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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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