. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. RELAY CIRCUITS Even with 'capacitance slugging', delays of much more than ten seconds are not possible. By using thermally sensitive resistors delays of up to a minute or so may be obtained. The duration of the delay will not, however, be accurate, but will depend on ambient temperature. In addition, an ade- quate time must be left between operations for the thermal element to revert r T r (a) IT (b) Figure Capacitance delay circuits: (a) single coil relay; (6) twin coil relay to roo
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. RELAY CIRCUITS Even with 'capacitance slugging', delays of much more than ten seconds are not possible. By using thermally sensitive resistors delays of up to a minute or so may be obtained. The duration of the delay will not, however, be accurate, but will depend on ambient temperature. In addition, an ade- quate time must be left between operations for the thermal element to revert r T r (a) IT (b) Figure Capacitance delay circuits: (a) single coil relay; (6) twin coil relay to room temperature. Figure shows a group of circuits using the large and cheap thermistor elements of the type used as current limiters ( Brimistors). L (a). 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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