Circuit - Data Logging / Acquisition Electronic Circuits Designed by David A. Johnson, P.E.

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Data Logging / Acquisition Circuits
Designed by David A. Johnson, P.E.
Last Updated on: Tuesday, October 13, 2009 01:26 PM

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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....

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