Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

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Precision Current Drain (CB14077E)
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High Voltage Power Supply (CB1228E)
This source was obtained from a former publication for valves but also serves for powering common...
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The components of this circuit are still common today. The circuit is from a 1967 publication by...