LCD Thermometer:  (app note added 6/03)

Lie Detector #1:  (electronic circuit added 4/05)

Lie Detector (hackcanada):  (electronic circuit added 7/03)

Lie Detector (hackcanada):  (electronic circuit added 7/03)

Linear Technology Magazine Circuit Collection Volume iii:  AN67 Linear Technology 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 with adjustable gain, and a fully differential, 8-channel, 12-bit A/D system. The categories included in this app note are data conversion, interface, filters, instrumentation, video/op amps and miscellaneous circuits.  (app note added 2/06)

Linear Technology Magazine Circuit Collection Volume V:  AN87 Linear Technology Application Note 87 is the fifth in a series that excerpts useful circuits from Linear Technology 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, interface and hot swap circuits, active RC and switched capacitor filter circuitry and a variety of data conversion and instrumentation circuits. All circuits are conveniently indexed by type.  (app note added 2/06)

Long Transmission Lines and Data Signal Quality:  National Semiconductor Application Note   (app note added 2/06)

LTC1099 Enables PC-Based Data Acquisition Board to Operate DC-20kHz:  AN34 Linear Technology 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 can acquire data at speeds greater than 20kHz. Machines with 80286 and 80386 processors can go faster than 20kHz. The computer that was used as a test bed in this application was an XT running at 4.77MHz and therefore all system timing and acquisition time measurements are based on a 4.77MHz clock speed.

Magnetometer:  (electronic diagram added 6/03)

MAX1407 Complete Data Acquisition System Simplifies Your System Designs:  Maxim Application Notes / 830 / Feb-09  (app note added 6/06)

Measurement and Control Circuit Collection:  AN45 Linear Technology A variety of measurement and control circuits are included in this application note. Eighteen circuits, including ultra low noise amplifiers, current sources, transducer signal conditioners, oscillators, data converters and power supplies are presented. The circuits emphasize precision specifications with relatively simple configurations.  (app note added 2/06)

Minilogger V1.0:  Build your own a personal data logger for recording analog signal. The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL switch or preprogrammed Start/Stop Time. The format of uploading data is ASCIII format, suitable for importing and graphing by Excel or any Scientific Plot Program. Exemplary circuit used for measuring Insolation and Air Temperature vs. Time is included. ...  (added 7/02)

Moving from the HP 3852A Data Acquisition System to the Agilent 34980A Switch / Measure Unit:  Agilent Application Note   (added 6/06)

New 12-Bit Data Acquisition Systems Communicate with Microprocessors over 4 Wires:  DN22  Design Notes (Linear Technology) (app note added 1/06)

New Data Acquisition Systems Communicate with Microprocessors over 4 Wires:  DN1  Design Notes (Linear Technology) (app note added 1/06)

Novel Storage Idea Supports Ultra Fast Data Acquisition:  Maxim Application Notes / 381 / Oct-07)  (app note added 6/06)

One Wire Barometer:  (electronic diagram added 6/03)

Passive Circuit Monitors Aes Data:  02/17/00 EDN-Design Ideas / (added 2/06) 

PC-based ISA data acquisition and control board:  (diagram added 2/07)

PIC16F876 Datalogger:  (circuit / schematic design added 6/06)

Popular Connector Pin Assignments for Data Communication:  National Semiconductor Application Note   (app note added 2/06)

Practical Data Acquisition using a Windows1 based Power Meter :  Maxim Application Notes / 1138 / Feb-08  (app note added 6/06)

Practical Temperature Measurements:  Agilent Application Note   (added 6/06)

Precision Receiver Delay Improves Data Transmission:  DN129  Design Notes (Linear Technology) (app note added 1/06)

Reading Data from the Parallel Port:  (circuit / schematic design added 6/06)

Recognizing and Reducing Data Acquisition Switching Transients:  Agilent Application Note 1444  (added 4/08)

Remote Control:  This is a simple wireless remote control unit, which was originally designed for a model hovercraft which I was developing with the help of my friend Uday Arya. The project has been discontinued for technical reasons, but this remote control unit survives. The method used seems to be quite popular among many remote control units. (added 1/06)

Remote Digital Thermometer Sends Data over AC Power Line:  (circuit / schematic design added 6/06)

RS-232c Handshake Lines Transfer Data Frames:  10/23/97 EDN-Design Ideas  / (added 6/06)   

Selecting Temperature Transducers for Data Acquisition Systems:  Agilent Application Note 1406  (added 4/08)

Selecting the Right Data Acquisition System (AN 1412):  Agilent Application Note 1412  (added 4/08)

Self Made Data Logger :  (electronic diagram added 6/03)

Serial Port A/Dconverter:  (electronic diagram added 6/03)

Serial port temperature datalogger:  (electronic circuit added 2/07)

Simple Lie Detector #1:  (electronic circuit added 4/05)

Simple Lie Detector (hackcanada 2):  (electronic circuit added 7/03)

Square Root Function Improves Thermostat:  09/30/99 EDN-Design Ideas / (added 6/06) Perhaps the most elementary rule of control-loop design theory is that feedback-loop performance is fundamentally linked to the careful choice—and stability—of loop gain. Insufficient loop gain leads to poor setpoint accuracy. Too much gain can induce feedback instabilities, such as overshoot, ringing, and, ultimately, oscillation. Therefore, the greater the accuracy you expect from a control system, the more critical maintaining near-optimal loop gain becomes.