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Data Logging / Acquisition Circuits Page 1 Data Acquisition / Logging: #-CD-KL-ST-Z Last Updated on:
Monday, April 28, 2008 04:22 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.
DVD Recorder + TV Camera Make Cheap Data Logger
Sometimes recording the results of a test requires as much ingenuity as designing the product. Consider a situation which requires the collection of many different variables over a long period
of time. Perhaps you are conducting temperature cycle tests on an electronic circuit and you want to know what changes occur in circuit performance over a 24 hour period. You could stay up all
night and collect the data yourself....
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
1-Wire Barometer: circuit requires an additional power source or than that of 1-Wire network. MPX4115 requires
about 7 ma of current. This is more than a 1-Wire network can provide without an elaborate circuit to store parasitic power from 1-Wire network for short burst of current for pressure
measurements. Two voltage regulators are used to provide both 5.0 and 10.0 voltages from a source of DC power ranging from 12 to 24 volts. (added 2.07)
A 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 LTC2400 No Latency ΔΣTM 24-bit ADC. These
circuits offer 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 LTC2400's inherently high effective resolution. AN78 concludes with two circuits for
digitizing temperature when using an RTD or Type S rmocouple.
Acquisition system is Programmable on the fly: 10/12/95 EDN-Design Ideas / (added 11/05) The programmable
data-acquisition system in Fig 1 can take 333k samples/sec using a 3-µsec sampling ADC, IC3. Multiplexer IC1 and programmable gain amplifier (PGA) IC2 provide four truly differential channels
and four decade gains of 1, 10, 100, and 1000. These features allow circuit to handle low-signal sensors without additional conditioning circuitry. The circuit does not require an S/H
amplifier due to ADC's sampling structure. If you want to handle noisy and high-speed signals, you may need to add an antialiasing filter in front of ADC. The heart of system
is a 4x4 register file, IC5, which essentially controls ....
ADC to PC interface Transfers data in nibbles : 12/09/99 EDN-Design Ideas / (added 6/06) -The circuit in Figure 1 uses a
Centronics printer port to interface an eight-channel, 8-bit ADC to a PC. The circuit cuts cost of addressing and decoder circuitry and saves one expansion slot for interfacing. The
design uses three of subport...
AN26(A-R) Interfacing the LTC1090/1/2: AN26 Linear Technology A collection of interface applications between various
microprocessors/ controllers and LTC1090 family of data acquisition systems. The note is divided into sections specific to each interface. (app note added 2/06)
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