Light Emitting Diode-Current Limiting
Resistor Calculator - The calculators on this page can
be used to find current limiting resistors and currents for Light Emitting Diodes. The first calculator
determines the resistance for a desired LED current while the second calculates the current for a given
resistance. . . . [from Rob Paisley's Model Train web site]
Network linearizes DC/DC converter's current-limit characteristics - 10/13/05 EDN Design Idea Thermistor adds to efficiency, eliminates sense resistor. . .
[by John Guy and Lance Yang, Maxim Integrated Products Inc, Sunnyvale, CA]
Pira CZ Stereo Encoder for FM Broadcasting - This stereo encoder is a halfway between analogue and digital processing. It combines the
best from both domains to provide high-quality and easy to build device. The sampling frequency used in this
stereo encoder is 97 times. . .
Provide Hiccup-Current Limiting - 06/26/03 EDN Design
Idea Current-limit protection is an essential feature for power-supply systems. The three major types of
current-limit-protection mechanisms are constant, foldback, and hiccup. Hiccup current limit performs the
best of the three types; . . . [by CH How and KP Basu, Multimedia University, Cyberjaya, Malaysia]
Provides Hiccup-Current Limiting - 06/26/03 EDN
Design Idea Current-limit protection is an essential feature for power-supply systems. The three major
types of current-limit-protection mechanisms are constant, foldback, and hiccup. Hiccup current limit
performs the best of the three types; . . . [by CH How and KP Basu, Multimedia University, Cyberjaya,
Malaysia]
Rechargeable Flashlight Obsoletes Lantern Battery - 11-Dec-03 EDN Design Idea This Design Idea describes a high-intensity, rechargeable
flashlight system that you can build from a 6V lantern-type flashlight. The rechargeable battery comprises
four 2V, 2. 5-Ahr (ampere-hour] SLA (sealed lead-acid] cells, similar . . . [by Fran Huffart, Linear
Technology App Note, Milpitas, CA]
Simple & effective inrush current limiter stops surges - 08/02/07 EDN Design Idea Active circuit and relay replace lossy
negative-temperature-coefficient thermistor. Offline power supplies that drive loads of 200W and more require
inrush-current limiters. Unrestricted inrush currents can reach hundreds of amperes, which may damage the
line rectifier, open the fuse and input-filter inductors, and damage the PFC (power-factor-correction) filter
capacitors. A simple method of limiting the inrush current uses an NTC (negative-thermal-coefficient)
thermistor that connects in series with the supply line. . . . [by Gregory Mirsky]
Simple and effective inrush-current limiter stops surges - 08/02/07 EDN Design Idea Active circuit and relay replace lossy
negative-temperature-coefficient thermistor. . . [by Gregory Mirsky, Juno Lighting Group, ModuLight
Division, Des Plaines, IL]
Soft limiter for oscillator circuits uses emitter-degenerated differential pair - 10/12/06 EDN Design Idea Phase-shift network plus a few active components yields
low-distortion output - Most oscillator circuits include a nonlinear amplitude control that sustains
oscillations at a desired amplitude with minimum output distortion. One . . . [by Douglas Sudjian, Resonext
Communications Inc, San Jose, CA]
Stereo Limiter - Stereo Broadcast Limiter Circuit for Ramsey. . . .
Voltage Reference
sets Current Limit - 11/19/98 EDN Design Idea (File
has serval designs) ower op amps have a real need for active output-current limiting. Most power-amplifier
designs rely on the voltage drop across a user-supplied sense resistor to turn on an internal transistor.
This method has several drawbacks, notably, an inability to change the current-limit point under program
control. The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to
one of the amplifier's pins. With this design, it is possible to set the current-limit point with the output
of a DAC, possibly under the control of an embedded µC. . . . [by Joe Engle, Burr-Brown Corp, Tucson, AZ] |