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Computer Interfaces
Computer Interface: 
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Last Updated on: Thursday, June 25, 2015 06:20 AM

Circuits Designed by Dave Johnson, P.E. :
12v to 19v Laptop Power Supply (Concept) -  Concept Only. I have a big screen HP laptop computer. The large brick size AC to DC power supply is rated at 19. 2v and 9. 5 amps, which is about 180 watts. I’d like to be able to use the thing in my car. I looked into a 12v car adapter for it but never really found one that I liked. Most were underpowered. The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter . . . [Circuit by Dave Johnson P.E.,  07/26/09]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

µC Based Circuit Performs Frequency Multiplication -  05/27/99  EDN Design Idea   The traditional frequency multiplier requires many elements a phase comparator to detect the phase error between the input and the output signals, a lowpass filter to convert the phase error. . .  [by Yongping Xia, Teldata Inc, Los Angeles, CA]

 

µC reprograms audio DAC via serial interface -  01/07/99  EDN Design Idea (contains several designs, scroll to find this one)   You can use a simple µC to continuously program an audio DAC so that it operates in a 20-bit resolution mode ( Figure 1 ). After power-on, the PCM1710 delta-sigma DAC (Burr-Brown Corp, www. burr-brown. com) operates in its default 16-bit resolution mode. Switching to its 20-bit resolution mode requires supplying the converter with a control word using its three-wire serial digital interface (SDI). . .  [by Lukasz Sliwczynski, University of Mining and Metallurgy, Institute of Electronics, Cracow, Poland]

µP Socket Automatically Senses Upgrade -  03/03/94 EDN Design Idea   The circuit in Fig 1automatically senses when a user upgrades a Motorola 68040 µP system with a 68060 µP, changing the µP's supply voltage from 5 to 3. 3V. This automatic voltage change is far safer than any manual scheme could. . .  [by Thomas Mosteller, Linear Technology Corp, Lansdale, PA]

 

0 to 10 Volt Analog Control Protocol -  The information in this document is based on ESTA E1. 3, Entertainment Technology - Lighting Control System - 0 to 10V Analog Control Protocol, Draft 9 June 1997 (CP/97-1003r1) Before digital control systems, most remote control of lighting dimmers was done using an "wire per dimmer" system. Each dimmer had a dedicated control wire (or pair of wires). Low voltage DC control systems became the choice for many systems because of it's safety and flexibility. Many different low voltage systems were used (0. . 10V, 0. . 15V, 0. . 24V, 0. . -10V, etc. ) were used but over the time 0 to 10V became the most common. . .  [Tomi Engdahl]

1 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]

 

1 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]

 

1 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]

 

10 Base T Solutions Network Interface Adapter (SB-119) -  App Note, 28 Jun1996. . .  [National Semiconductor]

 

10 Hints for Making Better Network Analyzer Measurements -  Application Note. . .  [Aligent]

 

10 Tricks for Interfacing to the PIC16c508 -  Most of the ideas in this chapter can be found on the pages of this website, but just in case you want to go over the capabilities of the '508A, we have brought them together. Quite often when you are programming, the first thing you will run out of is output lines. Many projects need lots of drive lines and if you need more than about 8, you should go to another micro-controller. Don't expect an 8-pin chip to perform the impossible. . . .  [Prepared by Colin Mitchell]

 

10 Watt Multiple Output Isolated Power Supply -  This design kit is an isolated converter (EP-18) for a High Speed Digital Modem application. . . . 

 

100 MHz Clock Solution for Desktop Computers -  Application Brief # 021. . .  [Pericom Semiconductor]

 

10mbps Multiple Protocol Serial Chip Set: Net1 & Net 2 Compliance By Design -  DN174 Design Notes (Linear Technology). . .  [Linear Technology]

 

10Mhz GPSDO I (spanish) -  Utilizando un receptor GPS con salida de 10KHZ es sencillo crear un PLL que nos permita "disciplinar" un oscilador de 10Mhz. Esta es una manera fácil y barata de disfrutar en casa de una seńal patrón de gran precisión, impensable antes de la era GPS. La constante de tiempo del PLL nos permite jugar con su estabilidad y el ruido de fase viene determinado principalmente por la calidad del oscilador que elijamos. . . .  [Roberto Barrios EB4EQA]

 

12 DB Amplifier & High Current Line Driver with DC Servo -  AS024 Application Note (app note 6/07) . . .  [Jenson Transformers]

 

12v to 19v Laptop Power Supply (Concept) -  Concept Only. I have a big screen HP laptop computer. The large brick size AC to DC power supply is rated at 19. 2v and 9. 5 amps, which is about 180 watts. I’d like to be able to use the thing in my car. I looked into a 12v car adapter for it but never really found one that I liked. Most were underpowered. The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter . . . [Circuit by Dave Johnson P.E.,  07/26/09]

 

17 Bit PC Serial Port Receiver CMOS -  . . .  [Bill Bowden, designer]

 

18-bit ADC uses PCs serial port -  09/27/01 EDN Design Idea   A PC usually requires a plug-in ADC card to process analog signals. However, with the circuitry in Figure 1, a PC can communicate with an 18-bit ADC through its serial port. The port provides both positive and negative power supp. . .  [by Yongping Xia, Teldata, Los Angeles, CA]

 

18F4550 USB Interface -  This board is a Microchip PIC prototyping board for the 18F4550 microcontroller using USB. It is designed to have the PIC loaded with a USB bootloader and then a separate programmer is no longer needed. The board has all the circuitry needed for a successful USB interface. Free I/O pins have 1-3 solder pads for easy connection for prototyping. . . . 

 

18F4550 USB Proto Board -  This board is a Microchip PIC prototyping board for the 18F4550 microcontroller using USB. It is designed to have the PIC loaded with a USB bootloader and then a separate programmer is no longer needed. The board has all the circuitry needed for a successful USB interface. . . 

 

1k, 2k & 4k Microwire EEPROM Migration -  Application Note Published 6-Apr-04 . . .  [Microchip]

 

1-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]

 

2 picogate devices for bidirectional level-shifting -  11-Nov-04 EDN Design Idea   In new mixed-voltage systems, it is often necessary to level-shift a control signal from a high level to a low level. An open-drain device, such as the 74LVC1G07, easily performs this shift. However, when a bidirectional signal req. . .  [by Bob Marshall, Philips Semiconductors]

 

2 transistor circuit replaces IC -  02/07/02  EDN Design Idea   Linear Technology's recently introduced LTC4300 chip buffers I2C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally, meaning that you can simultaneously and active. . .  [by Jim Hagerman, Hagerman Technology, Honolulu, HI]

 

2 Transistor Circuit replaces IC (Hagtech) -  I am always impressed with the way semiconductor manufacturers go out of their way to make the end designer’s job easier. One example is the LTC4300 recently introduced by Linear Technology. . . .  [Jim Haggerman, Hagerman Technology LLC]

 

2 wire 4 by 4 key keyboard interface saves power -  08/17/06 EDN Design Idea   Resistor matrix and microcontroller encode keypad - You can use a microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can use a resistive voltage divider to identify a presse. . .  [by Stefano Salvatori, University of Rome, Rome, Italy, and Gabriele Di Nucci, EngSistemi, Rome, Italy]

 

2 Wire Communication Using Labview -  App Note/ 1190 / Jun-03. . .  [Maxim Integrated]

 

2.16 Gbytes squeeze onto 3-in. disk drive -  11. 21. 96 EDN Design Feature Intégral just became the second disk-drive vendor to announce support for the 3-in. disk-drive form factor that JTS Corp (San Jose, CA) champions. The companies claim that the added disk surface area available on 3-in. media makes the drives a superior price/capacity choice to 2. 5-in. drives for applications such as notebook computers (see "Disk drives at 40: lean, mean storage machines, " EDN , Nov 7, 1996, pg 51). . . .  [by Maury Wright, Intégral Peripherals Inc, Boulder, CO.]

 

2.5 Mb/s Isolated RS485 Communication Interface with up to 500 mW Supplementary Power  -  Application Note  Doc #961. . .  [California Eastern Laboratories]

 

20 dB Amplifier & High Current Balanced Line Driver -  AS023 Application Note (app note 8/08) . . .  [Jenson Transformers]

 

200 Watt Modified PC Power Supply 13.5 Volt 14 Amp -  The external 230 Volt AC power ON/OFF switch is removed and bypassedOld unused outputs are removed. Over voltage protection changed to only protect one output at 16 V, Voltage regulating resistor net changed to only monitor a single output. . .  [OZ2CPU; Thomas from Denmark]

 

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