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Tricolor
LEDs Create A Flashing Array - 06/24/10 EDN Design Idea
You can build a matrix of RGB (red/green/blue) LEDs using a simple and inexpensive circuit comprising the control
logic and driver circuit in Figure 1 and some LEDs (Figure 2). The center RGB LED is the first to come on, after
which . . . [by Jeff Tregre, www.BuildingUltimateModels.com, Dallas, TX]
Trip the Light Fantastic with LED Gadget Freaks - Here is a collection of the best LED gadgets that have made themselves home in Gadget Freak.
. . .
Twi-light
using white LEDs - This sunlight-controlled lamp uses a
light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate
resistors are connected in series with each row of the LEDs. . . . [© EFY Enterprises Pvt. Ltd. All rights
reserved]
Two LED trouble light system - No circuit description, schematic only. . . [CdS Electronic's website]
Two LEDs Perform Rudimentary Spectral Analysis - 09/01/94 EDN Design Idea A pair of LEDs having different wavelengths can supply the
stimulus for a rudimentary spectral analysis during quality-control sorting operations. By measuring the
reflectance of each LED, the circuit in Fig 1 can provide information. . . [by Peter Bojilov, Isomatik Sortex
Ltd, Pazardjik, Bulgaria]
Two PIC pins drive
six LEDs - 06/09/14 EDN Design Idea Here’s a take on LED
multiplexing with minimal output pins. This Design Idea demonstrates a new method of driving six LEDs with only
two I/O lines from a microcontroller, and so is particularly suitable for any pin-limited chip. It uses a pair of
I/O lines combined with a pair of complementary bipolar transistors. . . [by Benabadji Noureddine]
Two Signals Easily Control Tricolor LED - 09/14/95 EDN Design Idea Tricolor LEDs come in two- and three-pin packages. Although the
three-pin, or common-cathode, package easily lends itself to 2-bit control, wiring three crowded pins can be
mechanically difficult. Also, fewer manufacturers produce. . . [by Bob Richards, Digital Audio Corp, Raleigh,
NC]
Two
transistor circuit lights LEDs - 04/09/09 EDN Design
Idea A previous Design Idea describes a circuit that uses an astable multivibrator to drive an LED (Reference
1]. The circuit in Figure 1 uses a simpler alternative approach. The circuit uses a 2N3904 NPN transistor and a
2N3906 PNP trans. . . [by Barry A Tigner, Michigan State University, East Lansing, MI]
Two Transistor Flasher - The basic two-transistor flasher shown below has found its way into dozens of applications
due to its simplicity and versatility. Applications have included such diverse circuits as a micropower low
battery indicator, a lightning detector, a off-line. . . . [Charles Wenzel (unless otherwise noted)]
Two Transistor LED Flasher - This circuit will flash a bright red LED (500 mcd as an attention getting device or fake car
alarm. Componten Values are not criticl and transistors may be used. Flash duration is determined by R2. . . .
[Bill Bowden's circuit
Two-LED Pilot Light - 230 or 115 Vac mains operated Very simple circuitry. . . [Flavio Dellepiane's web site]
Two-Signals Easily Control Tricolor LED - 09/14/95 EDN Design Idea Tricolor LEDs come in two- and three-pin packages. Although the
three-pin, or common-cathode, package easily lends itself to 2-bit control, wiring three crowded pins can be
mechanically difficult. Also, fewer manufacturers produce. . . [by Bob Richards, Digital Audio Corp, Raleigh,
NC]
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