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Stepping Motor Driver - Minimalist circuit uses one CMOS gate and is reversible

Sound Blaster Preamp - Fixes that well known problem and needs no batteries

NullModem 9-9pin (COM-COM)

Serial (COM) to PS/2 Mouse Adapter

PS/2 to Serial (COM) Mouse Adapter

LapLink/InterLink Parallel Cable

IDE

NullModem 9-25pin (COM-COM)

NullModem 25-25pin (COM-COM)

Computer power supply 2

Computer power supply 1

Service manual printer SCR2438E

Service manual printer SCR3232E

Service manual printer SAMSUNG ML-5000

Service manual printer STAR LC-1511

Service manual printer STAR NX-2415II

Service manual printer STAR NX-1500 (STAR LC-15)

Service manual printer STAR XR-1000

Service manual printer EPSON Stylus Color 700 EPSON Stylus Color EX

Service manual printer EPSON EPL- 5700L/ 5700i

Service manual printer EPSON Stylus Color 400

Service manual printer EPSON COLOR INKJET PRINTER Stylus-600

Service manual printer EPSON COLOR INKJET PRINTER Stylus-500

Service manual printer EPSON Stylus Color 300

Service manual printer EPSON TERMINAL PRINTER Stylus 1000

Service manual printer EPSON Stylus Color 440

Service manual printer EPSON DFX 8000

Service manual printer EPSON LQ-570, LQ-580

Service manual printer EPSON LQ-670

Service manual printer EPSON LQ-1050

Service manual printer EPSON LQ-570+1070

Service manual printer EPSON LQ-300

Service manual printer EPSON LX-300

Service manual printer EPSON LX-300+

Service manual printer HP LJ 1100

Service manual printer Panasonic kx-p6500

Service manual printer Panasonic kx-p1150

IRDA

UNIPOLAR STEPPER MOTOR CONTROL CIRCUIT. This circuit controls a small, four-phase, five-wire, unipolar stepper motor, commonly designated the "KP4M4-001." This type of motor was used in many 5 1/4" floppy disk drives in older computers. Now obsolete, such disk drives are often available on the surplus market for a small fraction of the motor's original cost. The stepper motors are easy to extract from the drives, and are ideal for many applications. This arrangement was used in the scale model of a RADAR set to control the position of a miniature parabolic antenna. (Note that some 5 1/4" floppy disk drives used a four-wire "bipolar" motor, which is not compatible with this circuit.)

BIPOLAR STEPPER MOTOR CONTROL CIRCUIT. In this circuit, a potentiometer controls both the speed and direction of a small bipolar stepping motor like those found in many 5 1/4" floppy disk drives. Note that the bipolar motors are distinguished from "unipolar" types, in that bipolar units have two coils instead of four, and four wires instead of five. With the potentiometer at the extreme counterclockwise position, the motor runs counterclockwise at the maximum speed. Rotating the potentiometer toward the center slows the motor, until it stops. Continuing potentiometer rotation clockwise, the motor starts to run clockwise, increasing in speed to the maximum clockwise position.

MIDI Interface for Soundblaster compatible cards

Stereo Audio mini MIXER MIC-LINE for PC Audio Card

Modem Rockwell RCV336/ACF model V1433VQR ext.

Modem Rockwell model 4A144IM int

Seiko EPSON - Scanners - Users' Manual in PDF format: GT - 5000, GT - 8500, GT - 9500, GT - 10000, GT - 12000, Perfection 610, Perfection 640u, Perfection 1200u, Perfection 1240u, Perfection 1640u, Expression 1600, FilmScan 200.

Users' Manual printers Seiko EPSON in PDF and MS Word formats: EPL-5700, DFX-8500, FX-2180, FX - 880 \ FX - 1180, Stylus PHOTO 700, Stylus PHOTO EX, Stylus COLOR 850, Stylus COLOR 850 (in Russian), DFX - 8000, EPL - 3000, EPL - 5000, EPL - 9000, LQ - 570, LX - 300, Stylus 1000, Stylus - 800, Stylus COLOR, Stylus COLOR 400, Stylus COLOR 600, Stylus COLOR 800, TM - 290II, TM - 300, TM - 930II, TM U-370.

Service Manuals printers Star Micronics in PDF format: AR1000, ASF, LC100P, LC1511, LC240, LC4511, LC7211, LC8021, LC8211PT, LC8211, LC8521, LC90, LS04, LS05, LS08PL, NX1000, NX1001, NX1020, NX1040, NX1500, NX2400, NX2415, NX2415PL, NX2420, NX2430, NX2440, NX2450, NX2480, PR811P, SJ144, SJ48, VS12PL, WIN4, WIN800, XB2410PL, XB2410PL, XB2410PL, XB2420, XB24252T, XR1000PL, XR1020.

Parallel port dongle (12C508A) By using the PIC 12C508 MCU from Microchip, we can make a cheap and simple hardware protection key (dongle).

Light show. Computer parallel port can be used for many purposes. One of them could be user circuit control, for example light effect.

Virtual Frequency Meter

IRPR/CENTRONICS Convertor

Modem AT Command Set

SDSL Chip Set. xDSL- chip set's

Ethernet Chips

24-bit parallel port interface with 8255 (Commodore projects)

Audio-video switch. This is an 8-input x-output audio/video switch module to be controlled from a computer, for example from the parallel port.

HWB (Hardware Book) by (C) Joakim Ogren (Connectors, Cables, Adapters, Circuits)

PIP Programmer (PROCheap)

ProFLASH. (Atmel Flash Micro Programmer) by Peter Dannegger

PIC 16C84 Serial mode programmer.

Basic PIC 16C84 programmer for PC parallel port by David Tait

Programmer. ProPIC. version 3.0. Soft

Programmer. ProPIC. version 3.0. Schematics

Programmer. ByteBlasterMV. For Alter chips. (3.5k)

Programmer. ByteBlaster. For Alter chips. Schematics (3.5k)

Simple Programmer. AVRProg. for 1200 series (23k)

Programmer. PICProg by Bryan J. Rentoul. Version 3.0. Schematics+documentation. (50k)

Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Software. part 3

Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Schematics. part 2

Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Schematics. part 1

Programmer. Turbo 6. adapter M.

Programmer. Turbo 6. adapter K.

Programmer. Turbo 6. schematics (390k)

Programmer. Turbo 6. soft version 6.67 (180k)

Programmer. Turbo 6. soft version 6.67 (190k)

Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part4) (194k)

Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part3) soft (15k)

Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part2) (277k)

Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part1) schematics (160k)

Upgrade cga/ega monitors to vga/svga

Midi-keybord

Midi adapter for soundcard, with indicators. by george shepelev 2:461/124@fidonet

Lpt to lpt

IBM PC joystick

Unilogic v1.42- "realtime" oscilloscope, frequency meter (LPT)

Midikeyb

Baycom Terminal Diagram (modem)

K7SZL'S BASIC+ HAMCOMM Interface

SSTV modems

HammComm 3.0 (Comparator) Receive Circuit also for use with JVFAX and PKTMON- WB5NBQ

Sound Card Interfacing for RTTY, PSK31, and SSTV

Understanding Computer Technology (Joke)

Frequency Measurements Using PC

Computerised Morse code generator/transmitter

PcGenerator. Turn your PC into a low frequency signal generator. Frequency range from 0.5-25000 Hz

Power supply unit Scheme XT/AT (scheme and description) (variant 2)

Scheme and power supply unit description XT/AT (variant 1)

24 Line Parallel Interface for the PC (540k) Based on the older 8255A, this simple parallel interface provides 24 I/O lines.

Computer Speaker Amplifier (12k) This three-transistor amplifier delivers about 2 watts to an 8 ohm speaker.

Digital to analogue converters for PC parallel port

RS-232 serial line surge protectors

Simple RS-232 serial port buffer circuit

Parallel port interfacing made easy

Simple MIDI tester

VGA converter for video projectors and fixed frequency monitors

VGA to TV converter

Control 120VAC relay with TTL

32 Bit Serial Receiver (57.6 K Baud TTL & CMOS)

Computerize Your Room/Home

Driving a relay with a CPU

Build logic gates using discrete parts

Filtering PC bus POWER

More accurate PC/AT clock

Analog Signal Acquisition for PC Printer Port

Joystick Interface Projects

Computer controlled IR device (hardware/software)

Drawing power from a PC Serial port

Parallel (Printer) Port Interface

Joystick Interfaces

Get power out of PC parallel port

Get power out of PC RS-232 port

How to get power from PC to your circuits

Joystick port interface projects

1 Second Time Base From Crystal Osc.

Parallel Port Relay Interface Circuit

32 Bit Serial Receiver (57.6 K Baud TTL & CMOS)

16 Bit PC Serial Port Receiver (CMOS)

Simple printer emulator adapter

Use disk drive motors in our projects

Midibox 64

I2C printer port adaptor

RS232C Level Converter

Isolated Full Duplex RS232C Interface

DB-9 Connector to DB-25 (both RS-232)

Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25

Modem Rockwell RCV336/ACF model V1433VQR ext.

Genius Mouse schematics

EEPROM programmer

Commodore 64 24-bit parallel port interface with 8255

Sound Card Interface with Tone Keyer

RGB oo Monochrome converter - Matches impedance of PC to CCTV monitor

Ericsson phone to PC serial port interface

PC serial port receiver

Parallel port relay interface

ISA 48 I/O digital card

PC infrared iRDA interface using TFDS 4500

Jupiter card programmer

USB to RS232 Dongle

Parallel (Printer) Port Interface

RS-232 line monitor and loopback cables

The KD2BD Pacsat Modem

A Serial Infrared Remote Controller

PC Serial and Parallel Port Software and Interfaces

Interfacing 16x2 character :LCD to parallel port

RS-232 Protocol Analyser

Interface cable for Casio QV-200 digital camera

A PC-Based LowFER Frequency Synthesizer

Power from RS-232 port

PCI to ISA converter

WatchDog for ISA Bus

4-channel 8-bit analog-to-digital converter for PC

Printer port ADC

Parallel port ADC based on MAX147

Analog Signal Acquisition for PC Printer Port

More accurate PC/AT clock

Getting power from RS-232 interface

Barcode scanner

Build your own iRDA SIR Transceiver (Dongle) using MCP2120

PC thermometer

Dive computer interface

Parallel port servo controller

GPS receiver (Gamin, Eagle etc) to PC interface cables

Connect two CD-ROM drives to one soundcard

Headphone driving circuit for soundcards

Get power out of PC parallel port

Null Printer Adapter

PC speaker volume control circuit

How to get power from PC to your circuits

RS-232 surge protection

Simple RS-232 serial port buffer circuit

Get power out of PC RS-232 port

Sound Blaster Microphone Preamplifier

Sega 3D glass interfacing circuits

Convert Atari-style joystick to PC joystick port

Fake Joystick circuit

Using the joystick port as general purpose input

Connect other circuits to PC joystick port

Schematic of a standard PC joystick

Simple PC SmartCard reader

Fax to modem interface

PC interface for point controller

Linux Infra-red Remote Control (LIRC)

Homebuilt RS232 LCD Interface

Compter microphone

Laptop Computer Serial Port Power Booster

Assorted computer interface circuits

HamComm Interface

Apple II/II+/IIe IDE Drive Interface

Basic Stamp I & PC Relay Controller

Hi-Fi PC Speaker System

IDE hard-disk interface for Amiga 500

How to construct Garmin GPS receiver interface cables

iRDA printer adapter

160 Baud ALDL Hardware Interface

AT PC Power Supply 1

AT PC Power Supply 2

AT PC Power Supply 3

AT PC Power Supply 4

AT PC Power Supply 5

iLINK Interface

Digital Signals Decoding Interfaces

9-pin null modem cable

RS232 - Lowe HF-225 interface

RS232 to IrDA convertor using Vishay TOIM3232

Interfacing PC sound card to SSB rig

24-line PC digital interface (PDF)

Analogue to digital converter for PC serial port

Get power out of PC RS-232 port

RS-232 surge protection

Digital to analogue converters for PC parallel port

Get power out of PC parallel port

Parallel port interfacing made easy

Simple printer emulator adapter

Connect two CD-ROM drives to one soundcard

Headphone driving circuit for soundcards

Simple MIDI tester

Sound Blaster Microphone Preamplifier

VGA converter for video projectors and fixed frequency monitors

VGA to TV converter

PC speaker volume control circuit

Sega 3D glass interfacing circuits

Alternative PC-Mouse


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