Field intensity meter (CB7365E)

Found in a 1966 publication, this circuit is a simple version of a field strength meter. The diode is a general-purpose germanium type.

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Amplifier for ceramic capsule (CB9059E)
Found in documentation from the 1980s, this amplifier uses an integrated circuit from the time....
Temperature shield TMP390 (CB20397E)
This is a one-channel application for the Texas Instruments TMP390 sensor obtained directly from...
Humidity Relay (CB18619E)
This moisture-activated relay was obtained from an American documentation from the 1980s,...