This circuit was found in a 1991 publication. The transistor can be a general-purpose type.
XTAL from 4 to 20 MHz can be used in this oscillator. The XRF choke can range from 10 to 100 µH...
This zero crossing detector is of the 1993 Motorola Linear Interface ICs. The source is...
This conventional slow-moving circuit uses incandescent light bulbs, but can be changed to use...