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Night Light Saver V6 - Latest design night light saver, built with sdcc. . . [Wichit Sirichote, designer]
Noise
Filtering & the ADT7461 - AN-699 Analog Devices
Application Note. . .
Notebook Battery Charger Monitor -
STMicroelectronics-Application. . .
Notebook Computers - Application Block Diagram. . . [Intersil]
Novel Floating Current Source - 05/01/03 EDN Design
Idea One-shot provides frequency discrimination - Figure 1 shows a polarization circuit applicable to ISFET
(ion-sensitive field-effect-transistor] sensors. ISFETs are solid-state chemical sensors that measure the pH
value of a solution i. . . [by S Casans, AE Navarro, and D Ramirez, University of Valencia, Burjassot, Spain]
Novel
Idea Implements Low-Cost Keyboard - 04/03/03 EDN Design
Idea Many applications that use a microcontroller also use a keyboard. If your application uses a relatively
powerful microcontroller, you can use several free I/O pins or an unused input with an ADC to effect an easy
keyboard connection. . . [by Jean-Jacques Thevenin, Thomson Plasma, Moirans, France]
Null Printer Adapter - . . .
Octal DAC Interfaces to DSP µp
- 05/23/96 EDN Design Idea The circuit in Figure 1 shows how you can connect an octal DAC (MAX521) to a DSP
µP (ADSP- 2101) using 2 bits of a port mapped into the data memory. The interface circuit includes a 1 kV
current-limiting resistor on the SDA signal line because the DAC pul. . . [by Dhananjay Gadre, IUCAA, Pune,
India]
One µC pin makes half-duplex RS-232C - 08/05/99 EDN Design Idea In many µC designs, nearly all the I/O pins are occupied. If only
one I/O pin is available, the circuit in Figure 1 can help you implement a serial RS-232C interface. For many
purposes, half-duplex operation using a software-driv. . . [by Marin Ossman]
One Second Time Base from
Crystal Oscillator - The schematic above illustrates
dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base.
Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated
together to produce the desired division. Using a crystal of some even multiple of 2 is desirable so that one
stage of the counter automatically toggles every second which eliminates the need for the NAND gate and reset
circuitry, however the circuit below illustrates using a crystal which is not an even multiple of 2 and so
requires additional. . . [Circuit Design by Bill Bowden]
One wire connects
microcontrollers - 10/22/98 EDN Design Idea (File has
several circuits, scroll to find this one) Low-cost µCs, such as Motorola's 68HC705 Series, offer great
simplicity at the expense of some useful functions—notably, serial data transmission. Unlike their predecessors,
these µCs do not have serial communication interfaces (SCIs), serial peripheral interfaces (SPIs), or simple
serial I/O ports (SIOPs). This method describes how you can overcome this deficiency by creating an asynchronous
serial interface through µC software. . . [by Abel Raynus, Armitron International, Melrose, MA]
One-wire keypad interface frees microcontroller-I/O pins - 03/31/05 EDN Design Idea Using this interface topology, you can reduce the number of
keypad interface wires to just one and thus save critical microcontroller I/O ports. . . [by Israel Schleicher,
Prescott Valley AZ]
Optimizing A Silicon Bipolar LNA Performance
for Blue Tooth Applications 12/11/00 - Application Note
Doc #931. . . [California Eastern Laboratories]
Optimizing Bluetooth Device
Battery Drain Measurements in Manufacturing - Application
Note. . . [Aligent]
Optimizing Laptop Docking Station
Designs using LAN Switches - Application Brief # 041. . .
[Pericom Semiconductor]
Optimizing Serial Bus Operations with Proper Write Cycle Times - Application Note Published 26-Aug-97. . . [Microchip]
Optimum Current Sensing Techniques in CPU
Converters/ AB-20 - Fairchild App Note. . .
Opto-Isolated Stepper Motor Controller - . . . [by IQ Technologies Industry, unless otherwise noted online]
Output Voltage Drift in the RC5039/ AB-22 - Fairchild App Note. . .
OverVoltage Protection for
LM317 - This circuit is a modified version of an original
interface on QSL Net. It is a fully isolated interface allowing computer control of the Trio/Kenwood R5000
receiver. Separate software is needed to control the receiver. . . . [submitted by Adam]
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