Category: Led

This is an “Audio VU Meter” or “Sound Level Meter”, it is a general-purpose bar-graph Audio VU meter designed for fun projects. All you need is to hook up one wire to the output of the audio amplifier’s speaker pin along with GND and see the magic. The response of the circuit...

LED technology is opening the door to a variety of high-power-illumination applications. The circuit in Figure 1 can let you know when ac power is available. To drive a power LED from the ac line requires a converter or a similar arrangement. In this circuit, a passive dropper greatly...

ROHM recently announced the 1608-size high accuracy blue-green chip LEDs, SMLD12E2N1W and SMLD12E3N1W. These products support the adoption of Color Universal Design (CUD) in a variety of applications, such as fire alarm system indicator lights, industrial equipment warning lamps and...

The probability of having microorganisms survive on a surface or item subjected to treatment is very low; decontaminating an object or material makes it safe to handle. While there are many techniques capable of effectively disinfecting surfaces, not many can be used independently...

Cree has announced the CV94D-FCC LED that integrates three emitters in a compact surface-mount device (SMD) package. The package includes tightly packed red, green, and blue (RGB) emitters enabling full-color signs or displays based on solid-state lighting (SSL) technology. Cree...

There’s many a time when you want to connect a white LED to a microcontroller operating from a 3 V supply voltage. Unfortunately, this doesn’t work and your nice white LED only lights up feebly or not at all. Why does it work perfectly with red and green LEDs, but not with white? A...

Lighting to energize or relax: new LED packages help improve alertness and the quality of sleep by adjusting melatonin levels. Samsung Electronics unveiled its first “human-centric” LED packages, collectively known as LM302N. Engineered with carefully created light spectra, the...

Lumileds has added news LEDs to its Luxeon IR Domed Line with a significant increase in both DC and pulse drive current–up to 1.5A and 5.0A, respectively. The new emitters deliver radiant power of 1350mW at 850nm wavelength (slightly visible) or 1450mW at 940nm (invisible or covert...