on Srpska Nauka's instructable How to make a Joule Thief2 months ago
    How to make a Joule Thief

    the best transistors for the project are MJE13005 or russian КТ805АМ

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  • ReneJ2 commented on ROBO HUB's instructable HANDPOWERED SERVO TORCH2 months ago
    HANDPOWERED SERVO TORCH

    (related subjects) if we integrate rectifier , capacitor , modulated LED drive¹ with current control² ((then it's not sure if it's all worth it ... unless we succeed to find the working configuration for particular combination of hardware -- servo , LED , ...))¹ http://www.instructables.com/id/555-Timer/step7/5...(the PPM drive is likely easier to fine tune for MOS-FET and vice versa than PWM -- about¹)² http://forum.allaboutcircuits.com/threads/can-som...(there are not too many good precision high current limiting circuits -- about² -- though all above may need modifications to fit in to new needs)

    very good initiative for servo generator use(i guess i have some floppy drives lying around F;i)

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  • DIY Bag From Recycled Plates | DIY Craft for Little Girls

    the material is waterproof and just !!perhaps (something that does not allow molds attatch to it) and recycled . . . but fragile** -- flipping the decorated half , reattacing the belt through **slide holes . . .((my grandpa and his sis grew up in Siberia where they made all their stuff out of nothing or natural materials mostly -- when she did babysit us she taught us a lot of tricks - also how to tell fairitales "out of lamp" -- shure others may notify you to change the scenario if they won't like it or it doesnot keep up the ecxitement - if it's such story . . . ))

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