Found in a 1980s American documentation, this circuit has a current consumption of only 1 mA. The crystal can be from 100 kHz up to a few megahertz.
September 2016 - can already be purchased at Mouser Electronics the Robot Scribbler S3 from...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
This simple transistorized game that appears in other versions in this section and website, was...