Post Project 40: Poor man’s logic analyzer

August 22, 2014 | 10:14
Post Project 40: Poor man’s logic analyzer
Post Project 40: Poor man’s logic analyzer
For occasional measurements of digital circuits there is no need to get hold of a real logic analyzer. With the help of several ICs it’s possible to measure the signal levels of 16 channels and to display them simultaneously on a standard oscilloscope. There’s no problem if this is an old-fashioned device with a cathode ray tube, which many hobbyists still use at home.
 
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A modern digital scope usually has the facility to display several digital signals on the screen at the same time. However, on older scopes (those with cathode ray tubes) this feature is often lacking. In that case, you can use the circuit described here, which can display the signal levels of 16 digital channels simultaneously, shown as zeroes and ones on the screen.
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