Buffered Detector (CB6669E)

This circuit was found in 1967 General Electric documentation. The transistors of the time can be replaced by modern equivalents.

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DC Voltmeter with CA3140 (CB21718E)
We found this circuit in an internet documentation. The circuit uses a 1 mA instrument, and the...
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Electronic Thermometer (CB18201E)
This circuit is from 1985 documentation. The integrated circuit used is not very common today, but...