Double door bell (CB7559E)

Found in an Elektor from the 90's, this double door-bell drive circuit switches a relay by triggering different points.

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LCD Display Module for IoT 2 4 inches 4Duin (COM088E)
September 2016 - It can be obtained from Mouser Electronics modules with 2.4 inch from 4D Systems...
Micro metronome (CB20743E)
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...
Intermittent Tone Generator (CB18955E)
This circuit was found in a European publication from the 1980s. The transistors can be the BC548...