Recent content by Datman

fenix-store
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    365nm UV LEDs???

    Here you can see some pictures. Power is by USB-C or 5...24V (internal SMPS). https://postimg.cc/gallery/g0Z59L0 Differences between LEDs are only in the picture, due to different angles.
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    365nm UV LEDs???

    Not exactly :) Specification Chip Brand: Epileds Emitted Color: Ultra Violet UV Wavelength: 365nm/380nm/395nm/420nm Power: 5W DC Forward Voltage (VF): 3.8V~4.2V DC Forward Current (IF): 350mA~1.2A PCB Material: Copper PCB Diameter: 20mm Package Include: 5x 5W...
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    365nm UV LEDs???

    In 2019 I bought 5x LG 3W UV 365nm leds from led-world2007 on ebay, some ZWB2 filters and I made a UV light in a wood case. Now he sells only Cree 5W LEDs. You have to pay attention to the heat: mount LEDs on thick aluminium and put a fan pointing at it. Use thick sandpaper to increase heat...
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    Cylindrical beam spotlight

    Hi all I want to make a LED spotlight with a target of about 30cm (12 inch) at 3~15 meters (10~50 feet). Battery powering is not needed. I can power it by mains. Firstly, I thought using lenses. I bought this from Aliexpress...
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    messing with the natural volt and amp

    No, it's impossible. If current flows, filament heats up, resistance increases, voltage increases until an equilibrium is reached.
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    DIY constant current mosfet driver

    For that problem, you can first solder a Zener diode, then the mosfet with G connected to the K and S to the Anode. It will be protected during your work.
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    Test & Charge charging?

    I'm thinking... Can a Li-ion be charged with a switching Test & Charge technique? It could be something like this: (Tt=Ttest=1s; Vt=Vtest=4.20V; Ic= Icharge; Tc=Tcharge=20s; Vc= Vcharge); Imax=500mA Tt: Vt=4.20V; an Ic=500mA is read: => Tc: Ic=500mA (max) (Vc=4.20V) Red LED Tt: Vt=4.20V; an...
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    Replace old Ni-MH battery with a higher capacity Li-ion one...

    It shouldn't be a big problem, because dynamo couldn't give a very strong current. It is like charging the Li-ion battery with a constant current. I think that something made to not damage a 80mAh NiCd battery can't damage a 750mAh Li-ion. The battery will likely work under-charged, with a long...
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    Flashlight driver

    My original driver is 20mm. It needs an adapter anyway.
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    Flashlight driver

    Uhmm... It says: * Voltage input: 2.8V - 5.5V * Low and medium mode are current controlled, not PWM * Perfect regulated circuit for constant current output It seems "High" is not current regulated, like using a simple buck switching regulator... A buck/boost or SEPIC or inverting configuration...
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    Flashlight driver

    The spring is very long. Using SMD's there should be enough space. Shipping from USA to Italy requires very long time and I'll have to pay customs (if the parcel will arrive at my home...). I build my projects using salvaged devices. I have a very large quantity of them. Many of them are very...
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    Flashlight driver

    I have already built many buck and boost switching regulators, up to 4A. Major difficulties are to get the right transistors (fast, low Vcesat, high gain), coils (100~200uH) and diodes (Schottky). I salvage and keep many components from broken switching regulators I'm thinking to try something...
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    Flashlight driver

    http://i50.tinypic.com/2z5ui2p.jpg Ooops... Output capacitor polarity is wrong! Your image is too large and has been replaced with a link. Please resize and repost. See Rule #3 If you post an image in your post, please downsize the image to no larger than 800 x 800 pixels. - Thanks Norm
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    Flashlight driver

    Thank you, LowLumen. It's very interesting, altough it costs about 17$ (14€) shipping included, more than I paid for my flashlight... :) I'm thinking to make a switching current-regulated supply, using a MC34063, inverting configuration. Problems are: -space -a suitable small coil -no memory: I...
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    Chinese flashlight and the descriptions in ENGLISH

    You will be satisfied, content, tant felic, nu babà! Napoletan English? :)
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