Data Logging / Acquistion Circuits #-D


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Data Logging / Acquisition Circuits Page 1b
Data Acquisition / Logging: #-C D-K L-S T-Z
Last Updated on: Friday, August 29, 2008 02:34 PM

Circuits Designed by Dave Johnson, P.E. :

AUDIO FREQUENCY DIGITAL NOISE GENERATOR
When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. I included a level control pot.

C-MOS INVERTER MAKES LOW POWER AMP
With the addition of one resistor and a capacitor, some common logic ICs can be transformed from digital to analog duties. This circuit outlines some the features to expect from different inverter ICs.

CIRCUIT FORMS DIVIDE BY 1.5 COUNTER
Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

BangBang Thermostat is Simple and Efficient: 11/06/97 EDN-Design Ideas / (added 10/04) Perhaps simplest and oldest feedback loop is nonproportional, all-or-nothing, "bang-bang" rmostat. Fully turning on a heater when temperature is below setpoint and off when it's above setpoint is a straightforward example of a servomechanism. Yet, elementary and crude as servomechanisms are, examples surround us in virtually every household-room rmostat, clos dryer, oven, and aquarium heater, to name a few. The version in Figure 1 preserves best features of old bang-bang: low cost, simplicity, and efficiency combined with setpoint stability.

Bench Characterization of ADCs Using a Low Cost PC Based Data Acquisition Board: Maxim Application Notes / 633 / Jul-04 (app note added 6/06)

Better Than Bessel Linear Phase Filters for Data Communications: AN56 Linear Technology The pace of world of digital communications is increasing at a tremendous rate. Each day engineer is requested to compact more data in same channel bandwidth with closer channel spacing. This application note discusses some of requirements and techniques for using new LTC1064/1164 and LTC1264-7 filters which were designed specifically for digital communications. The terms "channel bandwidth," "eye diagrams" and "linear phase" filtering are discussed without need for "engineering speak" which permeates many textbook explanations of same subjects.

Big Endian to Little Endian Data Conversion using 3.3V Bus Switches: Pericom Semiconductor Application Brief # 034 (app note added 2/05)

Brain Wave Machine: (electronic circuit added 7/03)

Capacitance type liquid level measurement: (circuit diagram added 2/07)

Casio Datalogger (CapeCanaveral): (schematic / circuit design added 08/05)

Centronics port D/A converters and low-pass filter: (circuit added 1/07)

Centronics Port DA Converters and Lowpass Filter: (electronic diagram added 6/03)

CHANNEL LINK Moving and Shaping Information in Point-To-Point Applications: National Semiconductor Application Note (app note added 2/06)

Closed Loop Control with the LTC1090 Series of Data Acquisition Systems: DN13 Design Notes (Linear Technology) (app note added 1/06)

Collection of Differential to Single-Ended Signal Conditioning Circuits for Use with the LTC2400 a 24-Bit No Latency Δσadc in an SO-8: AN78 Linear Technology This application note describes six low power differential-tosingleended signal conditioning circuits for the LTC2400 No Latency ΔΣTM 24-bit ADC. These circuits offer the customer a number of choices for conditioning differential input signals as low as 5mV to as high as ±2.5V, as well as operation on a single 5V or ±5V supplies. Each circuit description also covers circuit design and implementation techniques that can help preserve the LTC2400's inherently high effective resolution. AN78 concludes with two circuits for digitizing temperature when using an RTD or Type S thermocouple.

Common Data Transmission Parameters and Their Definitions: National Semiconductor Application Note (app note added 2/06)

Complex Data Acquisition System uses Few Components: DN24 Design Notes (Linear Technology) (app note added 1/06)

Component and Measurement Advances Ensure 16-Bit DAC Settling Time: AN74 Linear Technology DAC DC specifications are relatively easy to verify. AC specifications require more sophisticated approaches to produce reliable information. In particular, the settling time of the DAC and its output amplifier is extraordinarily difficult to determine to 16-bit resolution. This application note presents methods for 16-bit DAC settling time measurement and compares results. Appendices discuss oscilloscope overdrive, frequency compensation, circuit and optimization techniques, layout, power stages and a historical perspective of precision DACs.

Convert binary data to BCD in just 92 µsec : 05/21/98 EDN-Design Ideas / (added 2/06) [Note: File contains multiple circuits scroll to find this circuit] The subroutine "FASTBCD" (Listing 1) for 8051 µPs quickly converts 16-bit binary to 24-bit BCD data. The conversion algorithm involves left-shifting bits from the high-order bit of the binary number into the carry bit while left-shifting the carry bits....

Creating Data Logging Applications in Microsoft Excel: Agilent Application Note (added 6/06)

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Data Acquisition / Logging: #-C D-K L-S T-Z