LB-48: Linear Brief 48 Simple Voltmeter Monitors TTL Supplies:  National Semiconductor Application Note   (app note added 6/06)

Level Shifters: Why We Can't Shift Away:  Pericom Semiconductor Application Note # 066 (app note added 02/05)

Limiting Amplifier is Digitally Programmable:  06/04/98 EDN-Design Ideas / (added 6/06)  Amplitude limiters are necessary in many systems, such as radar and FM receivers, for which the system cannot allow the amplitude of the signal to exceed the given positive, negative, or both limits. In the circuit in Figure 1, amplifier IC4B's maximum output is digitally programmable over ±2 to ±10V in 2n steps, where n is the number of bits of the DAC. IC1, a precision 10V reference, provides a full-scale reference current, IREF=VREF/R1=2 mA, to IC2, a multiplying DAC. IC3's output voltage, VL, is the sum of the product of the digital word and unipolar...

LIN Protocol Implementation using Picmicro® Mcus:  Microchip Application Note Published 4-Feb-00   (app note added 2/06)

LIN Slave Node on a PIC16c433:  Microchip Application Note Published 8-Nov-02   (app note added 2/06)

Linear Circuits for Digital Systems:  AN31 Linear Technology Subtitled "Some Affable Analogs for Digital Devotees," discusses a number of analog circuits useful in predominantly digital systems. VPP generators for flash memories receive extensive treatment. Other examples include a current loop transmitter, dropout detectors, power management circuits, and clocks.

Live Insertion in High Speed Data Communications using 3.3V Bus Switches:  Pericom Semiconductor Application Brief # 031 (app note added 02/05)

LM3909 LED Flasher:  (electronic circuit added 4/05)

LM3909 Replacement using Discrete Components:  (electronic circuit added 4/05)

LM628 Programming Guide:  National Semiconductor Application Note   (app note added 2/06)

Logic Analyzer Pushes Microcontroller to Its Limit:  12/07/00 EDN Design Ideas /  (added 11/05)

Logic Family Voltage Translation:  how to translate between TTL, 74xx, CMOS, ECL, PECL, Low Voltage TTL, LVTTL, etc. (added 4/02)

Logic IC Yields Simple Wide Range Timer:  08/01/97 EDN Design Ideas  / (added 11/05)  You can use a 4060B binary counter/oscillator to make a simple, accurate, long-delay timer. The circuit offers longer times (milliseconds to hours) than you can achieve with common IC timers. A positive logic level at the input holds the counters in the reset state and the output in the low state. When the input goes low, the output goes high, forward-biasing D1 and "stalling" the oscillator.

Logic Offers Complementary Switch Control:  12/06/01 EDN Design Ideas  /  (added 1/05)  The complementary-switch controller in Figure 1 uses a few inverter gates to provide drive signals for the complementary switches. Complementary-switch configurations find widespread use in synchronous-rectification circuits, charge pumps, full-bridge control circuits, and other circuits. The circuit in Figure 1 provides not only a complementary drive signal but also a deadtime delay ... ...

Logic Powered Serial EEPROMs:  Microchip Application Note Published 26-Aug-97   (app note added 2/06)

Logic Probe #1:  (electronic circuit added 7/03)

Logic Probe uses Bicolor Led:  03/13/98 EDN-Design Ideas / (added 03/03)  

Logic PSU with OverVoltage Protection:  5 volt regulated power supply for TTL and 74LS series integrated circuits, includes output Overvoltage fault protection (added 6/06)

Logic Reduces Emi:  08/05/99 EDN Design Ideas / (added 0505) A current-input ADC whose primary use is measuring low-level signals from photodetectors can also measure a range of voltages using the circuit in Figure 1. The main component is a dual-input current-integrating ADC, IC1. IC2 and IC3 provide the buffered 4.096V reference for IC1. The figure does not include a µC, which typically oversees the digital control and data retrieval.

Logic that Mutates While-U-Wait:  11/07/96 EDN-Design Feature / (added 2/06)   Dynamically reconfigurable logic designs whose function can be customized to a particular system or application on the fly bring possibilities with hairy challenges.—Clive "Max" Maxfield, Intergraph

Loop Stability with Reactive Loads - Using the Power Design Tool - App Note 38:  Apex Microtechnology Corp App Note (added 6/06)

Low Cost Digital Code Lock:  (electronic Circuit / Schematic added 10/04)

Low cost relative humidity Transmitter uses single logic IC:  11/08/01 EDN Design Ideas  /  (added 1/05)  The low-cost percentage-relative-humidity radio transmitter in Figure 1 operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to 5 C. It is generally difficult to collect such data from a low-temperature area with high humidity and low illumination. The transmitter design is simple: It uses a readily available, capacitor-type percentage-relative-humidity se... ...

Low Cost USB Microcontroller Programmer the Building of the Pickit™ 1 Flash Starter Kit:  Microchip Application Note Published 7-Jul-03   (app note added 2/06)

Low Noise AC Amplifier has Digital Control of Gain and Bandwidth:  02/05/2004  EDN-Design Ideas  In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum.  (added 6/06)

Low Power Technology (Lpt) 3.3V Logic Lcx and Fct3 Logic:  Pericom Semiconductor Application Brief # 002 (app note added 02/05)

Low speed implementation for LightScribe / AN-4144:  Fairchild Application Notes / (app note added 6/06)

Low Voltage Interface Circuits Translate 1.8 to 5V:  11/05/98 EDN-Design Ideas / (added 3/03)  

Low Voltage Reset Operates BeLow 2.7V:  03/26/98 EDN-Design Ideas / (added 03/03)  

Low-Power Design using Picmicro Microcontrollers:  Microchip Application Note Published 7-Oct-05   (app note added 2/06)

LVTC Logic Family for Live-Insertion using Standard CMOS Processing:  Pericom Semiconductor Application Note # 062 (app note added 02/05)