Tell us about yourself!
I would argue that even though the manufacturers call them "COB" because _they_ bond the LED chips directly to a ceramic substrate, products like Vero's Bridgelux are in fact self-contained components, or modules, as far as the user is concerned. Vero, in fact, calls them "modules" throughout their literature. Traditionally (in my experience), COB means that dice are glued directly to an end-product's PCB, the "B" in both acronyms meaning "board" :)
Not to be overly pedantic, but I believe words and terminology are important. This is not chip-on-board, these are SMD LEDs. The LED chips themselves are inside self-contained surface-mount packages, with bonding wires from the chips to the SMD mounting terminals. In COB, the chip (piece of semiconductor wafer) is glued directly to a PCB, gold bonding wires are attached from the chip to the PCB using highly specialized machinery, and the whole thing is covered with a glob of epoxy. There is no practical way to repair COB, but then again COB is never used in LED lighting AFAIK.
Nixie Watch Prototype_A
Gorgeous, love it.
DIY Color Changing Raw Wood LED Shelf
Nice job. I made a plasma speaker as a science fair experiment in 1968, but it didn't sound as good as yours :) Back then it was deemed necessary to add ions to the plasma to increase its conductivity - there was an asbestos wick and some kind of metal chloride solution I think.A couple of points:- Paralleling MOSFETs increases their current handling capability, not their voltage handling. For higher voltage you must put them in series.- The 175ºC max temp for the devices is their _junction_ temperature, not the temperature of the outside of the case. The junction temperature is probably significantly higher than your 70ºC case, depending on heat sinking.
Thanks! Yes, they're all 3-D printed parts.
Here are some samples.
For both black or white backgrounds, I use sheets of foam-core board, available at office supply stores. Inexpensive, easily stored and kept at hand, and easy to replace if they get marred.
Here are some samples (I think... this UI is confusing).
Industrial Fly Trap
The Tudor Rose Box Assembly Instructions
Hot Glue Matches
Bubbling Pipe Lamp
Robot Foam Cutter
Large Vacuum Former
Soft Robots: Making Robot Air Muscles
3d Print An Artificial Muscle Robot Hand
Soft Robots: 3D Printing Artificial Muscles
3D Print: Make Servo Controlled Valves
DIY Front Surface Mirror
Treehouse Hardware Series - Tree Attachment Bolt (TAB)
Plasma Bulb with Clock Gear
Desktop Terrarium with Night Light
Tiny Planet: A 3D Printed Mechanical Sculpture
Industrial Pipe Shelving Built-In
DIY Quick & Easy Modern Cat House
Geoweaver: A Walking 3D Printer Hexapod
Web Controlled 8-Channel Powerstrip
Swingin' Vintage Suitcase Stereo
Suitcase Picnic Table and Speaker System
Sculpting with Sound
An Airship Admiral's Sidearm. An elegant steampunk pistol.
Laser Cut Peach Pie
Lamina Nixie Clock