Abstract

The digitizer described has been used extensively in our spectrometric laboratory over the past 3 years. It was mostly used in conjunction with 5-V TTL-equipped counters and associated logic in homebased spectrophotometers, airborne airglow photometers, and antarctic-based auroral photometers. To form an organic unit with these systems it was designed to operate from the stabilized 5-V supply of these systems. Fig. 1 shows the circuit employed, which operates as follows.

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