Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Microsecond to 10 minute timer (CB21412E)
This circuit was found in an old American optoelectronics manual. The circuit makes use of an...
Neon Flasher (CB17307E)
This is a traditional flasher configuration with two neon lamps. The frequency is given by the 100 nF...
Twilight Switch (CB11511E)
This article was obtained in a French magazine Nouvelle Electronique from 1994. It can be easily...