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Computer Interfaces  Page 1
Computer Interface: 
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Last Updated on: Saturday, August 30, 2014 10:27 AM
 


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
µC reprograms audio DAC via serial interface -  01/07/99 Issue of EDN  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,....Page includes several designs.  Scroll to find this one.... [Design Idea by Lukasz Sliwczynski, University of Mining and Metallurgy, Institute of Electronics, Cracow, Poland]
µP Socket Automatic ally Senses Upgrade -  03/03/94 EDN-Design Ideas  The circuit in Fig 1  automatically senses when a user upgrades a Motorola 68040 µP system.... [Design Idea by Thomas Mosteller, Linear Technology Corp, Lansdale, PA]
0 to 10 Volt Analog Control Protocol -  (circuit / schematic design added 6/06)
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.... [Circuit Design by Bill Bowden]
10 Base T Solutions Network Interface Adapter (SB-119) -  National Semiconductor Application Notes,28 Jun1996 / (app note added 5/02)

10 Hints for Making Better Network Analyzer Measurements -  Aligent Application Note  (app note added 6/07)
10 Tricks for Interfacing to the PIC16c508 -  (electronic circuit added 7/03)
10 Watt Multiple Output Isolated Power Supply -  This design kit is an isolated converter (EP-18) for a High Speed Digital Modem application.  (added 3/05)

100 MHz Clock Solution for Desktop Computers -  Pericom Semiconductor Application Brief # 021 (app note added 2/05)
10mbps Multiple Protocol Serial Chip Set: Net1 & Net 2 Compliance By Design -  DN174  Design Notes (Linear Technology) (app note added 1/06)
12 DB Amplifier & High Current Line Driver with DC Servo -  AS024 Jenson Transformer Application Note  (app note 6/07)
17 Bit PC Serial Port Receiver CMOS -  (electronic diagram added 6/06) 
18-bit ADC uses PC's serial port -  09/27/01 EDN-Design Ideas  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 supplies as well as control signals. IC1 is an 18-bit MAX132 ADC with a serial interface. It requires three input control signals, , DIN, and SCLK, and emits serial data, DOUT.... [Design Idea 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.  ….(Circuit design added 11/08)
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....(design added 06/06/06)
1k, 2k & 4k Microwire EEPROM Migration -  Microchip Application Note Published 6-Apr-04   (app note added 2/06)
2 Channel Port Powered RS-232 to RS422 Converter -  information on commercial product, datasheet includes full circuit diagram   (added 4/02)
2 transistor circuit replaces IC -  7-Feb-02 Issue of EDN  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 actively drive both sides. However, as is sometimes the case, you can replace a complicated circuit by a simple one without much loss of performance.... [Design Idea 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 Transistors Form Bidirectional Level Translator -  You often need to convert a logic signal from one power supply voltage to another.  This conversion is a relatively simple task, unless the signal happens to be bi-directional. Serial buses such as Access.bus, I2C, and SBI use bi-directional data lines. Some buses may require translating logic from one voltage to another; for example....[Jim Hagerman, Nokia Mobile Phones, San Diego, CA] [Jim Haggerman, Hagerman Technology LLC]
2 Wire Communication Using Labview -  Maxim Application Notes / 1190 / Jun-03  (app note added 5/08)
2 Wire LCD Interface using PIC16cf84 -  (circuit / schematic design added 6/06)
2.5 Mb/s Isolated RS485 Communication Interface with up to 500 mW Supplementary Power  -  Application Note California Eastern Laboratories Doc #961  (app note added 06/06/06)
20 dB Amplifier & High Current Balanced Line Driver -  AS023 Jenson Transformer Application Note  (app note 8/08)
200 Watt Modified PC Power Supply 13.5 Volt 14 Amp -  (electronic circuit added 4/05) [OZ2CPU; Thomas from Denmark]
24 bit ISA card  -  Installs into your computer. Parts, plans, schematics and programmng available. Also may be purchased as a kit.  (added 6/05)
24 Bit Parallel Port Interface with 8255 for Commodore Computer -  High Quality simple unit. No need for a Preamplifier… [Peter Jakab, Electrical Engineer, Engineer of Informatics]
24 Line Parallel Interface for the PC  -  it is what it says it is.  (circuit added 05/09)
24-Bit Parallel Port Interface with 8255 for Commodore Computer -  High Quality simple unit. No need for a Preamplifier… [Peter Jakab, Electrical Engineer, Engineer of Informatics]
25 Watt MOSFET Amplifier -  High Quality simple unit. No need for a Preamplifier (added 9/04)
25-Pin PC Serial Port to MIDI Synthesizer Interface Cable -  (application / block diagram added 6/07)
27C801 EPROM Programmer Project -  (circuit / schematic design added 6/06)
27mhz Optical Mouse -  (application / block diagram added 6/07)
27mhz USB Dongle -  (application / block diagram added 6/07)
2-Input Mixer -  As simple as it gets.  mixer consists of two transistor-based preAmplifiers.  first one (designated "Mike in") offers higher gain. it works well with a regular dynamic microphone.  second one can be used to control audio input from a tape recorder/CD player.  (added 6/06)
2m-20m Transverter -  This little circuit is a transmitting and receiving converter (transverter) that converts a FT290 or similar multimode handheld transciever to the 14MHz amateur band. The project is a single board module that needs an external local oscillator, for example, the VHF harmonic oscillator (or QRP VHF FM TX) LO for transverter project. It should be a relatively simple matter of scaling coils.... [from Harry Lythall's website]
2-Wire LCD Interface using PIC16cf84 -  Alphanumeric LCD displays have become very popular for microcontroller applications because y can add a lot to a project in a variety of different ways. A text message giving  user instructions as well as feedback can make  application seem much more "professional" and easy to use. I like to use LCD's to help debug applications, with breakpoints set to display variable and I/O conditions and y are a lot cheaper than using a microcontroller emulator. To top it off, surplus LCD's can be found for a dollar or less.... (added 4/05)

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