Phase selector for remote control (CB9265E)

Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an inverted phase using a relay and a unit gain stage.

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Stable optical coupler (CB7410E)
This circuit is from NASA documentation from the 1980s. The circuit shows how to obtain a stable...
Temperature sensor 0 to 50º C degrees (CB10172E)
This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in...
Signal Follower 4001 (CB5890E)
We can also use the 4011 on this CMOS circuit that makes use of a crystal headset. The power...