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Data Acquisition / Data Logging Circuits, Page 9
Data Acquisition / Logging: 
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Last Updated on: Wednesday, November 29, 2017 05:38 AM

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

Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System (DAS) Based on the AD7606 16-Bit, 8-Channel DAS  -  The ADC output code will be influenced by the reference voltage applied to the AD7606 device: , Absolute Accuracy When absolute accuracy of the ADC conversion result, in addition to channel-to-channel and part-to-part matching, is critical, an external tight tolerance low drift reference should be used as the system reference. The difference in the mean output code was 1. 4 codes between V1 channels on different devices. , Channel-to-Channel Matching for 16-Channel System In high channel count systems good channel-to-channel and part-to-part performance matching will help to greatly simplify calibration routines. There is a maximum histogram spread of 7 codes with each channel histogram centered on code 0, as shown in Figure 6. , Figure 4 shows bottom layer decoupling. . .  [Analog Devices-Circuits from the Lab]

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LCD thermometer -  In this page, I introduce the LCD thermometer which is sold by "Akizuki Denshi Tsusho". At this thermometer, the IC thermo sensor (S8100) or the diode (1S1588) is used as the thermo sensor. When using the IC thermo sensor, the thermometry to +100°C from -40°C is pOssible. Also, when using the diode, the measurement to +150°C from -20°C is pOssible. Both sensors are contained in the kit. . . .  [Seiichi Inoue's Web Site]

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LCD thermometer 1 -  Build your own temperature meter for fun. This project uses the Microchip TC77 digital temperature sensor,  a PIC16F871 microcontroller and a 7-segment 3˝ digit LCD. You can study the source code on how to drive an LCD display. . . .  [designed by Peter Jakab]

 

Lie Detector -  The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3) , a capacitor (C1) , two lights or LEDs (L1 & L2) , five resistors (R1 to R5) , and a variable resistor (VR1). This circuit is based on the fact that a person's skin resistance changes when they sweat (sweating because they're lying) . . .  [Name of Designer is not included]

 

Linear Technology Magazine Circuit Collection Volume iii -  AN67 Application Note 67 is a collection of circuits for data conversion, interface and signal processing from the first five years of Linear Technology. This application note includes circuits such as fast video multiplexers for high speed video, an ultraselective bandpass filter circuit. . .  [Linear Technology]

 

Linear Technology Magazine Circuit Collection Volume V -  AN87 Application Note 87 is the fifth in a series that excerpts useful circuits from magazine. Data conversion, interface and signal conditioning circuits from issue VI:1 (February 1996) through issue VIII:4 (November 1998) are featured. Like its predecessor, AN67, this Application Note includes circuits for high speed video, . . .  [Linear Technology]

 

Logging Photodiode JFET Amplifier with 1pA Input Bias Current -  The 1pA input bias current contributes only 0. 4fA/rtHz of current noise or 0. 4nV/rtHz voltage noise with a 1Mohm source impedance. Photodiode current is converted to a voltage by the first op Amp and D1 and Amplified by the first, second and third logarithmic compression Amplifiers. . . .  [Linear Technology App Note - , Mar 22, 2010]

 

Long Transmission Lines & Data Signal Quality -  Application Note. . .  [National Semiconductor]

 

Low cost gyro / accelerometer combo sensor -  In building a balancing robot you need a gyrOscope unit and an accelerometer unit in order to get it to balance. But I also wanted it to be reasonably low in cost with high performance and easily interfaced to a MCU. Some of the other solutions are prohibitively expensive, even if they may work well. Also the solution I had in mind had to be fairly small and use up little space and use up little power too. . .  [ by Earl W. Bollinger]

 

Low cost , 16-Bit, 250 kSPS, 8-Channel, Isolated Data Acquisition System  -  System Performance Figure 4 shows a plot of the ADC code occurrences for 10, 000 samples (1 sec at 1 kSPS) when CH0 through CH7 are shorted to GND on the terminal block of the evaluation board. Note that 95% of the codes fall within 4 LSBs, and the peak-to-peak spread is approximately 7 LSBs. The sampling rate 250 kSPS is controlled by the system demonstration platform ( EVAL-SDP-CB1Z ), and the digital signal processing including the signal windowing and FFT is calculated on a PC by the CN-0254 evaluation software. . .  [Analog Devices-Circuits from the Lab]

 

Low Power, Long Range, ISM Wireless Measuring Node  -  This simplifies the software but necessitates the use of an extra diode and resistor to separate incoming and outgoing data streams. . .  [Analog Devices-Circuits from the Lab]

 

Low-cost Laser Data Links -  Quit shining laser pointers at people and use them for something useful. . . .  [Green Bay Professional Packet Radio]

 

LTC1099 Enables PC-Based Data Acquisition Board to Operate DC-20kHz -  AN34 A complete design for a data acquisition card for the IBM PC is detailed in this application note. Additionally, C language code is provided to allow sampling of data at speed of more than 20kHz. The speed limitation is strictly based on the execution speed of the "C" data acquisition loop. A "Turbo" XT (App Note - add 1/06) . . .  [Linear Technology]

 

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