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A Bidirectional Level-Shifting Buffer for Raspberry Pi – Circuit Schematic
A Bidirectional Level-Shifting Buffer for Raspberry Pi
The current sourcing/sinking capability of the I/O pins on Raspberry Pi is quite limited. According to the Wiki page, the current limit for each I/O block (e. g...
ULINKpro Interface Schematic – Circuit Schematic
ULINKpro Interface Schematic
This interface schematic shows the JTAG, Serial Wire, and ETM interface circuits of ULINKpro. Use this schematic to analyze potential problems with the target h...
SB Midi Cable – Circuit Schematic
SB Midi Cable
The Sound Blaster MIDI port uses two pins from the 15 pin joystick port. These normally would be redundant +5 volt and ground lines. In the Sound Blaster, there...
USB Host and Device – Circuit Schematic
USB Host and Device
The DE2 board provides both USB host and device interfaces using the Philips ISP1362 single-chip USB controller. The host and device controllers are compliant w...
LCD Module – Circuit Schematic
LCD Module
The LCD module has built-in fonts and can be used to display text by sending appropriate commands to the display controller, which is called HD44780. Detailed i...
NTSC Video Using the 68HC908QY4 – Circuit Schematic
NTSC Video Using the 68HC908QY4
When configured as an input there is a more subtle problem. If the input has its pullup enabled it could affect the circuitry that is expecting to see an A/D in...
Sound Card Interfacing for RTTY PSK31 and SSTV – Circuit Schematic
Sound Card Interfacing for RTTY PSK31 and SSTV
The above circuit is recommended for use in SSTV applications with use of the sound card with a computer. This is the JVComm style of interface. This circuit ma...
coin operated computer – Circuit Schematic
coin operated computer
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Serial PCI Express Bus – Circuit Schematic
Serial PCI Express Bus
The PCI Express [PCIe] bus defines the Electrical, topology and protocol for the physical layer of a point to point serial interface over copper wire or optical...
Parallel Computer Bus Description and Pinout – Circuit Schematic
Parallel Computer Bus Description and Pinout
The IEEE-1284 bus defines a parallel printer bus specification with speeds above 1MBps. IEEE-1284 defines a Point-To-Point asynchronous bi-directional interface...
16 bit brain wave interface for ArduinoRaspberry Pi – Circuit Schematic
16 bit brain wave interface for ArduinoRaspberry Pi
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Parallel Port Break Out Board – Circuit Schematic
Parallel Port Break Out Board
Let me begin by saying I built my buffer board with a specific project in mind but I`d like to present it here as more of a general application devic.....
USB Data Acquisition – Circuit Schematic
USB Data Acquisition
The Universal Serial Bus (USB) has become a ubiquitous technology for computer peripherals. It is available on virtually every new computer and in most cases pr...
LCD displays easy to use and easy to build – Circuit Schematic
LCD displays easy to use and easy to build
Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "hear...
PIC USB Interface – Circuit Schematic
PIC USB Interface
The second program just sends "Hello world" to the PC. By default my board uses the Virtual COM Port (VCP) driver so you can view the output using Hyperterminal...
XA Single Board Computer – Circuit Schematic
XA Single Board Computer
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24C32 32K 5.0V I2C Smart Serial EEPROM – Circuit Schematic
24C32 32K 5.0V I2C Smart Serial EEPROM
This EEPROM programmer reads, writes and erases 24C EEPROM devices. It has a PC serial port interface. The programmer needs 5VDC power supply. It can read or wr...
USB Switch For Printers circuit – Circuit Schematic
USB Switch For Printers circuit
This circuit switches a printer s USB connection from a PC to a laptop. What was needed was a method of allowing a laptop to use the printer occasionally while ...
USB Printer Share Switch Circuit – Circuit Schematic
USB Printer Share Switch Circuit
This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. ...
Build your own PC interface – Circuit Schematic
Build your own PC interface
TNC and Modems ruled the world of digital communications until recently. With the advent of high speed computing and digital signal processing (DSP) all this ha...