Micro siren (CB21234E)

This circuit with the LM3909 can be powered with voltages from 3 to 5 V. We found it in a Popular Electronics from the 90s.

Code Switch (CB26086E)
We found this code switch circuit in the January 1999 Electronics Now magazine. Some of the...
LDC2114EVM Inductive Touch Evaluation Module (COM165E)
January 2017 - Now available on Mouser Electronics, Texas Instruments' new LDC2114EVM Evaluation Module...
Constant Current Generator CA3018 (CB24065E)
This circuit with a CA3018 from RCA at the time was found in the August 1970 issue of Radio...