This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
Interval pulses emitted by this circuit are picked up in a medium wave radio nearby. The circuit is...
Alorium Tech XLR8 Application Accelerator & Development Board is an Arduino-compatible board that...
This different astable configuration was found in one in a 1974 Ferranti transistor manual....