This reader with TTL logic compatible output uses an LM139 comparator. The circuit was found in the 1994 National Semiconductor Linear Applications Handbook.
This circuit was found in a 90s Radio Electronics. It is intended to amplify the sound channel of...
This circuit is based on an operational window comparator. We found it in a documentation from the...
This circuit is suggested by Motorola as the basis for the MC3324 A integrated circuit and has a...