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Control 32 DAC channels via a parallel port – Circuit Schematic
Control 32 DAC channels via a parallel port
The circuit in Figure 1 controls 32 voltage-output channels from the parallel port of a PC. The circuit comprises eight DAC7615 quad voltage-output, serial-data...
PC Controlled Voltage or Current Source – Circuit Schematic
PC Controlled Voltage or Current Source
This project was begun as a means to charge and cycle NiCad batteries but has become a versatile tool for experiments requiring either a controlled voltage up t...
circuits and programs to show how to use PC parallel port output – Circuit Schematic
circuits and programs to show how to use PC parallel port output
PC parallel port can be very useful I/O channel for connecting your own circuits to PC. The PC`s parallel port can be used to perform some very amusing hardware...
PC Printer Port Controls I-V Curve Tracer – Circuit Schematic
PC Printer Port Controls I-V Curve Tracer
This article describes an I-V curve tracer circuit that uses a computer for display and control. The circuit is controlled via the PC parallel port. Software is...
Simple PC smartcard reader – Circuit Schematic
Simple PC smartcard reader
This simple PC Smartcard reader was shown in Electronics Design magazine February 17, 1997 issue on page 172 in the ideas for design section. The circuit is des...
Using the joystick port as general purpose input – Circuit Schematic
Using the joystick port as general purpose input
The joystick button inputs can be used as general purpose button or switch inputs, and can also be driven by logic level signals or by open collector or open dr...
Laptop Computer Serial Port Power Booster – Circuit Schematic
Laptop Computer Serial Port Power Booster
If you are looking at this page, you probably feel like I did when I tried to run a self-powered PIC programmer with my notebook computer. Yes, the serial port ...
Microprocessor RS-232 Reset – Circuit Schematic
Microprocessor RS-232 Reset
This circuit allows a remote microprocessor to be reset by a controlling host over a remote RS-232 or similar protocol serial line. With the use of a program lo...
Hot Swapping the PCI Bus – Circuit Schematic
Hot Swapping the PCI Bus
The circuitry for a hot swappable PCI slot on a motherboard or backplane is shown in Figure 1. The power supplies for each PCI slot are controlled by an LTC1421...
Centronics port D/A converters and low-pass filter – Circuit Schematic
Centronics port D/A converters and low-pass filter
I keep all rights to those circuits myself. You may freely build those circuits to yourself and your friends, but commercial use of those circuits is not allowe...
TWO TRANSISTOR RS232 TO DREAMCAST CONVERTER – Circuit Schematic
TWO TRANSISTOR RS232 TO DREAMCAST CONVERTER
A simple circuit to connect the Dreamcast console to PC. No MAXxxx IC required. Only a few discrete components. This circuit is a direct replica of the daVinci ...
Interface between Ericsson 6xx/7xx phones and a PC – Circuit Schematic
Interface between Ericsson 6xx/7xx phones and a PC
This is one of the ways to build an interface between an ericsson 6xx/7xx phone and a PC serial port. This particular interface uses the phone battery as a powe...
Convert Atari-style joystick to PC joystick port – Circuit Schematic
Convert Atari-style joystick to PC joystick port
Some games are easier to play with digital joystick instead of analogue type. Unfortunately PC has only analogue joystick connector, which makes it impossible t...
Control Electrical Appliances Using PC Circuit – Circuit Schematic
Control Electrical Appliances Using PC Circuit
Here is a circuit for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the g...
18-bit ADC uses PC`s serial port – Circuit Schematic
18-bit ADC uses PC`s serial port
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...
24-bit parallel port interface with 8255 – Circuit Schematic
24-bit parallel port interface with 8255
If you are searching for the 8255 datasheet, click here. Another project describing the 8255 interface to PC is here....
7 segment rolling display using PC – Circuit Schematic
7 segment rolling display using PC
It is very interesting and convenient to be able to control everything while sitting at your PC terminal. Here, a simple hardware circuit and software is used t...
AIU - Analog Interface Unit – Circuit Schematic
AIU - Analog Interface Unit
The Analog Interface Unit (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software...
Aladin – Circuit Schematic
Aladin
Whoever thinks about reproducing an interface for the Aladin, should first of all be aware of the fact that there are two different versions of the interface. T...
PC Serial Port Receiver – Circuit Schematic
PC Serial Port Receiver
This circuit was designed to control a 32 channel Christmas light show from the PC serial port. Originally designed with TTL logic, it has been simplified using...