High Power LED Driver Circuits. High-power LED's: the future of lighting!
But... how do you use them? Where do you get them? 1-watt and 3-watt Power LED's are now widely available in the $3 to $5 range, so i've been working on a bunch of projects lately that use them. in the process it was bugging me that the only options anyone talks about for driving the LED's are: (1) a resistor, or (2) a really expensive electronic gizmo. now that the LED's cost $3, it feels wrong to be paying $20 for the device to drive them! So I went back to my "Analog Circuits 101" book, and figured out a couple of simple circuits for driving power LED's that only cost $1 or $2. This instructable will give you a blow-by-blow of all the different types of circuits for powering Big LED's, everything from resistors to switching supplies, with some tips on all of them, and of course will give much detail on my new simple Power LED driver circuits and when/how to use them (and i've got 3 other instructables so far that use these circuits).
GearBest - Gadgets & Electronics Deals. NXP Semiconductors. RasClock - Raspberry Pi Real Time Clock Module V3.0. RasClock is a highly accurate real-time clock that plugs directly into the Raspberry Pi and includes a battery backup.
The module is installed directly into the GPIO header pins with no wiring or soldering. It uses the 3.3V, GND SDA and SCL pins. The module stays within the outline of the Raspberry Pi and sits lower than video output so can be easilly installed within most cases. Updated V3.0 - The Rasclock now features an 8 Pin Header input, so boards can be stacked on top! RasClock utilises the highly accurate NXP PCF2127AT chip and features: Very accurate timekeeping (typically ±3ppm or <2 minutes deviation per year).
Why do I need a Real Time Clock for my Raspberry Pi? The Raspberry Pi is an ultra-small and ultra-low cost computer. The Raspberry Pi will simply revert back to the standard date and time settings (usually 30 November 1999) when the network connection is removed. How do I set it up? Set up is easy, simply follow the guide Outlined in the ModMyPi Raspberry Pi Tutorial Here! Microelectronics. Analog, Embedded Processing, Semiconductor Company, Texas Instruments - TI.com. Corporation - Microcontrollers, 32-bit, and touch solutions.
Development Tools. Raspberry Pi. RPI CAMERA BOARD - RASPBERRY-PI - RASPBERRY PI CAMERA BOARD, 5MP. Electronic and Electrical Components. Adafruit Industries, Unique & fun DIY electronics and kits. UV LED Exposure Box. Making PCBs. How to make really really good homemade PCBs Note - this article is original material.
There is currently a plagiarised copy of it on the site of an Indian electronics magazine credited to a rip-off artist called Indrani Bose. This page is a guide to producing consistently high quality PCBs quickly and efficiently, particularly for professional prototyping of production boards. Unlike most other PCB homebrew guides, emphasis is placed on quality, speed and repeatability rather than minimum materials cost, although the time saved by getting good PCBs every time usually saves money in the long run - even for the hobbyist, the cost of ruined PCB laminates can soon mount up! With the methods described, you can produce repeatably good single and double-sided PCBs for through-hole and surface mount designs with track densities of 40-50 tracks per inch and 0.5mm SMD pitches.
Artwork generation When defining pad and line shapes, the following minimum sizes are recommended for reliable results: Media.