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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Tuned audio oscillator (CB22254E)
This circuit is from a publication from the 50's. Inductive components are critical, and...
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This simple two-transistor circuit used transistors from the 60s, having been found in a...
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