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03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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ANALOG/DIGITAL CONVERSION sa DATA ACQUISITION & STORAGE sa DIGITAL AUDIO sa DIGITAL-TO-ANALOG CONVERTER (AUDIO) sa JOYSTICK x DIGITAL/ANALOG CONVERSION xx COMPUTER INPUT & OUTPUT xx DATA ACQUISITION & STORAGE xx DIGITAL ELECTRONICS Interfacing with an analog world. Part 1. How transducers work and some problems in processing their signals. Designing multichannel analog interfaces. Interfacing with an analog world. Part 2. Controlling small DC motors with analog signals. Use to make a computer-controlled lunar lander simulation model. A review of digital to analog conversion. Circuit for a 4 channel self-refreshing digital to analog converter. How to use BASIC to compute and represent waveforms through a converter using an oscilloscope as a display. Simulation of motion with computers. Part 1. An improved lunar lander algorithm. Circuit for an 8 channel 3.5-digit voltmeter built around the Motorola MC14433 3.5-digit analog-to-digital converter integrated circuit. Plugged into a minicomputer, it uses a simple program to display voltage readings on a video terminal. Simulation of motion with computers. Part 2. An automobile suspension systems response to a varying road surface is simulated by computer programs. Mind over matter. Add biofeedback input to your computer. Use muscle signals to produce computer input. A low-speed analog-to-digital converter for the Apple II. Tips on connecting a EMG (electromyogram) to a TRS-80 computer. A/D and D/A conversion, an inexpensive approach. Circuit for a fast converter which uses few parts and supplies 8 (or more) bits of resolution over a 5-volt range. Design and test microcomputer interfaces more easily by using the modules described here. They include D/A and A/D converters, data display and debouncing switches. Six-channel A/D converter reads positive voltages from 0 to 3 V, with either 8 or 10 bits of accuracy. It interfaces to a computer through an 8-bit bidirectional port. The variable-duty-cycle algorithm, a new and novel technique for handling data. BASIC program and simple circuit are used to provide a steady analog output voltage. Apple analog-to-digital converter built on an Apple II plug-in prototyping card. May be adapted to other computer systems. Est. cost: $81. Circuit for a D/A converter which fits the parallel port of an Apple II computer. Suitable for attaching a computer to a stereo amplifier for music/sound generation. Analog interfacing in the real world. Learn how to design and build economical analog interfaces. A high-resolution analog-to-digital converter for the TRS-80 reads 12 bits of data onto an 8-bit bus. Est. cost: $100. Circuit uses the 4051-type bilateral switch to select 1 of 8 analog data lines for input to a single-channel A/D converter. Personal computer signal processing. An introduction to transducers, interfacing, and system development. Planning a computerized measurement system. An introduction to the digital processing of analog signals. Laboratory data collection with an IBM PC. A versatile hardware/software combination. The analog-digital connection. A look at the relative merits of analog vs. digital electronics in the real world of data collection. Experimenting with Motorola's 68HC11 true single-chip computer. Part 6. SBC (single-board computer) applications. A look at MAG-11's binary output and how to use it A/D converter. Using the MAG-11 as a binary-display digital voltmeter and a bargraph photometer that measures foot-candles. What's your tenseness level. Connecting an interactive "Biobox" to a TRS-80 Color Computer enables you to experiment with biofeedback techniques. Est. cost: $15. A low-cost digital-to-analog converter for the TRS-80 computer converts digital data into ac waveforms. High-grade analog/digital and digital/analog converter for the Apple II computer. Part 1. Est. cost: $149. High-grade analog/digital and digital/analog converter for the Apple II computer. Part 2. Analog sensors for personal computers. How A/D converters work and tips on their use. Includes instructions for a "smart" light meter. Analog techniques for digital computers. Part 1. Analog computer basics. Analog techniques for digital computers. Part 2. Additional ways to develop programs that employ analog input methods similar to those of analog computers. Basics of data conversion. A simplified approach to analog/digital compatibility. Circuit uses the LM331 voltage-to-frequency converter chip. Used to convert DC control signals to TTL-compatible highly linear pulse train which is directly proportional to the input DC. Introduction to how an analog signal (DC voltage) can be transmitted as a digital signal (TTL pulses). Includes a zero-to-ten volt (1) voltage-to-frequency converter circuit and (2) frequency-to-voltage converter circuit. Build a high-speed digital-to-analog converter with as many as eight independent channels. Connects to a standard PC parallel printer port. Electronics theory for everyone. Analog-to-digital converters. Eight-channel analog-to-digital converter. Breadboard project uses eight phone jacks to attach the temperature-sensing probes described in this article. PC-based test bench. Part 3. Interface to receive and send both analog and digital signals. Features 24-bit digital I/O, 8 channels of 8- or 12-bit A/D conversion, and a single 8-bit D/A conversion. Est. cost: $159 (kit) Temperature sensing. How a simple and accurate temperature sensor can be built. How to interface and control it with a computer. Includes software for controlling, calibrating and running the thermometer. Software is for the SWTP 6800 microcomputer, but can be adapted. The amazing 1802. Some D/A and A/D applications. How to interface the COSMAC Elf II microcomputer to the analog world. How to calibrate the Cromemco D+7A (seven channel A/D and D/A) using a potentiometer and two D-cells. Also includes a circuit fix to generate an inverted PHLDA signal if your computer does not produce that signal. Analog and digital interfaces. How they work and how to apply them. Part 1. Theory of A/D and D/A conversion and a look at the Cromemco D+7A I/O board. Analog and digital interfaces. Part 2. Practical applications. Analog-to-digital converter for a COSMAC 1802 computer. Detects voltages from 0 to 5 volts and outputs a hex number (00,10,20,...F0) depending on the voltage. Estimated cost: $5. Inexpensive A/D converter uses serial-polling technique and does not require a multiplexer. Circuit and software for monitoring a thermistor (thermostat) are described. Operates on 8080 computer. A/D converter design for the TRS-80 Level II computer. Read voltages from 0 to +10 volts and display the results on the video monitor. Profile of the AD-68 analog-to-digital converter from Innovative Technology for use with the SWTP 6800 computer. Analog-to-digital converter interface is used to monitor the temperature via a MEK6800D2 computer kit. Includes 6800 assembly language program to record and display present, high, and low temperatures. Multiple control with the multifaceted H8. Build this multichannel A/D converter. Includes software driver written in BASIC. The data grabber. Construct this A/D converter for measurement and control applications. Monitors up to 16 analog input lines. Get on the PET instrument bus. An easy machine-language implementation of the IEEE 488 (GPIB) bus via SRQ line interrupts. How to cope with an analog world. This successive approximation register helps you better understand analog-to-digital conversion. "Lie Detector" interface and software for an Apple computer. Attach a Radio Shack psychogalvanometer to a computer cassette port and measure the frequency output. Fast, but inexpensive, multichannel analog-to-digital converter. A/D converter program for an Apple II computer allows the computer to capture rapidly changing dc voltages and display the resultant plot on the video screen. Heath H8 computer assembly-language program which runs with an interface to measure the intervals between neural discharges in the human brain. Includes the schematic for the interface. Look at that sound. Transform the sounds of earthquakes, handclaps, etc. into photographs using an oscilloscope and a Cromemco D+7A A/D converter. Hook up your PET computer to the world with this digital-voltmeter interface which lets you monitor and record readings from outside devices. Est. cost: $5. Circuit for an inexpensive A/D converter for an Apple II computer. Allows the Apple II computer to function as an oscilloscope. Est. cost: $6. Using voltage comparators. A hands-on look at the popular and readily available LM339 which features four separate comparators in a single 14-pin DIP. Used in circuits to convert from analog-to-digital, monitor voltage levels, convert from one logic family to another, etc. Simulating the human brain using CMOS inverters. Circuits include a novel "neuron-like" A/D converter. Fundamentals of analog-to-digital (A/D) converters. Analog acquisition unit lets a computer store, compare, plot and analyze data from your experiments and circuits. Est. cost: $69. Fundamentals of digital-to-analog (D/A) converters. Analog-to-digital (A/D) conversion at video speeds is facilitated by two converter ICs. Tips on using these new chips for computerized-image capturing and digital TV signal processing. Surface-mount-device circuits: A design and construction guide. Projects include using SMCs (surface-mountable components) to produce a subminiature LED tone transmitter, A/D converter LED bargraph or metering circuit, and light-sensitive oscillator (probe). Measure voltage using a personal computer by adding a voltage-to-frequency converter onto an input port line. Delta modulation: The forgotten A/D converter. A close examination of this often-overlooked bandwidth-compression circuit for use in telephone, cable-TV and digital data-recording. Interfacing Commodore's user port. Using a low-cost serial A/D converter chip and some simple software, you can use your C-128, C-64 or VIC-20 personal computer to monitor real-world analog events. "Flash" or "video-speed" analog-to-digital converter ICs. Includes a circuit for sampling rates of up to 30 MHz. An in-depth look at the DAC-8143 a 12-bit serial-input CMOS digital-to-analog converter chip. Analog-to-digital converters that use a technique called successive approximation. Simple digital-to-analog converter circuit. Circuit for a digital-to-analog converter uses COSMOS inverter. The hows and whys of digital-to-analog and analog-to-digital converters. A review of new devices and circuits which reduce complexity and lower cost in interfacing analog and digital signals. Digital to analog converters. Part 1. How an R-2R resistor ladder network can be used as a rudimentary D/A converter. Digital to analog converters. Part 2. Expanding the circuit in part 1 to a full-fledged D/A converter. Build a low-cost A/D converter that works with any 8-bit computer. Can accept up to four channels of analog data, spanning from 0 to +2 volts dc, and change this information into 3.5 digits of BCD data. Includes software listings for 8080, 2650 and 6800 microprocessors. Est. cost: $30. Analog to digital converters. Part 1. Several ways of converting analog information plus a homebrew parallel or flash A/D converter made from a voltage divider and a series of capacitors. Analog to digital converters. Part 2. A simple op-amp sample and hold circuit is one way to interface microprocessors with the outside world of analog signals. Circuits for voltage-to-frequency converters using some new monolithic IC's (Teledyne 9400 and National LM331). Frequency-to-voltage converter circuits. A description and typical applications of the LM339 quad comparator integrated circuit chip, including analog-to-digital interface, CMOS to TTL translation, and monostable oscillator. A low-cost A/D converter uses "current mirrors" instead of conventional op amps. Analog-digital converter for TRS-80 interfacing. Build an 8-bit, 8-channel digital circuit that allows you to connect analog voltages to a TRS-80 computer. Expandable to 32 channels. Processing analog signals for digital systems. How to create interfaces between the analog and digital world. Digital electronics course. Digital-to-analog conversion. Digital electronics course. Getting familiar with A/D (analog-to-digital) converters. Digital electronics course. Getting familiar with A/D converters. Phase-locked loops and how to take advantage of these powerful but easy-to-use devices. An introduction to analog-to-digital converters. A low-cost analog-to-digital converter for your PC lets it function as a data-acquisition tool. Transducer circuits to measure temperature, light intensity, and heart-beat are included. Est. cost: $30. Build an eight-channel analog-to-digital converter to interface your computer with the physical world. Est. cost: $25 (kit). Also includes instructions for building temperature probes. Sixteen channel analog multiplexer/demultiplexer circuit uses a CMOS device. Universal sensor interface connects to your PC's parallel printer port and enables you to excite, control, and read inputs from a wide variety of sensors (temperature, pressure, humidity, etc.). This device is built around eight-channel, 12-bit analog-to-digital and digital-to-analog converters. Est. cost: $59 (kit). Circuit for a digital-to-analog converter using the RCA CA3160 as a voltage follower. Interfacing an analog-to-digital converter to an 8080-based microcomputer, plus typical software to service an A/D interrupt. A D/A conversion circuit uses an 8080 microprocessor, a DAC-08E digital-to-analog converter and a CMP-01C comparator. Includes the 16 instruction 8080 assembly language program. Convert analog input, such as voice input, to digital output by using a new Motorola IC which performs the modulation and demodulation functions of a CVSD (continously variable slope delta). Includes a schematic of a simple voice CVSD. Data acquisition for microcomputers. Software for 8080 illustrates a typical input routine for a 10 bit analog-to-digital converter. How to interface an 8085 microcomputer with an A/D converter so that eight analog channels can be monitored. Part 1. Use of I/O ports and programmable timer. How to interface an 8085 microcomputer with an A/D converter so that eight analog channels can be monitored. Part 2. A look at the software required to control the monitor. Versatile analog interface for your computer. Build this device to look at outside world without complex analog-to-digital conversion. Applications include a capacitance meter, proximity switch, and joystick interface. How to connect an A/D converter to a microprocessor. How to connect a D/A converter to a microprocessor. Two methods for interfacing are shown. D/A converter applications. A closer look at a digital-to-analog converter and its applications. Build this biofeedback monitor for your TRS-80 Model I or Model III computer. All about analog-to-digital converters. How they work and how to connect them to a microprocessor. 10-bit floating point A/D converter circuit is very easy to interface to an Apple IIe, IIgs, or any other personal computer or microprocessor. Uses the Linear Technology LTC1092 IC. A/D and D/A conversion fundamentals. Build a digital-to-analog converter. Digital output from a standard parallel printer port is converted to an electrical current whose value varies according to the digital values. Simple circuit to boost low analog signals prior to reaching an A-to-D converter. This amplifier will give a gain of 10 with an input impedance of over a megohm. Voltage-to-frequency (V/F) converter chips. How they function and can be used as an alternative to A/D and D/A converters. Analog-to-digital and digital-to-analog converters. Discover the basics of the most widely used D/A and A/D conversion techniques. Experimenting with PC-based test equipment. Part 4. Low-cost analog-to-digital converter interface that allows you to measure temperature, displacement, audio signals, and any other 0-5 volt analog signal. Also includes construction of an accurate temperature sensor. Est. cost: $40 (kit). Experimenting with PC-based test equipment. Part 5. Add a variety of analog inputs to the PC-based analog-to-digital converter. Looks at mechanical sensing, electrical sensing, and acoustic sensing. The Exar XR-4151 chip converts an applied DC voltage to a pulse output that has a repetition frequency proportional to the DC voltage. Also convert square-wave or pulse input to DC. Use in A/D and D/A conversion and data transmission. Use your computer as a high-speed oscilloscope. How to build an inexpensive analog-to-digital converter. | |||||||||
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