Computer circuit

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View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Computer/index.html




1 Second Time Base From Crystal Osc.
16 Bit PC Serial Port Receiver (CMOS)
160 Baud ALDL Hardware Interface
24 Line Parallel Interface for the PC (540k) Based on the older 8255A, this simple parallel interface provides 24 I/O lines.
24-bit parallel port interface with 8255 (Commodore projects)
24-line PC digital interface (PDF)
32 Bit Serial Receiver (57.6 K Baud TTL & CMOS)
32 Bit Serial Receiver (57.6 K Baud TTL & CMOS)
4-channel 8-bit analog-to-digital converter for PC
9-pin null modem cable
A PC-Based LowFER Frequency Synthesizer
A Serial Infrared Remote Controller
Alternative PC-Mouse
Analog Signal Acquisition for PC Printer Port
Analog Signal Acquisition for PC Printer Port
Analogue to digital converter for PC serial port
Apple II/II+/IIe IDE Drive Interface
Assorted computer interface circuits
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
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.
Barcode scanner
Basic PIC 16C84 programmer for PC parallel port by David Tait
Basic Stamp I & PC Relay Controller
Baycom Terminal Diagram (modem)
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.
Build logic gates using discrete parts
Build your own iRDA SIR Transceiver (Dongle) using MCP2120
Commodore 64 24-bit parallel port interface with 8255
Compter microphone
Computer controlled IR device (hardware/software)
Computer power supply 1
Computer power supply 2
Computer Speaker Amplifier (12k) This three-transistor amplifier delivers about 2 watts to an 8 ohm speaker.
Computerised Morse code generator/transmitter
Computerize Your Room/Home
Connect other circuits to PC joystick port
Connect two CD-ROM drives to one soundcard
Connect two CD-ROM drives to one soundcard
Control 120VAC relay with TTL
Convert Atari-style joystick to PC joystick port
DB-9 Connector to DB-25 (both RS-232)
Digital Signals Decoding Interfaces
Digital to analogue converters for PC parallel port
Digital to analogue converters for PC parallel port
Dive computer interface
Drawing power from a PC Serial port
Driving a relay with a CPU
EEPROM programmer
Ericsson phone to PC serial port interface
Ethernet Chips
Fake Joystick circuit
Fax to modem interface
Filtering PC bus POWER
Frequency Measurements Using PC
Genius Mouse schematics
Get power out of PC parallel port
Get power out of PC parallel port
Get power out of PC parallel port
Get power out of PC RS-232 port
Get power out of PC RS-232 port
Get power out of PC RS-232 port
Getting power from RS-232 interface
GPS receiver (Gamin, Eagle etc) to PC interface cables
HamComm Interface
HammComm 3.0 (Comparator) Receive Circuit also for use with JVFAX and PKTMON- WB5NBQ
Headphone driving circuit for soundcards
Headphone driving circuit for soundcards
Hi-Fi PC Speaker System
Homebuilt RS232 LCD Interface
How to construct Garmin GPS receiver interface cables
How to get power from PC to your circuits
How to get power from PC to your circuits
HWB (Hardware Book) by (C) Joakim Ogren (Connectors, Cables, Adapters, Circuits)
I2C printer port adaptor
IBM PC joystick
IDE
IDE hard-disk interface for Amiga 500
iLINK Interface
Interface cable for Casio QV-200 digital camera
Interfacing 16x2 character :LCD to parallel port
Interfacing PC sound card to SSB rig
IRDA
iRDA printer adapter
IRPR/CENTRONICS Convertor
ISA 48 I/O digital card
Isolated Full Duplex RS232C Interface
Joystick Interface Projects
Joystick Interfaces
Joystick port interface projects
Jupiter card programmer
K7SZLS BASIC+ HAMCOMM Interface
LapLink/InterLink Parallel Cable
Laptop Computer Serial Port Power Booster
Light show. Computer parallel port can be used for many purposes. One of them could be user circuit control, for example light effect.
Linux Infra-red Remote Control (LIRC)
Lpt to lpt
Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
Midi adapter for soundcard, with indicators. by george shepelev 2:461/124@fidonet
MIDI Interface for Soundblaster compatible cards
Midi-keybord
Midibox 64
Midikeyb
Modem AT Command Set
Modem Rockwell model 4A144IM int
Modem Rockwell RCV336/ACF model V1433VQR ext.
Modem Rockwell RCV336/ACF model V1433VQR ext.
More accurate PC/AT clock
More accurate PC/AT clock
Null Printer Adapter
NullModem 25-25pin (COM-COM)
NullModem 9-25pin (COM-COM)
NullModem 9-9pin (COM-COM)
Parallel (Printer) Port Interface
Parallel (Printer) Port Interface
Parallel port ADC based on MAX147
Parallel port dongle (12C508A) By using the PIC 12C508 MCU from Microchip, we can make a cheap and simple hardware protection key (dongle).
Parallel port interfacing made easy
Parallel port interfacing made easy
Parallel port relay interface
Parallel Port Relay Interface Circuit
Parallel port servo controller
PC infrared iRDA interface using TFDS 4500
PC interface for point controller
PC Serial and Parallel Port Software and Interfaces
PC serial port receiver
PC speaker volume control circuit
PC speaker volume control circuit
PC thermometer
PcGenerator. Turn your PC into a low frequency signal generator. Frequency range from 0.5-25000 Hz
PCI to ISA converter
PIC 16C84 Serial mode programmer.
PIP Programmer (PROCheap)
Power from RS-232 port
Power supply unit Scheme XT/AT (scheme and description) (variant 2)
Printer port ADC
ProFLASH. (Atmel Flash Micro Programmer) by Peter Dannegger
Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part1) schematics (160k)
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. (part3) soft (15k)
Programmer. BiDiPro. version 1.2a. Produced by Eduard Panchenko. Design & PCB routing by P.E.co. (part4) (194k)
Programmer. ByteBlaster. For Alter chips. Schematics (3.5k)
Programmer. ByteBlasterMV. For Alter chips. (3.5k)
Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Schematics. part 1
Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Schematics. part 2
Programmer. ComPIC. 16C61/62x/71x/8x/64/65/74, 14000. Software. part 3
Programmer. PICProg by Bryan J. Rentoul. Version 3.0. Schematics+documentation. (50k)
Programmer. ProPIC. version 3.0. Schematics
Programmer. ProPIC. version 3.0. Soft
Programmer. Turbo 6. adapter K.
Programmer. Turbo 6. adapter M.
Programmer. Turbo 6. schematics (390k)
Programmer. Turbo 6. soft version 6.67 (180k)
Programmer. Turbo 6. soft version 6.67 (190k)
PS/2 to Serial (COM) Mouse Adapter
RGB oo Monochrome converter - Matches impedance of PC to CCTV monitor
RS-232 line monitor and loopback cables
RS-232 Protocol Analyser
RS-232 serial line surge protectors
RS-232 surge protection
RS-232 surge protection
RS232 - Lowe HF-225 interface
RS232 to IrDA convertor using Vishay TOIM3232
RS232C Level Converter
Schematic of a standard PC joystick
Scheme and power supply unit description XT/AT (variant 1)
SDSL Chip Set. xDSL- chip sets
Sega 3D glass interfacing circuits
Sega 3D glass interfacing circuits
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.
Serial (COM) to PS/2 Mouse Adapter
Service manual printer EPSON COLOR INKJET PRINTER Stylus-500
Service manual printer EPSON COLOR INKJET PRINTER Stylus-600
Service manual printer EPSON DFX 8000
Service manual printer EPSON EPL- 5700L/ 5700i
Service manual printer EPSON LQ-1050
Service manual printer EPSON LQ-300
Service manual printer EPSON LQ-570+1070
Service manual printer EPSON LQ-570, LQ-580
Service manual printer EPSON LQ-670
Service manual printer EPSON LX-300
Service manual printer EPSON LX-300+
Service manual printer EPSON Stylus Color 300
Service manual printer EPSON Stylus Color 400
Service manual printer EPSON Stylus Color 440
Service manual printer EPSON Stylus Color 700 EPSON Stylus Color EX
Service manual printer EPSON TERMINAL PRINTER Stylus 1000
Service manual printer HP LJ 1100
Service manual printer Panasonic kx-p1150
Service manual printer Panasonic kx-p6500
Service manual printer SAMSUNG ML-5000
Service manual printer SCR2438E
Service manual printer SCR3232E
Service manual printer STAR LC-1511
Service manual printer STAR NX-1500 (STAR LC-15)
Service manual printer STAR NX-2415II
Service manual printer STAR XR-1000
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.
Simple MIDI tester
Simple MIDI tester
Simple PC SmartCard reader
Simple printer emulator adapter
Simple printer emulator adapter
Simple Programmer. AVRProg. for 1200 series (23k)
Simple RS-232 serial port buffer circuit
Simple RS-232 serial port buffer circuit
Sound Blaster Microphone Preamplifier
Sound Blaster Microphone Preamplifier
Sound Blaster Preamp - Fixes that well known problem and needs no batteries
Sound Card Interface with Tone Keyer
Sound Card Interfacing for RTTY, PSK31, and SSTV
SSTV modems
Stepping Motor Driver - Minimalist circuit uses one CMOS gate and is reversible
Stereo Audio mini MIXER MIC-LINE for PC Audio Card
The KD2BD Pacsat Modem
Understanding Computer Technology (Joke)
Unilogic v1.42- realtime oscilloscope, frequency meter (LPT)
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 motors original cost.
Upgrade cga/ega monitors to vga/svga
USB to RS232 Dongle
Use disk drive motors in our projects
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.
Using the joystick port as general purpose input
VGA converter for video projectors and fixed frequency monitors
VGA converter for video projectors and fixed frequency monitors
VGA to TV converter
VGA to TV converter
Virtual Frequency Meter
WatchDog for ISA Bus




View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Computer/index.html