This logic tip latches on pulses. The TTL circuit was suggested by Radio Electronics magazine in August 1977. The power supply must be 5 V.
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...