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C program to read and write raw data on SD card – Circuit Schematic
C program to read and write raw data on SD card
Read and write the raw data from an SD card using just a computer (no microprocessor) forgetting the FAT32. I would like to do this in basic C. I can look at th...
Nathans Z80 Project Mark 2 – Circuit Schematic
Nathans Z80 Project Mark 2
The basic requirement was for some sort of output display and some sort of alpha-numeric input. So the simplest solution I could think of was a UART, attached t...
Ethernet Hardware Schematics – Circuit Schematic
Ethernet Hardware Schematics
The EtherSmart Wildcard is based on the Lantronix Xport Ethernet device server which is built into an RJ-45 connector housing. The XPort exchanges data via a se...
Keypad and LCD Display Module for Data Entry – Circuit Schematic
Keypad and LCD Display Module for Data Entry
Control your instrument with a 4x20 LCD display and 4x5 keypad designed for front panel feedback and control.....
usb switch schematic circuit – Circuit Schematic
usb switch schematic circuit
Anyone experimenting or developing USB ported peripheral hardware soon be comes irritated by the need to disconnect and connect the plug in order to reestablish...
start up aid for pcs – Circuit Schematic
start up aid for pcs
The older PC that concerned did have a standby state, but no matching BIOS set-ting that allows it to start up unattended. Although a +5 V standby supply voltag...
control interface via pc keyboard – Circuit Schematic
control interface via pc keyboard
One of the more difficult aspects when making a control or security system that uses a PC (a burglar alarm using a PC, for example), is the connection of the se...
always on for pcs circuit – Circuit Schematic
always on for pcs circuit
Many enthusiasts will be using their PCs as data loggers, controllers or as web servers. ln these cases it is important that the machine is kept powered up for ...
Hammond Commodore MIDI Interface – Circuit Schematic
Hammond Commodore MIDI Interface
Here is the schematic circuit board. Each switch puts out -2V when it`s on and 0V when it`s off. The four 4067 chips multiples the 64 switch signals into 4 sign...
Z80-Family Official Support Page – Circuit Schematic
Z80-Family Official Support Page
The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there ar...
PC-Midi Interface – Circuit Schematic
PC-Midi Interface
This design is for PC Soundcards obviously. If you need an interface for a Mac see my other page. For other computers and PCs without a soundcard you might take...
lf286 Linux USB LCD display with watchdog and buttons – Circuit Schematic
lf286 Linux USB LCD display with watchdog and buttons
This article is the result of the very positive feedback on the hardware articles that I have written so far. You LinuxFocus readers are really a great audience...
USB Switch For Printers – Circuit Schematic
USB Switch For Printers
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 ...
Hard Disk Switch – Circuit Schematic
Hard Disk Switch
In these times with viruses and other threats from the Internet it would be nice to have reassurance that the PC cannot be infected. That is why this circuit wa...
MAX3420 Maxim USB Peripheral Controller – Circuit Schematic
MAX3420 Maxim USB Peripheral Controller
The MAX3420 is a USB peripheral controller chip with an SPI bus. This page hopefully contains enough information to help you easily make use of the device in yo...
USB and GLCD Expansion Board for 8051SBC – Circuit Schematic
USB and GLCD Expansion Board for 8051SBC
The enable signal for USB chip and GLCD controller were made by PLD decoder from the address lines. As we have seen the memory map for i/o of 8051SBC board, the...
SPI-Flash Programmer 3.7 – Circuit Schematic
SPI-Flash Programmer 3.7
This SPI Flash Programmer can be used either for in-system programming or as a stand-alone serial flash programmer for the Atmel SPI programmable devices. The p...
SPI Interface Big 7-Seg LED – Circuit Schematic
SPI Interface Big 7-Seg LED
Easy build and use, the general purpose Big LED with SPI serial interfacing. Expandable for multiple digits but still uses only three wires for receiving data f...
Easy Debugging Terminal – Circuit Schematic
Easy Debugging Terminal
This LCD terminal provide two modes of operation by selecting jumper J1. When J1 is open the terminal operate as a normal ascii display terminal, when J1 is clo...
Hammond T-100/T-200/T-500 MIDIvice – Circuit Schematic
Hammond T-100/T-200/T-500 MIDIvice
A MIDI interface for an automatic accompaniment or controlling an MIDI expander. MIDIvice supports both manuals and has some nifty program features. It`s a MIDI...