This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
September 2016 - can already be purchased at Mouser Electronics the Robot Scribbler S3 from...
This circuit is suggested by General Electric in 1966 documentation. The Triac must match the...
This circuit was found in Radio Electronics from the 90s. The circuit employs a transconductance device and...