. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. (b) (c) Figure Thermistor delay circuits: (a) slow operate, fast release; (b) fast operate, then after delay, release; {c)fast operate, slow release Counting circuits Relay circuits can be used to 'count down' impulses so that an output is provided only at every second (or third, etc.) input impulse. In this section some of these circuits are described, both for their inherent usefulness and also as examples of relay circuit design. For other examples of scales-of-two, a comprehensiv
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. (b) (c) Figure Thermistor delay circuits: (a) slow operate, fast release; (b) fast operate, then after delay, release; {c)fast operate, slow release Counting circuits Relay circuits can be used to 'count down' impulses so that an output is provided only at every second (or third, etc.) input impulse. In this section some of these circuits are described, both for their inherent usefulness and also as examples of relay circuit design. For other examples of scales-of-two, a comprehensive review of scaling circuits by Barnes^ should be consulted. Figure shows a typical scale-of-two circuit. When the input key L is closed, relay A operates through the make-before-break contact A\; it 527. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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